Black Holes in Proca-Gauss-Bonnet Gravity with Primary Hair: Particle Motion, Shadows, and Grey-Body Factors

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F25%3A50022594" target="_blank" >RIV/62690094:18470/25:50022594 - isvavai.cz</a>
Result on the web
<a href="https://www.sciltp.com/journals/ijgtp/articles/2507000929" target="_blank" >https://www.sciltp.com/journals/ijgtp/articles/2507000929</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.53941/ijgtp.2025.100004" target="_blank" >10.53941/ijgtp.2025.100004</a>

Result language
angličtina
Original language name
Black Holes in Proca-Gauss-Bonnet Gravity with Primary Hair: Particle Motion, Shadows, and Grey-Body Factors
Original language description
We investigate classical and semiclassical signatures of black holes in a recently proposed Proca-Gauss-Bonnet gravity model that admits asymptotically flat solutions with primary hair. Two distinct classes of spherically symmetric metrics arise from different relations between the coupling constants of scalar-tensor and vector-tensor Gauss-Bonnet interactions. For each geometry, we examine the range of parameters permitting horizon formation and analyze the motion of test particles and light rays. We compute characteristic observables including the shadow radius, Lyapunov exponent, innermost stable circular orbit (ISCO) frequency, and binding energy. Additionally, we study scalar and Dirac field perturbations, derive the corresponding effective potentials, and calculate the grey-body factors (GBFs) using both the sixth-order Wentzel-Kramers-Brillouin (WKB) method and their correspondence with quasinormal modes (QNMs). Our results show that the QNM-based approximation of GBFs is accurate for sufficiently large multipole numbers and that deviations from Schwarzschild geometry become pronounced for large values of the Proca hair and Gauss-Bonnet couplings.
Czech name
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Czech description
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Project
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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
International Journal of Gravitation and Theoretical Physics
ISSN
3083-5313
e-ISSN
3083-5313
Volume of the periodical
1
Issue of the periodical within the volume
1
Country of publishing house
AU - AUSTRALIA
Number of pages
13
Pages from-to
"Article number: 4"
UT code for WoS article
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EID of the result in the Scopus database
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