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SUMMARY:Torsion-Induced Four-Fermion Interactions in Gravitational Collaps
 e
DTSTART;VALUE=DATE-TIME:20261109T010000Z
DTEND;VALUE=DATE-TIME:20261109T013000Z
DTSTAMP;VALUE=DATE-TIME:20261023T133033Z
UID:indico-contribution-2964@indico.itp.ac.cn
DESCRIPTION:Speakers: Sagar Kumar Maity (S. N. Bose National Center for Ba
 sic Sciences)\nThe intrinsic spin of fermions generates torsion in spaceti
 me. This gives rise to a parity-violating\, nonuniversal four-fermion inte
 raction\, which is expected to become significant in dense matter\, such a
 s in early-universe cosmology or in neutron stars. We calculate the effect
  of the interaction term in a gravitationally collapsing gas of fermions w
 ith an isotropic spin distribution. We use the Raychaudhuri equation and t
 he focussing condition for congruences for a collapsing distribution of mu
 ltiple species of fermions\, ignoring other interactions. We establish tha
 t a repulsive contribution can arise depending on how torsion couples with
  different chiralities. The effect of the interaction starts to dominate a
 s density increases\, accelerating or decelerating the collapse depending 
 on the torsional coupling constants of different fermions.\n\nBased on : S
 . G. Choudhury\, S. K. Maity\, and A. Lahiri. Torsional four-fermion inter
 action and the Raychaudhuri equation. Eur. Phys. J. C\, 84(12):1304\, (202
 4).\n\nhttps://indico.itp.ac.cn/event/417/contributions/2964/
LOCATION:
URL:https://indico.itp.ac.cn/event/417/contributions/2964/
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