Conveners
Parallel: Dark Matter 4
- Christopher Cappiello (Queen's University)
Ultra light boson is an attractive dark matter candidate whose classical wave nature implies various interesting phenomena. Considering its coupling to neutrinos in this talk, we discuss how the required dark matter population can be generated and/or its impact on the neutrino oscillations.
The elastic scattering between dark matter (DM) and radiation can potentially explain small-scale observations that the cold dark matter faces as a challenge, as damping density fluctuations via dark acoustic oscillations in the early universe erases small-scale structure. We study a semi-analytical subhalo model for interacting dark matter with radiation, based on the extended Press-Schechter...
In this talk, I will discuss the attenuation of high-energy particles in Active Galactic Nuclei (AGN), when they propagate through the dark matter spike around the central black hole and the halo of the host galaxy. First, based on 2209.06339, I will discuss new constraints on the dark matter-neutrino and dark matter-photon scattering cross sections obtained from the observation by IceCube of...
We study the impact of the interaction between DM and the cosmic neutrino background on the evolution of galactic dark matter halos. The energy transfer from the neutrinos to the dark matter can heat the center of the galaxy and make it cored. This effect is efficient for the small galaxies such as the satellite galaxies of the Milky Way and we can put conservative constraint on the...
We propose a Dirac neutrino portal dark matter scenario by minimally extending the particle content of the Standard Model (SM) with three right-handed neutrinos, a Dirac fermion dark matter candidate, and a complex scalar, all of which are singlets under the SM gauge group. symmetry $Z_4$ has been introduced for the stability of dark matter candidates and also to ensure the Dirac nature of...
We propose a new production mechanism for keV sterile neutrino dark matter which does not rely on the oscillations between sterile and active neutrinos nor on the decay of additional heavier particles, and works without employing any new interactions for the sterile neutrinos beyond the standard Yukawa couplings. The dark matter neutrinos are instead produced out of thermal freeze-out, much...
