Black holes immersed in polytropic scalar field gas

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F25%3A50022547" target="_blank" >RIV/62690094:18470/25:50022547 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S2214404825000709?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2214404825000709?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jheap.2025.100389" target="_blank" >10.1016/j.jheap.2025.100389</a>

Result language

angličtina

Original language name

Black holes immersed in polytropic scalar field gas

Original language description

By implementing the concept of polytropic structures as a scalar field gas with a dark energy-like behavior, we obtain a static spherically symmetric black hole solution in the framework of general relativity. In this paper, we study the quasinormal modes, the greybody bound process, the shadow behaviors, and the sparsity of black holes with a surrounding polytropic scalar field gas. Using the Wentzel-Kramers-Brillouin (WKB) approach, we evaluate the impact of a particular set of polytropic parameters (xi, A) with a fixed setting of the polytropic index n on the oscillation frequency and damping rate of gravitational waves. The results show that the effect of the parameter xi is much less significant than that of the parameter A on the gravitational waves oscillation frequency and damping rate. Furthermore, the analysis of the greybody factor bounds reveals special insight into the effect of certain parameters where the multipole moments l and the polytropic index n have similar effects, in contrast to the pair of polytropic parameters (xi, A). In light of such a comparative study, we investigate, on the other hand, the third-order Pade WKB method, which results in a more accurate process for quasinormal mode frequencies compared to the third-order standard WKB method. In this way, exploring the sparsity of Hawking radiation is another task that provides a better understanding of the behavior of the black hole solution. In this respect, the results show that the black hole behaves like blackbody radiation for a sufficiently large entropy. And for xi = A = 0, the relevant sparsity acts exactly like the Schwarzschild sparsity. These results provide an insight into the dynamics of black holes with a surrounding polytropic scalar field gas from the analysis of their quasinormal modes, greybody factors, shadow behaviors, energy emission rate and sparsity process. Constraints on the associated BH parameters, derived from the Event Horizon Telescope observations of M87&quot; and Sgr A&quot;, indicate that this black hole model stands as a compelling candidate for representing astrophysical black holes.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

JOURNAL OF HIGH ENERGY ASTROPHYSICS

ISSN

2214-4048

e-ISSN

2214-4056

Volume of the periodical

47

Issue of the periodical within the volume

July

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

21

Pages from-to

"Article Number: 100389"

UT code for WoS article

001480493100001

EID of the result in the Scopus database

2-s2.0-105003091212