BEGIN:VCALENDAR
PRODID:-//eluceo/ical//2.0/EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VEVENT
UID:1925e92c1754b88c0b366863801a1d5b
DTSTAMP:20260406T093618Z
SUMMARY:Particle Cosmology Seminar- Nadine Nussbaumer
DESCRIPTION:Light scalars in de Sitter: the stochastic story\nLight\, polyn
 omially self-interacting scalars in de Sitter notoriously\ngenerate infrar
 ed (IR) divergences: on superhorizon scales\, their\nfluctuations grow so 
 large that perturbation theory breaks down. We\naddress this problem using
  non-perturbative techniques from stochastic\ninflation\, by encoding the 
 superhorizon dynamics in a probability\ndistribution involving composite o
 perators of the light scalar. We find\nthat these composites behave as lat
 e-time conformal primaries\, with\ntheir position-space four-point functio
 n collapsing to a strikingly\nsimple power law. We conjecture a new physic
 al picture: light\ninteracting scalars in de Sitter effectively hadronize 
 on superhorizon\nscales\, producing a tower of composite states. We then e
 xplore whether\nthis emergent spectrum can be captured within a weakly cou
 pled effective\nfield theory\, which would amount to recasting the stochas
 tic scalar\nIR-dynamics in terms of new\, effective degrees of freedom.
URL:https://www.imperial.ac.uk/events/200394/particle-cosmology-seminar-31/
DTSTART;TZID=Europe/London:20251031T120000
DTEND;TZID=Europe/London:20251031T130000
LOCATION:H503\, Huxley Building\, South Kensington Campus\, Imperial Colleg
 e London\, London\, SW7 2AZ\, United Kingdom
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/London
BEGIN:STANDARD
DTSTART:20251031T120000
TZNAME:GMT
TZOFFSETTO:+0000
TZOFFSETFROM:+0000
END:STANDARD
END:VTIMEZONE
END:VCALENDAR