J 2021

Raychaudhuri equations and gravitational collapse in Einstein-Cartan theory

HENSH, Sudipta and Stefano LIBERATI

Basic information

Original name

Raychaudhuri equations and gravitational collapse in Einstein-Cartan theory

Authors

HENSH, Sudipta (356 India, belonging to the institution) and Stefano LIBERATI

Edition

Physical Review D, College Park (USA), American Physical Society, 2021, 2470-0010

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

RIV identification code

RIV/47813059:19630/21:A0000135

Organization unit

Institute of physics in Opava

DOI

http://dx.doi.org/10.1103/PhysRevD.104.084073

UT WoS

000711351800011

Keywords in English

TORSION;SPIN;SINGULARITIES

Tags

2022, , RIV22, SGS-12-2019

Tags

International impact, Reviewed
Změněno: 7/2/2022 11:13, Mgr. Pavlína Jalůvková

Abstract

V originále

The Raychaudhuri equations for the expansion, shear, and vorticity are generalized in a spacetime with torsion for timelike as well as null congruences. These equations are purely geometrical like the original Raychaudhuri equations and could be reduced to them when there is no torsion. Using the Einstein-CartanSciama-Kibble field equations, the effective stress-energy tensor is derived. We also consider an Oppenheimer-Snyder model for the gravitational collapse of dust. It is shown that the null energy condition is violated before the density of the collapsing dust reaches the Planck density, hinting that the spacetime singularity may be avoided if there is a nonzero torsion, i.e., if the collapsing dust particles possess intrinsic spin.
Displayed: 24/12/2024 03:28