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Title: Fuzzy Euclidean wormholes in de Sitter space

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [1];  [2];  [3]
  1. National Taiwan Univ., Taipei (Taiwan). Leung Center for Cosmology and Particle Astrophysics, Dept. of Physics, Graduate Inst. of Astrophysics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology
  2. National Taiwan Univ., Taipei (Taiwan). Leung Center for Cosmology and Particle Astrophysics, Dept. of Physics, Graduate Inst. of Astrophysics; Stockholm Univ. (Sweden). Dept. of Physics
  3. National Taiwan Univ., Taipei (Taiwan). Leung Center for Cosmology and Particle Astrophysics
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Here, we investigate Euclidean wormholes in Einstein gravity with a massless scalar field in de Sitter space. Euclidean wormholes are possible due to the analytic continuation of the time as well as complexification of fields, where we need to impose the classicality after the Wick-rotation to the Lorentzian signatures. Furthermore, we prefer wormholes for some parameters, rather than Hawking-Moss instantons, and hence wormholes can be more fundamental than Hawking-Moss type instantons. Euclidean wormholes can be interpreted in three ways: (1) classical big bounce, (2) either tunneling from a small to a large universe or a creation of a collapsing and an expanding universe from nothing, and (3) either a transition from a contracting to a bouncing phase or a creation of two expanding universes from nothing. These various interpretations shed some light on challenges of singularities. In addition, these will help to understand tensions between various kinds of quantum gravity theories.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1389546
Journal Information:
Journal of Cosmology and Astroparticle Physics, Vol. 2017, Issue 07; ISSN 1475-7516
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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Cited By (5)

Why concave rather than convex inflaton potential? journal October 2018
Quantum creation of traversable wormholes ex nihilo in Gauss–Bonnet-dilaton gravity journal June 2019
On the Geometry of No-Boundary Instantons in Loop Quantum Cosmology journal January 2019
Why concave rather than convex inflaton potential? text January 2017
On the geometry of no-boundary instantons in loop quantum cosmology preprint January 2018

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79 ASTRONOMY AND ASTROPHYSICS