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SUMMARY:Gravitational waves induced by scalar perturbations in the early U
 niverse
DTSTART;VALUE=DATE-TIME:20221201T150000Z
DTEND;VALUE=DATE-TIME:20221201T153000Z
DTSTAMP;VALUE=DATE-TIME:20260619T051425Z
UID:indico-contribution-16@cern.ch
DESCRIPTION:Speakers: INOMATA\, Keisuke (University of Chicago)\nIn this t
 alk\, I will talk about two topics on GWs induced by scalar perturbations.
  \nOne is about the enhancement of induced GWs with a sudden reheating\, n
 amed the “Poltergeist mechanism”. When the universe experiences an ear
 ly matter-dominated era that ends with a sudden reheating\, the induced GW
 s are much enhanced due to fast oscillations of the scalar perturbations a
 fter the reheating. I will explain the essence of this mechanism. This par
 t will be based on arXiv:1904.12879\, 1904.12878\, 2003.10455.\nThe other 
 is about GWs induced by a heavy spectator field that starts to oscillate d
 uring inflation.  During the oscillation of the spectator field\, the spec
 tator field fluctuations can get resonantly amplified in some potentials. 
 I will show that these amplified fluctuations can induce large GWs\, which
  could be investigated by future gravitational wave observations. This par
 t will be based on arXiv:2203.04974.\n\nhttp://indico.fuw.edu.pl/contribut
 ionDisplay.py?contribId=16&sessionId=3&confId=65
LOCATION:ONLINE ONLINE
URL:http://indico.fuw.edu.pl/contributionDisplay.py?contribId=16&sessionId
 =3&confId=65
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