Multiverse in an inverted island

Langhoff, Kevin; Murdia, Chitraang; Nomura, Yasunori

doi:10.1103/PhysRevD.104.086007

Title: Multiverse in an inverted island

Journal Article · Mon Oct 04 00:00:00 EDT 2021 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.104.086007· OSTI ID:1823684

Langhoff, Kevin; Murdia, Chitraang;

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: 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)

Grant/Contract Number:: AC02-05CH11231; SC0019380; JP20H05850; JP20H05860

OSTI ID:: 1823684

Alternate ID(s):: OSTI ID: 1901542

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 104 Journal Issue: 8; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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