Spacetime equals entanglement
We study the Hilbert space structure of classical spacetimes under the assumption that entanglement in holographic theories determines semiclassical geometry. We show that this simple assumption has profound implications; for example, a superposition of classical spacetimes may lead to another classical spacetime. Despite its unconventional nature, this picture admits the standard interpretation of superpositions of welldefined semiclassical spacetimes in the limit that the number of holographic degrees of freedom becomes large. We illustrate these ideas using a model for the holographic theory of cosmological spacetimes.
 Authors:

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;
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 Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); The Univ. of Tokyo Institutes for Advanced Study, Kashiwa (Japan)
 Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
 Publication Date:
 Grant/Contract Number:
 AC0205CH11231
 Type:
 Published Article
 Journal Name:
 Physics Letters. Section B
 Additional Journal Information:
 Journal Volume: 763; Journal Issue: C; Journal ID: ISSN 03702693
 Publisher:
 Elsevier
 Research Org:
 Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
 Sponsoring Org:
 USDOE Office of Science (SC), High Energy Physics (HEP) (SC25)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
 OSTI Identifier:
 1329723
 Alternate Identifier(s):
 OSTI ID: 1413712
Nomura, Yasunori, Salzetta, Nico, Sanches, Fabio, and Weinberg, Sean J. Spacetime equals entanglement. United States: N. p.,
Web. doi:10.1016/j.physletb.2016.10.045.
Nomura, Yasunori, Salzetta, Nico, Sanches, Fabio, & Weinberg, Sean J. Spacetime equals entanglement. United States. doi:10.1016/j.physletb.2016.10.045.
Nomura, Yasunori, Salzetta, Nico, Sanches, Fabio, and Weinberg, Sean J. 2016.
"Spacetime equals entanglement". United States.
doi:10.1016/j.physletb.2016.10.045.
@article{osti_1329723,
title = {Spacetime equals entanglement},
author = {Nomura, Yasunori and Salzetta, Nico and Sanches, Fabio and Weinberg, Sean J.},
abstractNote = {We study the Hilbert space structure of classical spacetimes under the assumption that entanglement in holographic theories determines semiclassical geometry. We show that this simple assumption has profound implications; for example, a superposition of classical spacetimes may lead to another classical spacetime. Despite its unconventional nature, this picture admits the standard interpretation of superpositions of welldefined semiclassical spacetimes in the limit that the number of holographic degrees of freedom becomes large. We illustrate these ideas using a model for the holographic theory of cosmological spacetimes.},
doi = {10.1016/j.physletb.2016.10.045},
journal = {Physics Letters. Section B},
number = C,
volume = 763,
place = {United States},
year = {2016},
month = {10}
}