2021
Raychaudhuri equations and gravitational collapse in Einstein-Cartan theory
HENSH, Sudipta and Stefano LIBERATIBasic 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
Article in a journal
Field of Study
10308 Astronomy
Country of publisher
United States of America
Confidentiality degree
is not subject to a state or trade secret
References:
Impact factor
Impact factor: 5.407
RIV identification code
RIV/47813059:19630/21:A0000135
Organization unit
Institute of physics in Opava
UT WoS
000711351800011
EID Scopus
2-s2.0-85118569400
Keywords in English
TORSION;SPIN;SINGULARITIES
Tags
Tags
International impact, Reviewed
Changed: 7/2/2022 11:13, Mgr. Pavlína Jalůvková
Abstract
In the original language
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.