June 6, 2023

Alireza Khesali

Degree: Professor
Address: Department of Physics, Faculty of Basic Sciences,University of Mazandaran
Education: Ph.D in َAstrophysics
Phone: 35343085
Faculty: Faculty of Science


Title Dynamics of accretion disks in a constant curvature f(R)f(R) -gravity
Type Article
Black Holes Accretion Disks, Modified Gravity
Researchers Najmeh Alipour Kafshgar (First researcher) , Alireza Khesali (Second researcher) , Kourosh Nozari (Third researcher)


So far the basic physical properties of matter forming a thin accretion disc in the static and spherically symmetric space–time metric of the vacuum f(R) modified gravity models (Pun et al. in Phys. Rev. D 78:024043, 2008) and building radiative models of thin accretion disks for both Schwarzschild and Kerr black holes in f(R) gravity (Perez et al. in Astron. Astrophys. 551:4, 2013) were addressed properly. Also von Zeipel surfaces and convective instabilities in f(R) -Schwarzschild(Kerr) background have been investigated recently (Alipour et al. in Mon. Not. R. Astron. Soc. 454:1992, 2015). In this streamline, here we study the effects of radial and angular pressure gradients on thick accretion disks in Schwarzschild geometries in a constant curvature f(R) modified gravity. Since thick accretion disks have high accretion rate, we study configuration and structure of thick disks by focusing on the effect of pressure gradient on formation of the disks. We clarify our study by assuming two types of equation of state: polytropic and Clapeyron equation of states.