Study of relativistic hot accretion flow around Kerr-like Wormhole

TL;DR

This paper explores the structure and solutions of relativistic accretion flows around Kerr-like wormholes, analyzing how various parameters influence flow properties and potential astrophysical observables.

Contribution

It provides the first comprehensive classification of all global accretion solutions around Kerr-like wormholes, including transonic and subsonic flows, with detailed parameter space analysis.

Findings

Identified all classes of accretion solutions for Kerr-like wormholes.

Mapped the parameter space for multiple critical point solutions.

Calculated disc luminosity for transonic flows considering free-free emissions.

Abstract

We investigate the structure of relativistic, low-angular momentum, inviscid advective accretion flow in a stationary axisymmetric Kerr-like wormhole (WH) spacetime, characterized by the spin parameter ($a_{\rm k}$), the dimensionless parameter ($\beta$), and the source mass ($M_{\rm WH}$). In doing so, we self-consistently solve the set of governing equations describing the relativistic accretion flow around a Kerr-like WH in the steady state, and for the first time, we obtain all possible classes of global accretion solutions for transonic as well as subsonic flows. We study the properties of dynamical and thermodynamical flow variables and examine how the nature of the accretion solutions alters due to the change of the model parameters, namely energy ($\mathcal{E}$), angular momentum ($\lambda$), $a_{\rm k}$, and $\beta$. Further, we separate the parameter space in $\lambda-\mathcal{E}$ plane according to the nature of the flow solutions, and study the modification of the parameter space by varying $a_{\rm k}$ and $\beta$. Moreover, we retrace the parameter space in $a_{\rm k}-\beta$ plane that allows accretion solutions containing multiple critical points. Finally, we calculate the disc luminosity ($L$) considering free-free emissions for transonic solutions as these solutions are astrophysically relevant and discuss the implication of this model formalism in the context of astrophysical applications.