Tootfinder

Accretion Flares from Stellar Collisions in Galactic Nuclei
Betty X. Hu, Avi Loeb
https://arxiv.org/abs/2404.07255 https://arxiv.org/…

Accretion Flares from Stellar Collisions in Galactic Nuclei
The strong tidal force in a supermassive black hole's (SMBH) vicinity, coupled with a higher stellar density at the center of a galaxy, make it an ideal location to study the interaction between stars and black holes. Two stars moving near the SMBH could collide at a very high speed, which can result in a high energy flare. The resulting debris can then accrete onto the SMBH, which could be observed as a separate event. We simulate the light curves resulting from the fallback accretion in the a…

Hydrodynamical simulations of merging galaxy clusters: giant dark matter particle colliders, powered by gravity
Ellen L. Sirks, David Harvey, Richard Massey, Kyle A. Oman, Andrew Robertson, Carlos Frenk, Spencer Everett, Ajay S. Gill, David Lagattuta, Jacqueline McCleary
https://arxiv.org/abs/2405.00140

Hydrodynamical simulations of merging galaxy clusters: giant dark matter particle colliders, powered by gravity
Terrestrial particle accelerators collide charged particles, then watch the trajectory of outgoing debris - but they cannot manipulate dark matter. Fortunately, dark matter is the main component of galaxy clusters, which are continuously pulled together by gravity. We show that galaxy cluster mergers can be exploited as enormous, natural dark matter colliders. We analyse hydrodynamical simulations of a universe containing self-interacting dark matter (SIDM) in which all particles interact via g…