Probing geometric proca in metric-palatini gravity with black hole shadow and photon motion

Ghorani, Elham and Puliçe, Beyhan and Atamurotov, Farruh and Rayimbaev, Javlon and Abdujabbarov, Ahmadjon and Demir, Durmuş Ali (2023) Probing geometric proca in metric-palatini gravity with black hole shadow and photon motion. European Physical Journal C, 83 (4). ISSN 1434-6044 (Print) 1434-6052 (Online)

Full text not available from this repository. (Request a copy)


Extended metric-Palatini gravity, quadratic in the antisymmetric part of the affine curvature, is known to lead to the general relativity plus a geometric Proca field. The geometric Proca, equivalent of the non-metricity vector in the torsion-free affine connection, qualifies to be a distinctive signature of the affine curvature. In the present work, we explore how shadow and photon motion near black holes can be used to probe the geometric Proca field. To this end, we derive static spherically symmetric field equations of this Einstein-geometric Proca theory, and show that it admits black hole solutions in asymptotically AdS background. We perform a detailed study of the optical properties and shadow of this black hole and contrast them with the observational data by considering black hole environments with and without plasma. As a useful astrophysical application, we discuss constraints on the Proca field parameters using the observed angular size of the shadow of supermassive black holes M87∗ and Sgr A∗ in both vacuum and plasma cases. Overall, we find that the geometric Proca can be probed via the black hole observations.
Item Type: Article
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Durmuş Ali Demir
Date Deposited: 05 Aug 2023 17:03
Last Modified: 05 Aug 2023 17:03

Actions (login required)

View Item
View Item