Jul 7 – 12, 2024
The ‘Gabriele d’Annunzio’ University, ICRANet and Aurum
Europe/Rome timezone

Confirmed Parallel Sessions

  • Accretion (AC)

    • Spectral and temporal properties of accretion flows and jets around compact objects and the theoretical models

      AC1

      Chairperson: Banibrata Mukhopadhyay
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      This session brings together all the scientists who are interested in relativistic astrophysics around galactic, extra-galactic and intermediate mass black holes, as well other compact objects. We welcome papers on the following topics and other from related topics:
      1. Theory of accretion disks, outflows and jets and underlying magneto-hydrodynamic (MHD)
      2. Emission processes from the disks and jets, including that of gravitational waves
      3. Polarization properties of radiations from disks and jets
      4. Fitting of satellite data by theoretical models
      5. Evidences for disk-jet connections
      6. General relativistic MHD (GRMHD), or otherwise as appropriate, simulations of flows in curved spacetime (e.g. black hole) geometry.

  • Artificial Intelligence Methods (AI)

    • Cosmic Insights from Big Data: How Machine Learning is Decoding the Universe

      AI1

      Chairpersons: Giuseppe Angora and Lorenzo Bazzanini
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      Machine learning (ML) and deep learning (DL) applications in astrophysics have gained enormous momentum in the last few years. Indeed, the exponential growth of astronomical data, thanks to the advancements of observational technologies, has demanded the development of intelligent tools for efficient data handling and extraction of new insights from these vast datasets. ML/DL techniques aim to identify and learn from patterns in data, thereby enhancing simulations and aiding in the understanding of complex phenomena, paving the way for novel discoveries. These techniques have found extensive applications in various domains, including galaxy classification, characterization of galaxy and stellar properties, simulation of large-scale cosmic structures, testing cosmological paradigms, detection of transient events, identification of gravitational lensing effects, and cosmic microwave background inpainting. As the field continues to evolve, interdisciplinary collaboration between astronomers and ML/DL experts will play a crucial role in harnessing the full potential of these techniques to advance our understanding of the universe. This session will delve into these applications and explore the prospects of ML/DL in astrophysics.

  • Alternative Theories (AT)

    • Wormholes, energy conditions and time machines

      AT1

      Chairperson: Francisco Lobo
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      The General Theory of Relativity has been an extremely successful theory, with a well established experimental footing, at least for weak gravitational fields. Its predictions range from the existence of black holes, gravitational radiation to the cosmological models, predicting a primordial beginning, namely the big-bang. All these solutions have been obtained by first considering a plausible distribution of matter, and through the Einstein field equation, the spacetime metric of the geometry is determined. However, one may solve the Einstein field equation in the reverse direction, namely, one first considers an interesting and exotic spacetime metric, then finds the matter source responsible for the respective geometry. In this manner, it was found that some of these solutions possess a peculiar property, namely 'exotic matter,' involving a stress-energy tensor that violates the null energy condition. These geometries also allow closed timelike curves, with the respective causality violations. These solutions are primarily useful as 'gedanken-experiments' and as a theoretician's probe of the foundations of general relativity, and include traversable wormholes and superluminal 'warp drive' spacetimes. In this parallel session, in addition to extensively exploring interesting features, in particular, the physical properties and characteristics of these 'exotic spacetimes,' we also explore other non-trivial general relativistic geometries that generate closed timelike curves.

    • Theories of gravity: alternatives to the cosmological and particle standard models

      AT2

      Chairperson: Orlando Luongo, Hernando Quevedo and Francesco Pace
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      In the standard model of cosmology, the ΛCDM model based on Einstein’s General Relativity, dark energy is introduced completely ad hoc in order to explain the present acceleration of the universe. The model requires also the introduction of dark matter dominating (by far) ordinary baryonic matter but yet undetected in the laboratory, and it suffers from astrophysical problems. Modifying gravity is a possible alternative, and many such proposals have been presented in recent years. Likewise, the standard model of particle physics is unable to incorporate all the current particle phenomenology and proposed dark matter candidates.
      Cosmology and particle physics come together in the early universe and, surprisingly, also in theories and models of the present, accelerating universe. This session is formulated in a wide framework to include several topics related to these problems, and spanning alternative theories of gravity and cosmology, alternatives to the ΛCDM model, quantum field theory applied to gravity, extensions of the standard model of particle physics, and dark energy and dark matter from a particle physics point of view. This session represents the interplay between, and the efforts to match, particle physics and cosmology, giving particular emphasis to the role played by particle quantum field theory in the early and the late universe.

  • Black Holes: Classical and Beyond (BH)

    • Gravitational instantons and black holes

      BH1

      Chairperson: Reinoud Slagter
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      This parallel session covers instanton solutions on pseudo-Riemannian and Riemannian spacetime. These solutions originate from quantum field theory on Euclidean space, e.g. from Yang-Mills gauge theories. Their connections/curvatures are self-dual. In gravity, there are a handful of exact solutions. They have vanishing classical action and nontrivial topological invariant. The relation to quantum gravity is then easy. One can also relate these solutions to (primordial) black holes. After the discovery of black holes in the very early stages of the universe, the question arises as to how they came into being. Probably by an instanton. On the other hand, when a black hole evaporates completely, what is left behind? Related subjects: Kähler manifold, complex manifolds, symplectic structure, n-instanton moduli spaces.

    • Black holes in alternative theories of gravity

      BH2

      Chairperson: Jutta Kunz and Jose Luis Blázquez-Salcedo
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      Black holes are excellent probes to study strong gravitational fields and thus to test Einstein's theory of general relativity and its contenders by comparing their predictions with observations. Alternative theories of gravity may lead to distinctive features for black holes, which include their multipoles, quasi-normal modes or shadows.

  • Compact Objects and Stellar Evolution (CO)

    • Galactic and extragalactic magnetars: recent observations and theoretical progress

      CO1

      Chairperson: Sandro Mereghetti and Simone Dall’Osso
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      Magnetars, neutron stars powered mainly by their own magnetic energy, host the strongest magnetic fields in the Universe. Besides being unique laboratories to test physical theories in the strong field regime, their energetic outbursts on different timescales and the extreme properties of their birth events makes them relevant in diverse astrophysical contexts. Recent progress in this field has also been driven by the recognition of an expanding number of giant flares from magnetars outside the Local Group.
      This parallel session will focus on the most recent observational results on Galactic and extraGalactic magnetars, as well as on the theoretical developments on their structure, formation and connections with other astrophysical phenomena (such as, e.g., fast radio bursts, gamma-ray bursts, super luminous supernovae, sources of high-energy cosmic rays, neutrinos and gravitational waves).

    • Massive white dwarfs and related phenomena

      CO2

      Chairpersons: Jaziel Goulart Coelho, Banibrata Mukhopadhyay and Jose Domingo Albanil
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      This session brings together all the scientists who are interested in
      white dwarf (WD) physics and astrophysics, particularly the massive WDs,
      and related topics including type Ia supernova and its progenitor.
      We welcome papers on the following topics and other from related topics:
      1. Theoretical and observational progress in WDs
      2. Very fast rotating and/or magnetized, massive WD
      3. Double WD mergers
      4. Importance and possible identification of strong magnetic fields in WDs
      5. Chandrasekhar limit and WD mass-radius relation, and their possible
      theoretical and observational violation
      6. Tidal deformability in WD
      7. Nuclear processes in evolution of main sequence stars evolving to WD
      8. Type Ia supernova progenitor
      9. Explosive events as bursts, Fast Radio Bursts (FRBs)
      10. Magnetic CVs including polar and intermediate polar
      11. Gravitational waves from WD systems and their future detection

    • Bosonic dark matter and/in neutron stars

      CO3

      Chairpersons: Soroush Shakeri and Davood Rafiei Karkevandi
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      Among different Dark Matter (DM) candidates the scalar or pseudoscalar bosons are of great interest from various aspects in astrophysics and cosmology. Generally, bosonic DM could form gravitationally stable configurations or be substantially accumulated in compact objects such as Neutron Stars (NSs) through different scenarios. In this regard, the advent of multi-messenger observations via gravitational and electromagnetic waves provide a unique opportunity to probe the existence of dense astrophysical objects made entirely or fractionally by bosonic DM.
      In this section, we will focus on both theoretical and observational aspects of boson stars, fermion-boson stars, DM admixed NSs and other exotic type of compact stars. Recently, the GW detections by LIGO-Virgo-KAGRA and X-ray observations by NICER telescopes have opened a new window towards understanding the structure of compact objects and may shed light on the nature of DM through exploring exotic results.

  • Cosmic Microwave Background, Cosmological Tensions (CM)

    • Cosmic backgrounds from radio to far-IR

      CM1

      Chairpersons: Carlo Burigana and Tiziana Trombetti
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      This parallel session will focus on the interpretation and perspectives for cosmology and astrophysics coming from cosmic backgrounds from radio to far-IR, both in temperature and in polarization. Following past CMB projects and the latest results from the Planck mission, sub-orbital experiments are improving our understanding of small scale anisotropies and searching for primordial gravitational waves, while future CMB missions of different scales are in preparation or under study. The sub-mm / far-IR domain, crucial for high-frequency foreground mitigation, allows to study a number of astrophysical cosmology topics, including the early stages of star and galaxy formation. In parallel, on-going and future radio projects promise to shed light on the dawn age and on the reionization epoch and to provide 3D images of the Universe's evolution. The authors of both invited and contributed talks are encouraged to underline the connection between astrophysical and cosmological results.

    • Current Status of the H_0 and growth tensions: theoretical models and model-independent constraints

      CM2

      Chairpersons: Joan Solà Peracaula and Adrià Gómez-Valent
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      The era of high-precision cosmology has brought to the very forefront of our field a number of persistent discrepancies between observational data sets and the predictions of the standard model of cosmology, also known as the LCDM model. This situation has generated a lot of debate about whether the standard model is entering a crisis, maybe requiring some modifications or even a new theoretical paradigm, or whether the cosmological measurements are affected by unsuspected systematic errors. This session at MG17 will focus on the current status of these tensions both from the observational as well as from the theoretical point of view. Specifically, there will be talks addressing the following salient topics, among others:
      (i) The direct and inverse cosmic distance ladders, their significance in determining the Hubble tension, methods for constructing them robustly, and potential sources of systematic errors.
      (ii) Measurements of large-scale structure through galaxy clustering and weak lensing, and the implications for the growth tension.
      (iii) Theoretical models beyond LCDM aimed at resolving these tensions.
      (iv) Techniques for extracting model-independent information from cosmological data.

  • Cosmic Rays and Very High Energy Emission (CR)

  • Dark Energy and Large Scale Structure (DE)

    • Large scale structure and dark energy

      DE1

      Chairperson: Clément Stahl
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      This session will delve into the formation of cosmic structures, from the inflationary period to the Universe's late accelerating phase. We welcome contributions from both theorists, simulators, and observers to discuss the latest results of the field, particularly in light of the observations from eBOSS, DES, DESI, Euclid, LSST. We will explore the impact of different theoretical models on structure formation in the non-linear regime, with a focus on dark energy models, modified gravity, and relativistic corrections to Newtonian dynamics. Additionally, we'll discuss the effects of inhomogeneous cosmological models on relativistic cosmology and their implications for the universe's global properties.

    • Dark Energy and the accelerating universe

      DE2

      Chairperson: David Polarski
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      This parallel session will be devoted to the study of the nature and the physical properties of Dark Energy producing the observed accelerated expansion of the present Universe. It will cover the phenomenological reconstruction of dark energy properties from observations, as well as consideration of a wide variety of theoretical models and approaches aimed to explain existing observational data, including modified gravity models, interacting dark energy and other extensions.

  • Dark Matter (DM)

    • Dark matter detection

      DM1

      Chaipersons: Hong-Jian He, Qian Yue and Qiang Yuan
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      Dark matter detection has been an exciting frontier over the past twenty years. Particle physicists and astrophysicists are probing wide mass ranges to hunt for different dark matter (DM) candidates. In this parallel session, the speakers are welcome to present the experimental and theoretical works on both direct and indirect DM detection as well as the collider detection of DM, including such as WIMP candidates and beyond.

    • First stars and their remnants as dark matter probes

      DM2

      Chaiperson: Cosmin Ilie
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      JWST observations of the earliest luminous structures in the Universe are beginning to challenge the standard models of the formation and evolution of the first stars and galaxies. Namely, they imply that a large fraction of the first galaxies ever assembled converted gas to stars at an incredible, almost 100% efficiency. Moreover, the most distant quasars observed are powered by black holes that are unlikely to have been seeded by Population III stars, and, instead, imply the existence of very massive Black Hole seeds at high redshifts. A possible solution to both of those puzzles are stars formed out of zero metallicity gas clouds at the center of high redshift Dark Matter halos and powered by Dark Matter, i.e. Dark Stars. The main over-arching question addressed by talks in this parallel session is: what can we learn about the nature of Dark Matter from observations of the first stars, their BH remnants, and the first galaxies in the Universe.

    • Dark matter halos: its nature, modeling & tracers

      DM3

      Chairperson: Carlos Argüelles
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      Actual attempts to explain the formation of DM halos and its final quasi-universal density profiles are mainly centered in N-body simulations. Despite its success in providing a fitting formula or law for the virialized distributions composed by collisionless particles, we still lack a clear understanding on both, its physical basis and in the very nature of the dark matter candidates. This session is devoted to different aspects of dark matter halos: (i) its modeling either from first principle physics or simulations; (ii) its nature either in terms of bosonic of fermionic particles; (iii) morphology constraints & tracers such as rotation curves or stellar streams among others.

    • Mineral detection of dark matter and neutrinos

      DM4

      Chairpersons: Patrick Stengel and Alexey Elykov
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      Nuclear recoils caused by interactions of Dark Matter or neutrinos can leave latent damage in the crystal structure of minerals. These damage features can be read out using a variety of modern microscopy techniques, ranging from optical (fluorescence) microscopy to techniques with sub-nm spatial resolution such as transmission electron microscopy. Using the damage features accumulated over 10 Myr--1 Gyr in natural mineral samples, one could measure astrophysical neutrino fluxes or search for a variety of Dark Matter candidates. Using signals accumulated over months to few-years timescales in laboratory-manufactured minerals, one could measure reactor neutrinos or use minerals as Dark Matter detectors, potentially with directional sensitivity. This parallel session will summarize some of the latest experimental and theoretical progress towards unlocking the potential of minerals as passive recorders of nuclear recoils.

  • Early Universe (EU)

    • Inflation: perturbations, initial singularities and emergent universes

      EU1

      Chairpersons: Eduardo Guendelman and Stefano Ansoldi
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      In this parallel session, we will have talks that consider inflationary models of all kinds and their relation to observables, reheating, production of primordial black holes, string theory ideas concerning perturbations and quintessential inflation. We will review also issues concerning the existence of initial singularities in the context of inflationary universes. Interesting theorems have been shown by Borde, Guth and Vilenkin indicating the existence of an initial singularity for the inflationary scenarios. The Emergent Universe, first proposed by George F. R. Ellis and Roy Maartens appeared then as an important exception to such theorem. This simple version of the Emergent Universe is unstable, but more developed versions seem stable, both classically and quantum mechanically. A consistent Emergent Universe could be more constrained and therefore more predictive, even on issues like the cosmological constant and others.

  • Experimental Gravitation (EG)

    • Experimental graviation

      EG1

      Chairpersons: Claus Lämmerzahl and Hansjoerg Dittus
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      General Relativity is still the best tested fundamental theory of
      physics. This theory determines our understanding of space and time.
      Nevertheless, there are a series of inconsistencies and so far
      unexplained phenomena with respect to quantum theories that it is
      mandatory to test and to explore General Relativity as hard as possible.
      This session is about testing the foundations as encoded in the Newton
      axioms and in the Einstein Equivalence Principle as well as about the
      consequences of General Relativity for laboratory and space tests. The
      session addresses classical as well as quantum tests.

    • Gravitational lensing, shadows and photon rings

      EG2

      Chairpersons: Volker Perlick and Oleg Tsupko
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      This session is devoted to gravitational lensing, shadows and photon rings. Emphasis is expected to be on analytical and numerical studies. In particular, we will discuss the shadows of black holes and other compact objects, higher-order images produced by lensing and the influence of a plasma on lensing effects. Talks on other aspects of light propagation in gravitational fields are welcome as well.

  • Fast Radio Bursts (FB)

    • Fast radio bursts

      FB1

      Chairpersons: Maura Pilia and Paolo Esposito
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      Fast Radio Bursts (FRBs) are short-duration (~ms) high-fluence (~Jy) radio-only events of extragalactic origin, some of which have been observed to repeat on various timescales. FRB durations define a characteristic length scale for their engine that points towards a compact object as a progenitor. The combination of high luminosity and short variability timescale of FRBs leads to extremely high brightness temperatures (of order 1036 K) which demands for a coherent emission process. The detection of 20200428, an FRB-like event produced by the Galactic magnetar SGR J1935+2154 strengthened the connection between FRBs and magnetars and it showed an X-ray counterpart to the radio emission in the form of a simultaneous burst.
      This parallel session welcomes contributions on the many open questions regarding FRBs such as their progenitors, their connection with magnetars, the presence of one or more classes of FRBs.

  • Gamma-Ray Bursts (GB)

    • Gamma ray bursts relationships in multi-wavenths as cosmological tools

      GB1

      Chairperson: Maria Giovanna Dainotti
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      Gamma Ray Bursts (GRBs) are fascinating events due to the fact that they are observed at very large redshifts, up to redshift 9. Thus, in principle they can be excellent probes of star formation, to track the evolution history of the universe and to be useful for deriving cosmological parameters.
      The problem is that GRBs do not seem to be standard candles with their energetic and luminosities spanning over several orders of magnitude.
      Thus, the hunt for reliable relationships in multi-wavenths is the step necessary to use them as cosmological tools.
      In this sessions we will investigate the current open problems and to which extent selection biases and cosmological evolution affects the application of GRBs as standard candles.
      We will also discuss how much these probes can be used together with SNe Ia and other high redshift probes as quasars and what are the best method for calibrations.

    • Emission mechanisms in gamma-ray bursts

      GB2

      Chairpersons: Gregory Vereshchagin and Damien Bégué
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      We will discuss basic radiation mechanisms producing observed spectra and light curves of gamma-ray bursts and their respective roles. Special attention will be given to theoretical and observational results aiming at discrimination between these mechanisms, in particular synchrotron and photospheric emission. In addition radiation mechanisms of high energy emission observed recently by the ground based Cherenkov detectors such as MAGIC and HESS as well as Air Shower Observatories such as LHAASO will be discussed.

    • The SVOM mission in the time-domain era

      GB3

      Chairperson: Maria Grazia Bernardini
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      SVOM (Space-based multi-band astronomical Variable Objects Monitor) is a Sino-French mission dedicated to the study of Gamma-Ray Bursts (GRBs), scheduled for launch in June 2024. Thanks to the synergy among 4 instruments in space and telescopes on ground, it is capable to detect and localize GRBs and to follow their evolution from the MeV and X-rays to the visible and NIR bands. The SVOM instrumentation, primarily designed for GRB studies, composes a unique multi-frequency observatory with rapid slew capability that will find multiple applications to study extra-galactic and galactic transient phenomena, and to the search and characterization of the electromagnetic counterparts of gravitational wave emitters. In this session we will present the main characteristics of the SVOM mission and the new science windows that it is going to open. We welcome as contributions new ideas of how to exploit the mission's capabilities for GRBs and transients from both an observational and theoretical point of view.

  • Gravitational Waves (GW)

    • Astrophysics with gravitational waves

      GW1

      Chairperson: Jose Fernando Rodriguez-Ruiz
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      This parallel session will be devoted to the use of gravitational waves for the study and identification of astrophysical sources such as binary compact objects like double white dwarfs, binary neutron stars, and binary black holes, among others. This covers the relation between gravitational radiation and other forms of radiation (electromagnetic and neutrino emission). Additionally, multiwavelength gravitational wave astronomy will be discussed, focusing on the joint observations from space and ground-based interferometers. Finally, this session will also include the most recent advancements in observational and theoretical studies on how gravitational wave-optics effects at astrophysical scales can be used to identify halos and other types of structures.

    • Micro-Hertz gravitational waves (0.1-100 μHz): sources and detection methods

      GW2

      Chairpersons: Wei-Tou Ni and Gang Wang
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      The micro-Hz GW (Gravitational Wave) band, ranging from 0.1 to 100 μHz, occupies a crucial intermediate gap between the PTA (Pulsar Timing Array) GW detection band (0.03—100 nHz) and the sensitive bands of space missions like LISA/Taiji/TianQin (0.1 mHz—1 Hz). This frequency range is abundant with potential GW sources. The primary scientific objectives within this band include the detection of GWs from supermassive BH (Black Hole) binary inspiral and coalescence events spanning masses of 105-1010 solar masses, as well as GWs emitted during the inspiral phase of intermediate-mass BH coalescence and intermediate BH binaries falling into supermassive BHs. Detection micro-Hz GWs will provide opportunities to study the BH co-evolution with the galaxies, to test general relativity and beyond-the Standard-Model theories, to explore the micro-Hz stochastic GW background and so on. Several detection proposals under study, including ASTROD-GW, Folkner’s mission, LISAmax, Super-ASTROD, μAries, optical clock missions, and AI (Atomic Interferometry) missions. We solicit new ideas and progress papers together with multi-band and multi-messenger papers for this parallel session.

    • Mid-frequency gravitational waves (0.1-10 Hz): sources and detection methods

      GW3

      Chairpersons: Youjun Lu and Wei-Tou Ni
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      The mid-frequency GW (Gravitational Wave) band (0.1-10 Hz) between the LIGO-Virgo-KAGRA detection band and LISA-TAIJI/TIANQIN detection band is rich in GW sources. In addition to the intermediate BH (Black Hole) Binary coalescence, GWs can also come from the inspiral phase of stellar-mass coalescence and from compact binaries falling into intermediate BHs. Detecting mid-frequency GWs enables us to study the compact object population, to test general relativity and beyond-the Standard-Model theories, to explore the stochastic GW background and so on. In addition to DECIGO and BBO, the detection proposals under study include AEDGE, AIGSO, AION, AMIGO, B-DECIGO, DO, ELGAR, GLOC, INO, LGWA, MAGIS, MIGA, SOGRO, TIAGO, TOBA, ZAIGA, etc. Great advances have accumulated since MG16. We solicit progress papers and new ideas for this parallel session.

  • High-precision astrometry (HP)

    • The situation of the Galactic center

      HP1

      Chairperson: Eduar Antonio Becerra Vergara
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      The nature of the compact object that hosts the center of our Galaxy remains a mystery and one of the hottest topics in recent years. This parallel session will be devoted to reporting advances in theoretical and observational work focused on unraveling the nature of Sagittarius A. Topics of interest include, but are not limited to, stellar orbits, redshift analysis, precession phenomena, shadows and gravitational lensing effects, matter accretion processes, energetic outflows and high-energy emissions, strong magnetic fields and any other physical phenomena that provide hints about the Sagittarius A nature.

  • Multimessenger Astrophysics (MA)

    • Multi-messenger astronomy with gravitational waves

      MA1

      Chairperson: Shu-Xu Yi
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      The advent of gravitational wave astronomy has heralded a new era in multi-messenger astrophysics, offering unprecedented insights into the cosmos through the synergistic analysis of gravitational waves, electromagnetic signals, and other cosmic messengers. This collaborative approach has not only enhanced our understanding of some of the universe's most enigmatic phenomena, such as binary neutron star collisions, but has also paved new pathways for exploring the fundamental laws of physics and the nature of the Universe itself.
      This session welcomes presentations that utilize joint observations with gravitational waves and other astronomical messengers as probes into fundamental physics, cosmology, and astrophysics. Furthermore, we invite contributors to share works that offer software tools designed for simulating, analyzing, or aiding in the joint observation of gravitational waves and other messengers.

    • New frontier of multi messenger astrophysics: follow up of electromagnetic transient counterpart of gravitational wave sources

      MA2

      Chairpersons: Fabio Ragosta and Silvia Piranomonte
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      The first detection of an EM counterpart of a GW detection creates a possibility for a new way of thinking the astronomy, multi-messenger observations of GW170817 helped us construct a more comprehensive picture of compact binary mergers in an astrophysical context; and it has even enabled us to put significant constraints on topics of broad interest in physics from the neutron star equation of state to the expansion rate of the Universe. However, the expected counterpart from the neutron star-black hole system hasn’t been found yet. Furthermore, the most recent observing runs of the IGWN didn’t show any GW detection with a visible EM counterpart. This session aims to explore the lessons learned from the observed counterpart and the non-observation and to prepare the community for future detection.

    • Repeating transients in galactic nuclei: confronting observations with theory

      MA3

      Chairpersons: Francesco Tombesi and Petra Sukova
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      In the last few years, a mysterious new class of astrophysical objects have been uncovered. These are spatially coincident with centers of external galaxies and show X-ray variations that repeat on timescales of minutes to a month. They manifest in three different ways in the data: stable quasi-periodic oscillation (QPOs), quasi-periodic eruptions (QPEs) and quasi-periodic outflows (QPOuts). QPOs are systems that show smooth recurrent X-ray brightness variations while QPEs are sudden changes that appear like eruptions. QPOuts represent systems that exhibit repeating outflows moving at mildly-relativistic velocities of (0.1-0.3)c, here c is the speed of light. Their underlying physical mechanism is a topic of heated debate, with most models proposing that they originate either from instabilities within the inner accretion flow or from orbiting objects. There is a huge excitement especially from the latter class of models as it has been argued that some repeating systems could host extreme mass ratio inspirals potentially detectable with upcoming space-based gravitational wave interferometers. Consequently, paving the path for an era of “persistent” multi-messenger astronomy.

  • Neutrinos (NU)

    • ANTARES – 15 years of multi-messenger astronomy in the sea

      NU1

      Chairpersons: Luigi Antonio Fusco and Agustín Sanchez Losa
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      The ANTARES neutrino telescope took data for 15 years in the Mediterranean Sea, from 2007 to 2022, and collected a high-purity all-flavour neutrino sample. The final analyses of this sample have been carried out, in the search for neutrino signals in many channels: individual sources, either steady or flaring, also including the information from electromagnetic observations, galactic signals, all-sky diffuse emissions, various searches in the multi-messenger context, but also studies of neutrino properties and searches for physics beyond the standard model. This session collects an overview of such searches and enlightens the future perspectives for neutrino telescopes in the Mediterranean Sea.

    • Unveiling neutrino secrets through cosmology: current status and future developments

      NU2

      Chairpersons: Massimiliano Lattanzi, Martina Gerbino, Luca Caloni and Nicola Barbieri
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      In the past few years, precision cosmology has emerged as a powerful tool to investigate neutrino properties and interactions, providing complementary information to laboratory experiments with unprecedented sensitivity. From the impact on the abundance of primordial elements to the signatures left on the anisotropies of the Cosmic Microwave Background and the subsequent clustering dynamics, neutrinos exert a diverse range of effects on cosmological observables thanks to their rich phenomenology.
      Several fundamental questions are still left without an answer, including the origin and hierarchy of neutrino masses, their Dirac or Majorana nature, and the presence of additional neutrino species. This session will explore all these fundamental aspects of neutrino physics, by exploiting the interplay between cosmological observations and laboratory experiments. We will outline current constraints, discuss future prospects, and explore novel techniques to deepen our knowledge of neutrino properties.

  • Quantum Gravity (QG)

    • Loop quantum gravity: cosmology and black holes

      QG1

      Chairpersons: Jorge Pullin and Parampreet Singh
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      Session on loop quantum gravity concentrating on developments in black holes and cosmologies.

    • Loop quantum gravity

      QG2

      Chairpersons: Jerzy Lewandowski and Cong Zhang
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      One of the most challenging topics in modern physics is how to unify quantum mechanics and general relativity. Loop quantum gravity is a background independent and non-perturbative approach to tackle this challenge. This session is a comprehensive exploration of all facets of the full theory of loop quantum gravity. We encourage presentations on recent developments in canonical loop quantum gravity, spin foam models, group field theory and other related approaches to quantum gravity. Central to our discussions is the concept of background-independent quantization of various theories of gravity and the emergence of quantum geometry.

    • Causal set theory and causal dynamical triangulations

      QG3

      Chairperson: Yasaman Yazdi
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      If, as many believe will be the case, we are to have a theory of quantum gravity, then one primary question is: what is the structure of a "quantum spacetime"? i.e. what does spacetime look like at microscopic scales near the Planck scale and what would a gravitational path integral yield, in such a theory of quantum gravity? Causal set theory and causal dynamical triangulations are two approaches to quantum gravity that embrace these questions in a nonperturbative and causal manner. In causal set theory the underlying structure of a macroscopic continuum spacetime is proposed to be a fundamentally discrete spacetime with nothing in between the elements and with causal relations between some of the elements. In causal dynamical triangulations, spacetime emerges from path integrals over geometries composed of flat simplices causally glued together, where the sizes of these simplices are ultimately taken to zero.
      This session will present a status report of these approaches as well as discuss recent advances in them in the areas of cosmology, quantum field theory, dynamics and the emergence of spacetime.

    • Quantum gravity phenomenology

      QG4

      Chairperson: Giovanni Amelino-Camelia and Giulia Gubitosi
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      This session will be devoted to discussion of phenomenological models aimed at probing and possibly leading to detection of various phenomena of quantum gravity origin. Such models are particularly timely now, at the down of the multi-messenger astronomy, which give us an access to new observations, possibly capable of detecting Planck-scale effects. The aim of the session will be to present recent developments in both theoretical investigations and current and near-future observational opportunities.

  • Strong Fields (SF)

    • Strong electromagnetic and gravitational field physics: From laboratories to early Universe

      SF1

      Chairpersons: Sang Pyo Kim and She-Sheng Xue and Ehsan Bavarsad
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      Strong electromagnetic and gravitational fields play important roles in physics, particularly in astrophysics and cosmology. Strong electromagnetic and gravitational fields are two of the most important ingredients of the compact objects and the early universe. This session is dedicated to all theoretical aspects of high field and/or energetic phenomena due to strong electromagnetic fields and/or gravity in Earth-based laboratories as well as astrophysics and cosmology, such as Schwinger pair creation in Minkowski spacetime and curved spacetimes, Gibbons-Hawking radiation, backreaction effects, magnetogenesis, charged particle acceleration, vacuum polarization, and nonlinearity of strong electromagnetic fields. It is also dedicated to experimental and theoretical aspects of laboratory astrophysics and astrophysical observations related to strong field physics, such as intense lasers plasma acceleration, plasma interaction with strong electromagnetic fields, radiation from accelerating charges, observation of birefringence in neutron stars, simulation of strong gravity effects etc.

  • Theory and Experiments in Fundamental Physics

    • Extended theories of electromagnetism and their impact on laboratory experiments and astropyhisical observations

      TF1

      Chairpersons: Claus Lämmerzahl and Alessandro Spallicci
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      Despite the detection of neutrinos, cosmic rays and recently gravitational waves, astronomy is largely based on electromagnetic signals, still interpreted with 19th century Maxwellian linear electromagnetism. But the latter might not be the right tool to interpret any electromagnetic phenomenon. For example, in the presence of strong fields or at extreme scales, Maxwellian electromagnetism may fail and become part of a larger theory, as Newtonian gravity is an approximation of the highly non-linear Einsteinian gravity. Meanwhile, inexplicable observations about the universe are prompting cosmologists to propose either new ingredients like dark matter and dark energy, as part of a complex multi-parametric concordance model, holding to general relativity. This approach leads to 96% of the universe being constituted by dark components experimentally undetected and not foreseen by the Standard Model (SM). Others, unconvinced of filling observations with enormous quantities of ad hoc ingredients, propose new theories of gravitation. Unfortunately, for this option, general relativity consistently records successes. Faced with this dichotomy and the respective pitfalls, a third (complementary) option is the study of the nature of the messenger: light. The photon is the only free massless particlle in the SM, and waves emerge from a 19th century linear theory. Could a different interpretation of light lead to a less troublesome interpretation of the universe? Which are the implications for gravity? Experiment oriented talks are welcome.