Conveners
Dark Matter Searches with Liquid Xenon and Argon Detectors and Self Gravitating Systems and Dark Matter: Block 1
- Soroush Shakeri (IUT and ICRANet-Isfahan)
- She-Sheng Xue (ICRANet, Physics Department, Sapienza University of Rome)
Description
The evidence for the existence of dark matter (DM) which makes up 85% of the matter in the universe, is implied from various astrophysical and cosmological observations, but the fundamental nature of DM remains one of the foremost open questions in physics. Research into the direct detection of DM particles has revealed a vast numbers of theoretical and experimental efforts so far. Among different detection methods, DM searches based on nuclear and electronic recoil using Liquid Xenon (LXe) and Liquid Argon (LAr) have great discovery potential and continue to play a major role in the field.
In this session, we will discuss possible signatures of different sub-Gev dark matter candidates within current and future LXe/LAr detectors.We welcome presentations of recent results, ongoing efforts and theoretical attempts in the next generation of XENON detectors such as XENONnT, LZ, PandaX-II and Darwin, and also upcoming Argon detectors such as ArDM, DarkSide-50, DEAP-3600, and MiniCLEAN. We are open to accept talks about the XENON1T new observation on low-energy excess in electronic recoils and possible requirement for further confirmation with more precise future instruments. Both contributions on experimental and theoretical efforts are also welcome.
The dual phase Time Projection Chamber detectors exploiting Xenon element is the leading technology in the field of direct Dark Matter searches, as testified by the most stringent upper Limit on WIMP-nucleon cross section set by the XENON1T experiment. The XENONnT experiment, currently, under commissioning at the Gran Sasso underground laboratories, is ready to start its physics program. It...
In this talk I will present a class of direct detection signals; absorption of fermionic dark matter. I enumerate the operators through dimension six which lead to fermionic absorption, study their direct detection prospects, and summarize additional constraints on their suppression scale. Such dark matter is inherently unstable as there is no symmetry which prevents dark matter decays....
There is a robust signal for a 511 keV photon line from the galactic center which may originate from dark matter particles with masses of a few MeV. I will introduce a model in which dark matter first decays into a pair of intermediate pico-charged particles CC¯ with a lifetime much larger than the age of the universe. The galactic magnetic field accumulates the relativistic CC¯ that...
We perform accurate relativistic atomic many-body calculations of the effects of dark matter produced in underground laboratories. Our recent calculation of the ionization of atoms by absorption of scalar particles gives cross section, which is several orders of magnitude smaller than that calculated by other authors. The reason is that the traditional plain wave approximation for outgoing...
In this talk, we present an effective model for the sterile neutrino dark matter candidate. Due to new physics at the UV scale, three sterile neutrinos couple with SM fermions and gauge bosons via the SM gauge symmetric four-fermion interactions. Upon the spontaneous symmetry breaking, sterile neutrinos become massive and possess effective couplings to SM particles. We will show that the...
The evolution and equilibrium structure of dark matter halos has been well studied using N-body simulations. However, theoretical understanding, for example, based on statistical mechanics has been more challenging. A decade ago we showed that extremizing the number of microstates with a given energy per unit mass, under the constraints of conserved total energy and mass, leads to the maximum...
Preliminary results of the investigation of the properties of 13 clusters of galaxies from CfA2 redshift survey are discussed in the presented article. The distributions on absolute magnitude and luminosity represent two areas for clusters ##88, 1101, 1046, 142, 933, 1242, 1652, 107, 150, 316, 317, 961, 977. Redshifts of these clusters are in the region 0.002 – 0.022. The distributions on...
We consider the possibility that dark matter is made of self-gravitating Bose-Einstein condensates (BECs) described by the Schrodinger-Poisson or Gross-Pitaevskii-Poisson equations. We determine the mass-radius relation of self-gravitating BECs with repulsive or attractive self-interaction at zero temperature. When the self-interaction is attractive, we evidence the existence of a maximum mass...
