Fuzzy Euclidean wormholes in de Sitter space
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 Wickrotation to the Lorentzian signatures. Furthermore, we prefer wormholes for some parameters, rather than HawkingMoss instantons, and hence wormholes can be more fundamental than HawkingMoss 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.
 Authors:

^{[1]};
^{[2]};
^{[3]}
 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
 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
 National Taiwan Univ., Taipei (Taiwan). Leung Center for Cosmology and Particle Astrophysics
 Publication Date:
 Grant/Contract Number:
 AC0276SF00515
 Type:
 Accepted Manuscript
 Journal Name:
 Journal of Cosmology and Astroparticle Physics
 Additional Journal Information:
 Journal Volume: 2017; Journal Issue: 07; Journal ID: ISSN 14757516
 Publisher:
 Institute of Physics (IOP)
 Research Org:
 SLAC National Accelerator Lab., Menlo Park, CA (United States)
 Sponsoring Org:
 USDOE
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS
 OSTI Identifier:
 1389546
Chen, Pisin, Hu, YaoChieh, and Yeom, Donghan. Fuzzy Euclidean wormholes in de Sitter space. United States: N. p.,
Web. doi:10.1088/14757516/2017/07/001.
Chen, Pisin, Hu, YaoChieh, & Yeom, Donghan. Fuzzy Euclidean wormholes in de Sitter space. United States. doi:10.1088/14757516/2017/07/001.
Chen, Pisin, Hu, YaoChieh, and Yeom, Donghan. 2017.
"Fuzzy Euclidean wormholes in de Sitter space". United States.
doi:10.1088/14757516/2017/07/001. https://www.osti.gov/servlets/purl/1389546.
@article{osti_1389546,
title = {Fuzzy Euclidean wormholes in de Sitter space},
author = {Chen, Pisin and Hu, YaoChieh and Yeom, Donghan},
abstractNote = {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 Wickrotation to the Lorentzian signatures. Furthermore, we prefer wormholes for some parameters, rather than HawkingMoss instantons, and hence wormholes can be more fundamental than HawkingMoss 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.},
doi = {10.1088/14757516/2017/07/001},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 07,
volume = 2017,
place = {United States},
year = {2017},
month = {7}
}