Conveners
Dark Matter: Beyond LCDM: Block 1
- Andreas Krut ()
- Carlos Raúl Argüelles (Universidad Nacional de La Plata)
Dark Matter: Beyond LCDM: Block 2
- Andreas Krut ()
- Carlos Raúl Argüelles (Universidad Nacional de La Plata)
Description
This parallel session is devoted to the implications on dark matter in our Galaxy: both in the galactic core and in the halo. It includes the topics of linear and non-linear structure formation, phenomenology on galaxy rotation curves, gravitational lensing, and stellar strems, as the topics of main interest.
Thanks to the CLASH and Frontier Fields (FF) programs of the Hubble Space Telescope, it has been possible to identify an unprecedented number of strongly lensed sources in the central regions of several galaxy clusters. Complementing these observations with MUSE spectroscopy, we obtain high fidelity mass models for MACSJ1206, MACSJ0416, and AS1063. The models are consistent with the presence...
The nature of dark matter is expected to be most strongly expressed in dark matter subhaloes with mass $<10^{9}\mathrm{M}_{\odot}$. These subhaloes are accessible to us in the vicinity of the Milky Way (MW), through the abundance and structure of both luminous MW satellites and dark subhaloes that never form stars. In this talk I will present work on the properties of these subhaloes in two...
Fuzzy Dark Matter (FDM), consisting of ultralight bosons ($m_{\rm b} \sim 10^{-22} \rm eV$), is an intriguing alternative to Cold Dark Matter. Numerical simulations that solve the Schrodinger-Poisson (SP) equation show that FDM halos consist of a central solitonic core, which is the ground state of the SP equation, surrounded by an envelope of interfering excited states. These excited states...
We discuss the nature of phase transitions in the self-gravitating Fermi gas in Newtonian gravity and general relativity. When the particle number is above the Oppenheimer-Volkoff limit, we evidence the existence of a new turning point of mass-energy in the caloric curve leading to the collapse of the system towards a black hole. We mention possible applications of these results to the case of...
Large-scale N-body simulations have successfully reconstructed cosmic structure formation with increasing resolution and complexity, as observations corroborate. Complementary efforts have arrived at a hydrodynamical theory that explains cosmic structure evolution up to the non-linear regime. While the statistical properties of mass density perturbations for the observable universe as a whole...
The Galactic halo is criss-crossed by long stellar streams that are probably the remnants of defunct globular clusters and dwarf galaxies. I will present the recent discoveries of these structures from Gaia mission data. While streams clearly inform us in a direct way about past accretions onto our Galaxy, their most promising property is that they allow us to measure the Galactic acceleration...
Most astrophysical constraints on the warm dark matter particle mass have been limited to observations covering the last 12 billion years of the Universe. However, over the past few years, data from the Hubble Space Telescope and the EDGES (21cm) collaboration have allowed such constraints to be extended well into the first billion years, a crucial epoch inaccessible by any other means. In...
The imaging formation process for some DM profiles is carried out.
We use the analytic information given for the surface mass density in each case (some classic profiles, and some recently proposed), to obtain the geometrical and physical characterization that could provide information to identify new types of DM. The goal of this work is to understand if there are trails of the physical...
The Universe is homogeneous and isotropic on large scales, so on those scales it is usually modelled as a Friedmann-Lemaître-Robertson-Walker (FLRW) space-time. The non-linearity of the Einstein field equations raises concern over averaging over small-scale deviations form homogeneity and isotropy, with possible implications on the applicability of the FLRW metric to the Universe, even on...
The scalar field dark matter also called ultralight bosonic dark matter, has received considerable attention due to the number of problems it might help to solve. Among these are the cusp-core problem and the abundance of small structures of the standard cold dark matter model. In this talk, we show that multi-state solutions of the Gross-Pitaevskii-Poisson equations, interpreted as galactic...
The idea that dark matter could be made of stable relics of microscopic black holes is not new. In this article, we revisit this hypothesis, focusing on the creation of black holes by the scattering of trans-Planckian particles in the early Universe. The only new physics required in this approach is an unusually high-energy scale for inflation. We show that dark matter emerges naturally and we...
