TY - JOUR

T1 - Cosmological implications of quantum entanglement in the multiverse

AU - Kanno, Sugumi

N1 - Funding Information:
I would like to thank Misao Sasaki and Jiro Soda for valuable discussions, suggestions and comments. I would also like to thank Jose Blanco-Pillado, Jaume Garriga, Takahiro Tanaka and Alex Vilenkin for careful reading of the draft, and for fruitful suggestions and comments. This work was supported by Ikerbasque, Basque Foundation for Science .
Publisher Copyright:
© 2015 The Author.

PY - 2015/12/17

Y1 - 2015/12/17

N2 - We explore the cosmological implications of quantum entanglement between two causally disconnected universes in the multiverse. We first consider two causally separated de Sitter spaces with a state which is initially entangled. We derive the reduced density matrix of our universe and compute the spectrum of vacuum fluctuations. We then consider the same system with an initially non-entangled state. We find that due to quantum interference scale dependent modulations may enter the spectrum for the case of initially non-entangled state. This gives rise to the possibility that the existence of causally disconnected universes may be experimentally tested by analyzing correlators in detail.

AB - We explore the cosmological implications of quantum entanglement between two causally disconnected universes in the multiverse. We first consider two causally separated de Sitter spaces with a state which is initially entangled. We derive the reduced density matrix of our universe and compute the spectrum of vacuum fluctuations. We then consider the same system with an initially non-entangled state. We find that due to quantum interference scale dependent modulations may enter the spectrum for the case of initially non-entangled state. This gives rise to the possibility that the existence of causally disconnected universes may be experimentally tested by analyzing correlators in detail.

UR - http://www.scopus.com/inward/record.url?scp=84946098488&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84946098488&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2015.10.050

DO - 10.1016/j.physletb.2015.10.050

M3 - Article

AN - SCOPUS:84946098488

VL - 751

SP - 316

EP - 320

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

ER -