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SUMMARY:Enrico Pajer (Cambridge University)
DTSTART:20210407T160000Z
DTEND:20210407T170000Z
DTSTAMP:20260423T023937Z
UID:CMU-TP/22
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CMU-TP/22/">
 A timeless History of Time</a>\nby Enrico Pajer (Cambridge University) as 
 part of Carnegie Mellon theoretical physics\n\n\nAbstract\nWe have overwhe
 lming evidence that the distribution of everything on very large scales is
  of primorial origin. According to the leading paradigm of inflation\, the
  statistics of these primordial perturbations can be traced back to correl
 ators of quantum fields on a curved quasi-de Sitter spacetime. This gives 
 us the unique opportunity to probe the fundamental laws of physics at very
  high energies as well as the perturbative regime of quantum gravity.\nUnf
 ortunately\, due to the creativity of theorists and the paucity of data ab
 out the primordial universe\, there is a huge number of models compatible 
 with all measurements\, featuring a wide variety of mechanisms\, symmetrie
 s\, and spectra of particles.The reason can be traced back to the fact tha
 t we don't observe the time evolution during inflation\, but only its fina
 l outcome.\nIn this talk I will report on the recent progress in developin
 g a completely new "bootstrap" approach to derive predictions from the ver
 y early universe that make no reference to time and the un-observable time
  evolution. The bootstrap approach builds directly upon the fundamental pi
 llars of physics\, namely unitarity\, locality and symmetries and is highl
 y model independent. I will show how these principles can be used to deriv
 e many classical and new inflationary predictions associated with primordi
 al non-Gaussianity in a way that is both computationally simpler and conce
 ptually more transparent.\n
LOCATION:https://researchseminars.org/talk/CMU-TP/22/
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