HENSH, Sudipta and Stefano LIBERATI. Raychaudhuri equations and gravitational collapse in Einstein-Cartan theory. Physical Review D. College Park (USA): American Physical Society, 2021, vol. 104, No 8, p. "084073-1"-"084073-14", 14 pp. ISSN 2470-0010. Available from: https://dx.doi.org/10.1103/PhysRevD.104.084073.
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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
Original 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
WWW 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, FÚ, RIV22, SGS-12-2019
Tags International impact, Reviewed
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 7/2/2022 11:13.
Abstract
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.
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