Dark Matter 2021: From the Smallest to the Largest Scales

Session

DM and Cosmology

Sep 16, 2021, 4:00 PM

Virtual

Conveners

DM and Cosmology

• Sven Heinemeyer

DM and Cosmology

• Sven Heinemeyer

102. Overview: Cosmological probes of DM

Katelin Schutz (McGill University)

9/16/21, 4:00 PM

I will review some recent developments in cosmological probes of dark matter properties, including constraints on the dark matter thermal history, mass, and interaction with baryons. The cosmological probes covered in this talk will include Big Bang nucleosynthesis, the cosmic microwave background, 21 cm cosmology, the Lyman-alpha forest, and lensing as well as “near-field” probes like the...

17. How warm are non-thermal relics? Out-of-equilibrium dark matter production

Mathias Pierre (IFT-UAM Madrid)

9/16/21, 4:50 PM

By facing strong experimental constraints notably from direct detection, many dark matter scenarios based on the Weakly Interacting Massive Particles (WIMPs) paradigm are pushed towards corners of viable parameter space. Several alternative production mechanisms have received a lot of attention over the past few years. In this talk, I will present various possibilities of producing dark matter...

24. Can we constrain dark matter at the limits of galaxy formation?

Prof. Ferah Munshi (University of Oklahoma)

9/16/21, 5:10 PM

Current work to directly detect dark matter (DM) via experiment has so far yielded only upper limits to the interaction between DM and normal matter, leaving astrophysical tests as an intriguing test ground. I will present results from a flagship suite of cosmological hydrodynamic simulations of dwarf galaxies (including at the lowest masses, ultra-faint dwarfs) with results that concentrate...

44. Dark-matter-deficient galaxies in the hydrodynamical simulation IllustrisTNG

Elisa Tau (Universidad de La Serena)

9/16/21, 5:50 PM

Dark matter deficient galaxies (DMDGs) could have lost their dark matter halos due to interactions during their evolution; in particular, during their fusion history. The existence of these galaxies is a debated subject, both from the observational and theoretical points of view. In this work, we study the population of dark matter deficient galaxies at different redshifts using the...

45. The Interplay Between Primordial Black Hole Evaporation and Dark Matter Production

Andrew Cheek (CP3, UCL)

9/16/21, 6:10 PM

Hawking evaporation of black holes is expected to copiously produce all kinds of particles, regardless of their charges. For primordial black holes of a certain mass, this effect has huge implications on dark matter phenomenology. I will discuss such implications in the context of models that contain one or more dark sector particles, as well as models which couple to the Standard Model....

55. Simulations of Axion Minihalos

Huangyu Xiao (University of Washington)

9/16/21, 6:30 PM

Our work estimates the present-day abundance of axion substructures, as is necessary for predicting their effect on cosmological microlensing caustics and pulsar timing. Our calculations suggest that if pulsar timing and microlensing probes can reach recent sensitivity forecasts, they may be sensitive to the post-inflation axion dark matter scenario, even when accounting for uncertainties...

104. Probing Baryonic Dark Matter Models with Gravitational Waves

Bartosz​ Fornal

9/16/21, 6:50 PM

Gravitational waves provide a unique method of testing theories with extended gauge symmetries. In particular, spontaneous symmetry breaking can lead to a detectable stochastic gravitational wave background generated by cosmic strings and first order phase transitions in the early universe. I will discuss the unique gravitational wave signature of a dark matter model with gauged baryon and...