Dark Interactions: new perspectives for theory and experiment

Session

Session III

15 Nov 2022, 16:35

Online

Conveners

Session III

• Mauro Valli (YITP, Stony Brook)

Session III

• Robert McGehee

13. Bounds on Long-lived Dark Matter Mediators from Neutron Stars

Thông Nguyễn Trần Quang

15/11/2022, 16:35

By measuring the flux of Dark Matter (DM) annihilations from a very long
distance, Indirect Detection (ID) can be used to investigate Dark Matter (DM) models with very weak couplings and long-lived mediators. And with a large population density and a strong gravitational bound, Neutron Stars (NS) are very effective to collect DM in Galactic Center (GC) to increase DM density, thus enhancing...

23. Thermal Misalignment of Ultralight dark matter

Mudit Rai

15/11/2022, 16:50

Abstract is attached as requested.

17. Bounds on ultralight bosons from the Event Horizon Telescope observation of Sgr A$^*$

Priyank Parashari (Indian Institute of Science)

15/11/2022, 17:05

Recently, the Event Horizon Telescope (EHT) has observed the first image of the supermassive black hole
(Sgr A$^*$) at the center of our own Milky Way galaxy. EHT observations also give some information
about the spin of Sgr A$^*$. They found that the dimensionless spin parameters (a$^*$) 0.5 and 0.94
have passed all their tests. These observations can be used to study the Ultra light...

14. Faint light of old neutron stars from dark matter capture and detectability at the James Webb Space Telescope

Shiuli Chatterjee

15/11/2022, 17:20

Neutron stars (NS) of age >109 yrs exhaust thermal and rotational energies and cool down to temperatures below O(100) K. Accretion of particle dark matter (DM) by such NS can heat them up through kinetic and annihilation processes. This increases the NS surface temperature to a maximum of ∼2550 K in the best case scenario. The maximum accretion rate depends on the DM ambient density and...

16. A search for dark matter using sub-PeV $\gamma$-rays observed by Tibet AS$_{\gamma}$

Akash Kumar Saha

15/11/2022, 17:35

Detection of high-energy diffuse gamma-rays is one of the most important aspects of modern astrophysics. Recently Tibet AS$_\gamma$ collaboration [1] has detected galactic sub-PeV diffuse gamma-rays, which also happens to be the highest energy diffuse gamma-rays detected to date. In this work [2], we show that these high-energy diffuse gamma rays can be an excellent probe for detecting...

38. Searching for New Physics with Neutrino Experiments

Asli Abdullahi

16/11/2022, 15:35

In this talk, we discuss the unique potential of neutrino experiments to probe a wide range of low-energy new physics models. We review some of the main ways dark sectors have already been studied at neutrino experiments and how we can further probe new physics with next-generation experiments. As a case study, we consider the example of HNLs endowed with hidden sector interactions and how...

20. Probing Neutrino Portal Dark Matter: From Colliders to Supernovae

Douglas Tuckler

16/11/2022, 16:05

New beyond-the-Standard Model mediators that couple predominantly to neutrinos are not yet probed by existing experimental searches. Such a neutrinophilic mediator is well motivated for addressing the origin of several neutrino-portal dark matter candidates, including thermal freeze-out and sterile-neutrino dark matter scenarios. In this talk, we explore the sensitivity to this scenario from...

30. Opportunities for Axion Searches at Beam Dumps and Stopped-Pion Facilities

Adrian Thompson

16/11/2022, 16:20

Pseudo-Nambu-Goldstone Bosons (pNGBs) are a byproduct of many theories that address long-standing puzzles of the Standard Model (SM). Axions and axion-like particles (ALPs) which have spawned from solutions to the strong-CP problem can also make good dark matter candidates and arise ubiquitously in string theory, and in other theories with spontaneously broken symmetries. ALPs in the MeV mass...