Astrophysical signatures of black holes in generalized Proca theories

Md. Mostafizur Rahman, Anjan A. Sen

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Explaining the late-time acceleration is one of the most challenging tasks for theoretical physicists today. Infrared modification of Einstein's general theory of relativity (GR) is a possible route to model late-time acceleration. In this regard, vector-tensor theory, as a part of gravitational interactions on large cosmological scales, has been proposed recently. This involves generalization of a massive Proca Lagrangian in curved spacetime. Black hole solutions in such theories have also been constructed. In this paper, we study different astrophysical signatures of such black holes. We first study the strong lensing and time delay effect of such static spherically symmetric black hole solutions, in particular for the case of gravitational lensing of the star S2 by Sagittarius A∗ at the centre of Milky Way. We also construct the rotating black hole solution from this static spherically symmetric solution in Proca theories using the Newman-Janis algorithm and subsequently study lensing, time delay and black hole shadow effect in this rotating black hole spacetime. We discuss the possibility of detecting the Proca hair in future observations.

Original languageEnglish
Article number024052
JournalPhysical Review D
Volume99
Issue number2
DOIs
Publication statusPublished - 15 Jan 2019

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astrophysics
signatures
time lag
hair
relativity
routes
tensors
stars
interactions

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Astrophysical signatures of black holes in generalized Proca theories. / Rahman, Md. Mostafizur; Sen, Anjan A.

In: Physical Review D, Vol. 99, No. 2, 024052, 15.01.2019.

Research output: Contribution to journalArticle

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