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SUMMARY:Flavio Riccardi: "Quantum fields in de Sitter space and inflation:
  horizons\, quasinormal modes\, thermality\, and renormalization"
DTSTART:20260311T113000Z
DTEND:20260311T130000Z
DTSTAMP:20260506T092200Z
UID:indico-event-51309@agenda.infn.it
DESCRIPTION:The talk is intended as a pedagogical introduction to selected
  aspects of quantum field theory in curved spacetime\, with emphasis on th
 eir interplay with gravitational physics in cosmological backgrounds.\nIn 
 the first part\, I will discuss the thermal and dissipative properties of 
 quantum fields in de Sitter space\, stressing the role of horizons and de 
 Sitter isometries and clarifying the geometric origin of the associated th
 ermal behavior. I will also describe how observables defined at the future
  and past horizons of a static observer provide a useful probe of the phys
 ics inside the causal patch\, and how they lead to a natural notion of qua
 sinormal modes in interacting quantum field theories.\nIn the second part\
 , I will present a systematic framework for computing quantum corrections 
 in time-dependent cosmological geometries\, relevant for scalar perturbati
 ons and primordial gravitational waves. Particular emphasis will be placed
  on renormalization in curved spacetime\, the structure of local covariant
  counterterms\, and the comparison between different regularization prescr
 iptions.\n\nhttps://agenda.infn.it/event/51309/
URL:https://agenda.infn.it/event/51309/
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