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Gravitational collapse in generalized K-essence emergent Vaidya spacetime via f(R,T) gravity

Physics

Gravitational collapse in generalized K-essence emergent Vaidya spacetime via f(R,T) gravity

A. Panda, G. Manna, et al.

This groundbreaking study explores gravitational collapse in generalized emergent Vaidya spacetime through the lens of f(R,T) gravity and K-essence theory. Authors Arijit Panda, Goutam Manna, Saibal Ray, Maxim Khlopov, and Md Rabiul Islam uncover remarkable findings including the potential for naked singularities and the intriguing concept of a gravitational dipole at play within our universe.

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~3 min • Beginner • English
Abstract
This study focuses on investigating the collapse possibilities of the generalized emergent Vaidya spacetime within the framework of f (R,T ) gravity, specifically in the setting of K-essence theory. The Dirac-Born-Infeld type non-standard Lagrangian is used in this work to determine the emergent metric Ḡµν, which is not conformally equal to the usual gravitational metric. Here, we employ the function f (R,T ) to represent the additive character of the emergent Ricci scalar (R) and trace of the emergent energy-momentum tensor (T). In our analysis, it can be shown that certain selections of f (R,T ) can lead to the presence of a naked singularity resulting from gravitational collapse. Additionally, alternative choices of f (R,T ) were found to yield an accelerating universe primarily governed by dark energy. In addition, the investigation revealed the existence of both positive and negative masses, which can be understood as a gravitational dipole. It is also found that the K-essence theory has the potential to serve as both a dark energy framework and a simple gravitational theory at the same time, allowing for the investigation of a wide range of cosmological phenomena.
Publisher
Not specified in provided text
Published On
Aug 25, 2023
Authors
Arijit Panda, Goutam Manna, Saibal Ray, Maxim Khlopov, Md Rabiul Islam
Tags
gravitational collapse
Vaidya spacetime
f(R,T) gravity
K-essence theory
dark energy
naked singularities
gravitational dipole
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