UCLA Dark Matter 2025

Session

SESSION 6: Astrophysics and Cosmology-2 (CHAIR:Andrew Benson -CIS)

25 Mar 2025, 10:15

UCLA Physics and Astronomy Building 1-425

116. Status of cosmic antinuclei searches

Philip Von Doetinchem (University of Hawaii at Manoa)

25/03/2025, 10:15

Talk

The precise measurement of cosmic antinuclei is an important means for identifying the nature of dark matter and other beyond-standard-model physics. Recent years have shown that identifying the nature of dark matter with cosmic positrons and antiprotons is challenging and has led to an increased interest in cosmic antideuteron and antihelium searches. Antideuterons and antihelium nuclei may...

105. A Tale of Two Black Hole Populations

Simeon Bird

25/03/2025, 10:30

Talk

I will discuss our recent analysis of the LIGO GW catalogue that suggests two separate, unmixed, BH populations, potentially with different spatial distributions or origins. I will also discuss suggestive results from a recent analysis of microlensing towards the galactic bulge.

125. Long-Range Dark Matter Self-Interactions in FIRE Simulations

Isabel Sands (Caltech)

25/03/2025, 10:45

Talk

In this talk, I present the first results from a new suite of Feedback in Realistic Environments (FIRE) simulations in which the dark matter is subject to a long-range self-interaction. This self-interaction takes the form of an attractive Yukawa potential parametrized by the strength of the force and its screening length, which we simulate on kiloparsec to megaparsec scales. We simulate...

191. Probing DM Substructure with Dynamical Heating in Ultra-Faint Dwarfs

Peter Graham (Stanford)

25/03/2025, 11:00

Talk

NA

86. Mapping out Dark Matter in the Milky Way

Lina Necib (MIT)

25/03/2025, 11:15

Talk

In this talk, I will explore the interfacing of simulations, observations, and machine learning techniques to construct a detailed map of Dark Matter in the Milky Way, focusing on the Galactic Center/Halo and dwarf galaxies. For the Galactic Halo, I will present a recent work that reveals a decline in the stellar circular velocity, inducing tensions with established estimates of the Milky...

82. Primordial Black Holes as Dark Matter Candidates: O(α) Corrections to Hawking Radiation

Makana Silva (Los Alamos National Laboratory)

25/03/2025, 11:30

Talk

Primordial black holes (PBHs) in the mass range $10^{17} - 10^{22} \, \text{g}$ are a promising candidate for the dark matter. At the lower end of this range, PBHs emit Hawking radiation with temperatures $T_H \gtrsim 100 \, \text{keV}$, allowing for electron-positron pair production and making their radiation detectable in high-energy surveys. To interpret these signals, it is crucial to...

14. Limits on primordial black holes as dark matter from two decades of the OGLE survey

Przemek Mróz

25/03/2025, 11:45

Talk

The idea that dark matter may be composed of dark compact objects, such as primordial black holes, was revived following the discoveries of gravitational waves from mergers of massive black holes by the LIGO and Virgo detectors.

If such black holes existed in large numbers in the Milky Way dark matter halo, they would cause long-timescale gravitational microlensing events lasting years....