Conveners
DM IX
- Joshua Berger (Colorado State University)
In the age of gravitational wave astronomy, the possibility that some of the black holes in the universe have a primordial, rather than stellar, origin, and that they might be a non-negligible fraction of the cosmological dark matter, is quite intriguing. I will review the status of the field, and comment on search strategies and future prospects for detection across many decades in black hole...
Dark photon as an ultralight dark matter candidate can interact with the Standard Model particles via kinetic mixing. We propose to search for the ultralight dark photon dark matter using radio telescopes with solar observations. The dark photon dark matter can efficiently convert into photons in the outermost region of the solar atmosphere, the solar corona, where the plasma mass of photons...
In this talk I discuss how dark photons can produce bright observable flashes during binary neutron star mergers (BNS). Dark photons are a new massive vector field that kinetically mixes with the photon, and through this mixing interacts with charged standard model matter. It provides one of the three renormalizable portals between the Standard Model (SM) and dark sectors, which are by...
There has been much interest in novel models of dark matter that exhibit interesting behavior on galactic scales. A primary motivation is the observed Baryonic Tully-Fisher Relation in which the mass of galaxies increases as the quartic power of rotation speed. This scaling is not obviously accounted for by standard cold dark matter. This has prompted the development of dark matter models that...
I will present the anatomy of production mechanisms for sterile neutrino dark matter in the presence of new interactions among either active or sterile neutrinos. These new interactions can be mediated by a scalar or a vector, and allow sterile neutrinos to make up all the dark matter while safely evading all current experimental bounds. We identify three regimes of the mediator’s mass and...
A keV sterile neutrino ($\nu_s$) that mixes with active neutrinos ($\nu_a$) is a well-motivated warm dark matter candidate with rich cosmological and astrophysical implications. The production of such a particle in the early Universe typically relies on the existence of a large lepton asymmetry in the primordial plasma, which can however spoil the successful predictions of Big Bang...
I present a detailed study of the confinement phase transition in a dark sector with a SU(N) gauge group and a single generation of dark heavy quark. I focus on heavy enough quarks such that their abundance freezes out before the phase transition and the phase transition is of first-order. I show that during this phase transition the quarks are trapped inside contracting pockets of the...
The glueballs in the SU(N) Yang-Mills theory are theoretically the most natural among composite dark matter scenarios. In this work, we evaluate the interglueball potential in SU(N) lattice gauge theories using the HALQCD method and derive the glueball dark matter scattering cross section, and then constrain the scale parameter of the gauge theory from the observational data.
We search specifically for the heavy resonant scalars (H/A) decaying via $H\to hh$, $H\to t\bar{t}$ and $(b\bar{b})H\to \tau\tau$ final states, at the HL-LHC. After performing multivariate analysis using the BDT algorithm in various final states, we set upper limits on the production cross-section of a heavy scalar times its branching ratio into final state products for different heavy scalar...
