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.
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U2 - 10.1016/j.physletb.2015.10.050
DO - 10.1016/j.physletb.2015.10.050
M3 - Article
AN - SCOPUS:84946098488
SN - 0370-2693
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
ER -