Hamiltonian Formulation of Relativistic Magnetohydrodynamic Accretion on a General Spherically Symmetric and Static Black Hole: Quantum effects on Shock States

TL;DR

This paper develops a Hamiltonian framework for relativistic magnetohydrodynamic accretion onto a black hole, analyzing shock states and quantum effects, and finds that quantum corrections tend to push shock locations outward.

Contribution

It introduces a Hamiltonian formulation for MHD accretion onto black holes and examines quantum effects on shock states, extending previous work to include quantum corrections.

Findings

Quantum effects do not favor shock states.

Quantum corrections push shock locations outward.

Altered positions of sonic points in quantum-corrected spacetime.

Abstract

In this paper, our aim is to extend our earlier work [A. K. Ahmed et al., Eur. Phys. J. C (2016) 76:280] thereby investigating an axisymmetric plasma flow with the angular momentum onto a spherical black hole. To accomplish that goal, we focus on the case that the ideal magnetohydrodynamic approximation is valid and utilizing certain conservation laws which arise from certain symmetries of the system. After formulating a Hamiltonian of the physical system, we solve the Hamilton equations and look for critical solutions of (both in and out) flows. Reflecting the difference from the Schwarzschild spacetime, the positions of sonic points (fast magnetosonic point, slow magnetosonic point, Alfv\'en point) are altered. We explore several kinds of flows including critical, non-critical, global, magnetically arrested and shock induced. Lastly we analyze the shock states near a specific quantum corrected Schwarzschild black hole and deduce that quantum effects do not favor shock states by pushing the shock location outward.