Geodesics and scalar perturbations of Schwarzschild black holes embedded in a Dehnen-type dark matter halo with quintessence
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Geodesics and scalar perturbations of Schwarzschild black holes embedded in a Dehnen-type dark matter halo with quintessence
Original language description
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 & 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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physica scripta
ISSN
0031-8949
e-ISSN
1402-4896
Volume of the periodical
100
Issue of the periodical within the volume
10
Country of publishing house
GB - UNITED KINGDOM
Number of pages
22
Pages from-to
"Article number: 105008"
UT code for WoS article
001592108600001
EID of the result in the Scopus database
2-s2.0-105018858312