190 citations · 1k across the 55 of their papers we have counts for
5 papers · 1 filter
Dynamical Friction and Tidal Interactions
Mahmood Roshan, Bahram Mashhoon
We discuss dynamical friction in an -body system in the presence of tidal interactions caused by a distant external source. Using the distant tide approximation, we develop a pe…
Dynamical Friction in Nonlocal Gravity
Mahmood Roshan, Bahram Mashhoon
We study dynamical friction in the Newtonian regime of nonlocal gravity (NLG), which is a classical nonlocal generalization of Einstein's theory of gravitation. The nonlocal aspect…
Fast galaxy bars continue to challenge standard cosmology
Mahmood Roshan, Neda Ghafourian, Tahere Kashfi +5
Many observed disc galaxies harbour a central bar. In the standard cosmological paradigm, galactic bars should be slowed down by dynamical friction from the dark matter halo. This…
Barred spiral galaxies in modified gravity theories
Mahmood Roshan, Indranil Banik, Neda Ghafourian +4
When bars form within galaxy formation simulations in the standard cosmological context, dynamical friction with dark matter (DM) causes them to rotate rather slowly. However, almo…
Relativistic Tidal Accelerations in the Exterior Schwarzschild Spacetime
Mahmood Roshan, Bahram Mashhoon
We study further a general relativistic mechanism for the acquisition of tidal energy by free test particles near a gravitationally collapsed configuration. Specifically, we invest…