Aseem Paranjape

Inter-University Centre for Astronomy & Astrophysics (IUCAA)

 Pune, India

The radial acceleration relation in a LCDM universe

Abstract: I will discuss some recent analytical insights into the nature of the `radial acceleration relation’ (RAR) between total and baryonic centripetal acceleration profiles of central galaxies in the Lambda-cold dark matter (LCDM) framework. Specifically, there is an intimate connection between the RAR and the physics of quasi-adiabatic relaxation of dark matter in the presence of baryons in the galaxy’s parent halo. Using analytical approximations and a realistic LCDM mock galaxy catalog, we have explored the sensitivity of the RAR in different acceleration regimes to quasi-adiabatic relaxation physics, halo mass and concentration, and the abundance of diffuse gas in the halo outskirts. These results cleanly demonstrate how the mean RAR and its scatter emerge from the interplay of dark matter and baryons in the LCDM paradigm. Time permitting, I will also discuss some new results demonstrating that LCDM predicts a statistical `external field effect’ in which the shape of the RAR of any galaxy correlates with the gravitational acceleration due to mass external to the galaxy, without any violation of the strong equivalence principle.

یکشنبه 30 آبان 1400، ساعت 19:00

Sunday 21 November 2021 – 19:00 Tehran Time

اتاق سمینار مجازی –Virtual Seminar Room

https://vc.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest