Influence of quantum correction on the Schwarzschild black hole polarized image

TL;DR

This paper investigates how quantum corrections to Schwarzschild black holes influence polarization images, revealing that increased quantum deformation expands polarization regions and decreases intensity, potentially offering observational evidence of quantum gravity effects.

Contribution

It introduces a model for polarization imaging of quantum-corrected Schwarzschild black holes, analyzing the impact of quantum deformation on polarization features under various conditions.

Findings

Larger quantum deformation expands polarization regions.

Polarization intensity decreases with increased quantum deformation.

Polarization behavior varies with observation angles and magnetic fields.

Abstract

Using a model of an accretion disk around a Schwarzschild black hole, the analytic estimates for image polarization were derived by Narayan $et~al.$. [Astrophys. J, 102, 912 (2021)]. Recently, the EHT team also obtained polarization images of the Sgr A$^{*}$ and measured both linear and circular polarization [Astrophys. J. Lett, 964, L25 (2024)]. We find that quantum correction effects can also influence polarization information. Considering the quantum corrected Schwarzschild black hole (Kazakov-Solodukhin black hole), we derive the polarization intensity of the target black hole and investigate polarization images under different parameters. It is found that a larger quantum deformation leads to an expansion of the polarization region, while the polarization intensity value decrease. Under different observation angles, magnetic fields, fluid direction angles, and fluid velocity conditions, we also derive polarization images of corrected black holes. These key indicators not only affect the intensity of polarization but also the direction of polarization. We establish the relationship between polarization intensity and quantum correction deformation parameters, revealing a gradual decline in polarization intensity with reduced radius and an anti-polarization behavior induced by the progressive increase in deformation parameters at a constant radius. Our analysis may provide observational evidence for quantum effect of general relativity.