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SUMMARY:Gravitational Waves from Reheating: Messengers of the Pre-BBN Univ
 erse
DTSTART:20250714T120000Z
DTEND:20250714T140000Z
DTSTAMP:20260827T212000Z
UID:indico-event-1002@indico.hiskp.uni-bonn.de
DESCRIPTION:Speakers: Yong Xu\n\nThe well-established theory of Big Bang N
 ucleosynthesis (BBN) implies that our  universe must have been thermalize
 d prior to this epoch. However\, cosmic inflation leaves the universe cold
  and dominated by vacuum energy at its end. The subsequent reheating phase
 \, which connects inflation to the radiation-dominated era preceding BBN\,
  plays a pivotal role in shaping the universe’s thermal history. This tr
 ansition impacts key processes such as dark matter production\, cosmic pha
 se transitions\, and baryogenesis. Despite its significance\, the reheatin
 g era remains one of the most observationally challenging epochs in cosmol
 ogy.  In this talk\, I will present recent advances in the study of stoch
 astic gravitational waves (GWs) generated directly during reheating throug
 h graviton emission. I will demonstrate how the resulting GW background\, 
 as part of the landscape of cosmic messengers\, offers a unique and direct
  probe of the pre-BBN universe. \n\nhttps://indico.hiskp.uni-bonn.de/even
 t/1002/
URL:https://indico.hiskp.uni-bonn.de/event/1002/
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