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SUMMARY:Vacuum restructuring and scalar particle production in a closed is
 otropic universe
DTSTART;VALUE=DATE-TIME:20261030T063000Z
DTEND;VALUE=DATE-TIME:20261030T064500Z
DTSTAMP;VALUE=DATE-TIME:20261102T023837Z
UID:indico-contribution-6276@cern.ch
DESCRIPTION:Speakers: Roger Ivan Ayala Oña (Southern Federal University)\
 , Tatyana Shestakova (Department of Theoretical and Computational Physics\
 , Southern Federal University)\nWe study scalar particle production in a c
 losed isotropic universe within the extended phase space approach. Unlike 
 the treatments in which the gravitational field is treated classically\, w
 e quantize the coupled gravitational and matter degrees of freedom and der
 ive the Schrodinger equation for the wave function of the Universe\, inclu
 ding perturbative contributions associated with a slight deviation from co
 nformal coupling. We start from the effective action for scalar and spinor
  fields interacting with gravity\, with the spinor field introduced to can
 cel vacuum divergences arising in the theory. The gravitational degree of 
 freedom is described in the coordinate representation\, while the matter m
 odes are treated in the holomorphic representation. We then analyze partic
 le-production processes as perturbative transitions between quantum states
 . Unlike the usual path-integral treatment\, where perturbations are assum
 ed to be independent of velocities\, the perturbative interaction in our m
 odel depends on the time derivative of the scale factor. We compare this d
 escription with the conventional canonical approach based on Bogoliubov tr
 ansformations and discuss the relation between the two formulations.\n\nht
 tps://indico.particle.mephi.ru/event/626/contributions/6276/
LOCATION: Conference Hall 4
URL:https://indico.particle.mephi.ru/event/626/contributions/6276/
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