Geodesics and scalar perturbations of Schwarzschild black holes embedded in a Dehnen-type dark matter halo with quintessence

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F25%3A50022986" target="_blank" >RIV/62690094:18470/25:50022986 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1402-4896/ae0ed7" target="_blank" >http://dx.doi.org/10.1088/1402-4896/ae0ed7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1402-4896/ae0ed7" target="_blank" >10.1088/1402-4896/ae0ed7</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Geodesics and scalar perturbations of Schwarzschild black holes embedded in a Dehnen-type dark matter halo with quintessence

Popis výsledku v původním jazyce

We present a comprehensive analysis of a Schwarzschild black hole embedded in a Dehnen-type dark-matter halo and surrounded by a quintessence field. We construct the composite spacetime metric and analyze its geometric properties, including horizon structure and curvature invariants. We find that increasing both the dark-matter core density rho s and the quintessence normalization parameter c enlarges the event horizon while reducing the cosmological horizon. We analyze timelike and null geodesics to determine the innermost stable circular orbits, photon-sphere radii, and shadow properties. Using the Gauss-Bonnet theorem, we compute weak-deflection angles and demonstrate that gravitational lensing intensifies as rho s and rs increase. Scalar perturbations are examined using the sixth-order WKB method and Pad &amp; eacute; approximants, supported by time-domain checks. We observe that the quasinormal modes are suppressed as the dark-matter density increases. Greybody factors and the sparsity of Hawking radiation are also computed, revealing that increased halo density enhances transmission and modifies their deviation from blackbody emission. Our results highlight the observable signatures of dark matter and quintessence in black-hole phenomenology, with testable implications for Event Horizon Telescope imaging and gravitational-wave spectroscopy.

Název v anglickém jazyce

Geodesics and scalar perturbations of Schwarzschild black holes embedded in a Dehnen-type dark matter halo with quintessence

Popis výsledku anglicky

We present a comprehensive analysis of a Schwarzschild black hole embedded in a Dehnen-type dark-matter halo and surrounded by a quintessence field. We construct the composite spacetime metric and analyze its geometric properties, including horizon structure and curvature invariants. We find that increasing both the dark-matter core density rho s and the quintessence normalization parameter c enlarges the event horizon while reducing the cosmological horizon. We analyze timelike and null geodesics to determine the innermost stable circular orbits, photon-sphere radii, and shadow properties. Using the Gauss-Bonnet theorem, we compute weak-deflection angles and demonstrate that gravitational lensing intensifies as rho s and rs increase. Scalar perturbations are examined using the sixth-order WKB method and Pad &amp; eacute; approximants, supported by time-domain checks. We observe that the quasinormal modes are suppressed as the dark-matter density increases. Greybody factors and the sparsity of Hawking radiation are also computed, revealing that increased halo density enhances transmission and modifies their deviation from blackbody emission. Our results highlight the observable signatures of dark matter and quintessence in black-hole phenomenology, with testable implications for Event Horizon Telescope imaging and gravitational-wave spectroscopy.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Physica scripta

ISSN

0031-8949

e-ISSN

1402-4896

Svazek periodika

100

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

22

Strana od-do

"Article number: 105008"

Kód UT WoS článku

001592108600001

EID výsledku v databázi Scopus

2-s2.0-105018858312