Multiverse in an inverted island
Abstract
We study the redundancies in the global spacetime description of the eternally inflating multiverse using the quantum extremal surface prescription. We argue that a sufficiently large spatial region in a bubble universe has an entanglement island surrounding it. Consequently, the semiclassical physics of the multiverse, which is all we need to make cosmological predictions, can be fully described by the fundamental degrees of freedom associated with certain finite spatial regions. The island arises due to mandatory collisions with collapsing bubbles, whose big crunch singularities indicate redundancies of the global spacetime description. The emergence of the island and the resulting reduction of independent degrees of freedom provides a regularization of infinities which caused the cosmological measure problem.
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); Ministry of Education, Culture, Sports, Science and Technology (MEXT); Japan Society for the Promotion of Science (JSPS)
- OSTI Identifier:
- 1823684
- Alternate Identifier(s):
- OSTI ID: 1901542
- Grant/Contract Number:
- AC02-05CH11231; SC0019380; JP20H05850; JP20H05860
- Resource Type:
- Published Article
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Name: Physical Review D Journal Volume: 104 Journal Issue: 8; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; cosmology; gauge-gravity dualities; quantum gravity
Citation Formats
Langhoff, Kevin, Murdia, Chitraang, and Nomura, Yasunori. Multiverse in an inverted island. United States: N. p., 2021.
Web. doi:10.1103/PhysRevD.104.086007.
Langhoff, Kevin, Murdia, Chitraang, & Nomura, Yasunori. Multiverse in an inverted island. United States. https://doi.org/10.1103/PhysRevD.104.086007
Langhoff, Kevin, Murdia, Chitraang, and Nomura, Yasunori. Mon .
"Multiverse in an inverted island". United States. https://doi.org/10.1103/PhysRevD.104.086007.
@article{osti_1823684,
title = {Multiverse in an inverted island},
author = {Langhoff, Kevin and Murdia, Chitraang and Nomura, Yasunori},
abstractNote = {We study the redundancies in the global spacetime description of the eternally inflating multiverse using the quantum extremal surface prescription. We argue that a sufficiently large spatial region in a bubble universe has an entanglement island surrounding it. Consequently, the semiclassical physics of the multiverse, which is all we need to make cosmological predictions, can be fully described by the fundamental degrees of freedom associated with certain finite spatial regions. The island arises due to mandatory collisions with collapsing bubbles, whose big crunch singularities indicate redundancies of the global spacetime description. The emergence of the island and the resulting reduction of independent degrees of freedom provides a regularization of infinities which caused the cosmological measure problem.},
doi = {10.1103/PhysRevD.104.086007},
journal = {Physical Review D},
number = 8,
volume = 104,
place = {United States},
year = {2021},
month = {10}
}
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