Raychaudhuri equations and gravitational collapse in Einstein-Cartan theory

@article{57481,
   author = {Hensh, Sudipta and Liberati, Stefano},
   article_location = {College Park (USA)},
   article_number = {8},
   doi = {http://dx.doi.org/10.1103/PhysRevD.104.084073},
   keywords = {TORSION;SPIN;SINGULARITIES},
   language = {eng},
   issn = {2470-0010},
   journal = {Physical Review D},
   title = {Raychaudhuri equations and gravitational collapse in Einstein-Cartan theory},
   url = {https://journals.aps.org/prd/abstract/10.1103/PhysRevD.104.084073},
   volume = {104},
   year = {2021}
}

TY  - JOUR
ID  - 57481
AU  - Hensh, Sudipta - Liberati, Stefano
PY  - 2021
TI  - Raychaudhuri equations and gravitational collapse in Einstein-Cartan theory
JF  - Physical Review D
VL  - 104
IS  - 8
SP  - "084073-1"-"084073-14"
EP  - "084073-1"-"084073-14"
PB  - American Physical Society
SN  - 24700010
KW  - TORSION;SPIN;SINGULARITIES
UR  - https://journals.aps.org/prd/abstract/10.1103/PhysRevD.104.084073
N2  - 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.
ER  - 

HENSH, Sudipta a Stefano LIBERATI. Raychaudhuri equations and gravitational collapse in Einstein-Cartan theory. \textit{Physical Review D}. College Park (USA): American Physical Society, 2021, roč.~104, č.~8, s.~''084073-1''-''084073-14'', 14 s. ISSN~2470-0010. Dostupné z: https://dx.doi.org/10.1103/PhysRevD.104.084073.