PIKIMO Fall 2023

Session

Noon session

11 Nov 2023, 11:10

IU Swain Hall West

17. Dark Matter Search on Chips

Christina Gao

11/11/2023, 11:10

Axions and axion-like particles are well motivated candidates for dark matter (DM) and have a signature two photon vertex. The most sensitive axion DM search is at the gigahertz (GHz) regime. It relies on microwave cavities with high quality factors resonantly converting axion DM to cavity photons in the background of a static magnetic field. However, axion DM mass could span a vast range...

9. Improved Constraints on Dark Matter Annihilations Around Primordial Black Holes

Prolay Chanda

11/11/2023, 11:25

Cosmology may give rise to appreciable populations of both particle dark matter and primordial black holes (PBH) with the combined mass density providing the observationally inferred value $\Omega_{\rm DM}\approx0.26$. Early studies highlighted that scenarios with both particle dark matter and PBH are strongly excluded by $\gamma$-ray limits for particle dark matter with a velocity...

14. Optimal anti-ferromagnets for light dark matter detection

Dr Shashin Pavaskar

11/11/2023, 11:40

We propose anti-ferromagnets as optimal targets to hunt for sub-MeV dark matter with spin-dependent interactions. These materials allow for multi-magnon emission even for very small momentum transfers, and are therefore sensitive to dark matter particles as light as the keV. We use an effective theory to compute the event rates in a simple way. Among the materials studied here, we identify...

8. QCD-Collapsed Domain Walls

MRUNAL PRASHANT KORWAR

11/11/2023, 11:55

For a discrete symmetry that is anomalous under QCD, the domain walls produced
in the early universe from its spontaneous breaking can naturally annihilate due to QCD
instanton effects. The gravitational waves generated from wall annihilation have their
amplitude and frequency determined by both the discrete symmetry breaking scale and
the QCD scale. The evidence of stochastic...