Dark Matters 2022

Session

Cosmo

2 Dec 2022, 10:00

Salle Solvay (NO Buidling, 5th floor) (ULB, Campus de la Plaine)

28. Gravitational Dark Matter portal in extra dimensions

Nuria Rius (Valencia University)

02/12/2022, 10:00

I will discuss recent work about the possibility of Dark Matter interacting only gravitationally in extra dimensional scenarios.

34. Dark matter freeze-in from semi-production

Maxim Laletin

02/12/2022, 10:40

We study a novel dark matter (DM) production mechanism based on the freeze-in through the inverse of semi-annihilation process. A peculiar feature of this scenario is that the production rate is suppressed by a small initial abundance of DM and consequently creating the observed abundance requires much larger coupling values than for the usual freeze-in. We provide a concrete example model...

27. Axion Star Explosions in the Early Universe

Prof. Malcolm Fairbairn (Physics, King's College London)

02/12/2022, 11:25

We consider axion stars which may explode at early times, changing the ionisation history of the Universe. We will explain the concept, the calculation and the constraints on parameter space.

29. Gravitational-wave event rates as a new probe for dark matter microphysics

Alexander C Jenkins (University College London)

02/12/2022, 12:05

Next-generation gravitational-wave (GW) observatories will provide exquisite measurements of the merger rate of high-redshift binary black holes (BBHs), detecting many thousands of these systems every year. The abundance of these binaries is a direct tracer of the early stages of star formation, and therefore of cosmic structure formation. This opens the possibility of using GW observations to...

30. New constraints on the dark matter-neutrino/photon scatterings

Gonzalo Herrera

02/12/2022, 12:20

In this talk, I will discuss the attenuation of high energy neutrinos and photons produced in a blazar when they propagate through the dark matter spike around the central black hole and the halo of the host galaxy. In particular, I will discuss new constraints on the dark matter-neutrino and dark matter-photon scattering cross sections obtained from the observation by IceCube of a few...

26. Cosmological tensions and DM models

Julien Lesgourgues (TTK, RWTH Aachen University)