Tidal effect in charged black hole enclosed by thin accretion disc in Rastall gravity

Abstract

We analyze the tidal effects in a charged black hole enclosed by a thin accretion disc in Rastall gravity (RG). We study the radial geodesic motion in charged black hole under the influence of perfect fluid matter. The radial geodesic motion sharply depends upon the perfect fluid matter. The components of tidal force are obtained by Riemann tensor on tetrad basis and geodesic deviation equation. We solve the geodesic deviation equations analytically for the radially free-falling geodesic around a charged black hole enclosed by a thin accretion disc in RG. The behavior of the geodesic deviation vector for such a geodesic under the influence of the tidal forces is probed. The radial and angular tidal forces disappear at a certain point. The angular tidal forces increases with the increase of Rastall parameter and radius horizon of black hole.