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Possible origin of α-vacua as the initial state of the Universe

Journal Article · · Physical Review. D.
 [1];  [2];  [3];  [4]
  1. National Taiwan Univ., Taipei (Taiwan); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States)
  2. National Taiwan Univ., Taipei (Taiwan)
  3. Pusan National Univ., Busan (Korea, Republic of)
  4. National Taiwan Univ., Taipei (Taiwan); Pusan National Univ., Busan (Korea, Republic of)
+ Show Author Affiliations
We investigate the cosmological observables using the Euclidean path integral approach. Specifically, we study both the no-boundary compact instantons scenario and the Euclidean wormholes scenario that can induce the creation of two universes from nothing. It is known that perturbations associated with the no-boundary scenario can only be consistent with the Bunch-Davies vacuum. Here, in this study, we demonstrate that the Euclidean wormholes can allow for a de Sitter invariant vacuum, the so-called α-vacua state, where the Bunch-Davies vacuum is a special case. This therefore provides the α-vacua a geometrical origin. As an aside, we discuss a subtle phase issue when considering the power spectrum related to α-vacua in the closed universe framework.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
National Research Foundation of Korea (NRF); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
Other Award/Contract Number:
2021R1C1C1008622
2021R1A4A5031460
OSTI ID:
2575460
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 8 Vol. 111; ISSN 2470-0010; ISSN 2470-0029
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Primordial Cosmology
  • Baumann, Daniel
  • Proceedings of Theoretical Advanced Study Institute Summer School 2017 "Physics at the Fundamental Frontier" — PoS(TASI2017) https://doi.org/10.22323/1.305.0009
conference September 2018

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