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SUMMARY:Vicharit Yingcharoenrat (SISSA)
DTSTART:20201209T170000Z
DTEND:20201209T180000Z
DTSTAMP:20260423T035732Z
UID:CMU-TP/21
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CMU-TP/21/">
 Beyond perturbation theory in inflation</a>\nby Vicharit Yingcharoenrat (S
 ISSA) as part of Carnegie Mellon theoretical physics\n\n\nAbstract\nIn thi
 s talk I will first discuss a motivation why one needs to go beyond pertur
 bation theory (PT) in inflation as going to the tail of the distribution o
 f the primordial fluctuations. Then I will propose that the way to go beyo
 nd PT is equivalent to performing a calculation in the semi-classical limi
 t. As an analogy\, I will show a simple calculation of the ground-state wa
 vefunction in the semi-classical limit for a quantum mechanical system. Af
 ter that\, I will move to a toy model of inflation which for simplicity in
 volves only derivative couplings. As a result\, the wavefunction of the Un
 iverse in this semi-classical limit exhibits a non-perturbative behaviour 
 for large coupling limit.\n
LOCATION:https://researchseminars.org/talk/CMU-TP/21/
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