Obstructions to Bell CMB experiments

We present a general and systematic study of how a Bell experiment on the cosmic microwave background could be carried out. We introduce different classes of pseudo-spin operators and show that, if the system is placed in a two-mode squeezed state as inflation predicts, they all lead to a violation...

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Bibliographic Details
Published in:Physical review. D 2017-09, Vol.96 (6), Article 063501
Main Authors: Martin, Jérôme, Vennin, Vincent
Format: Article
Language:English
Subjects:
Bell's inequality
Big Bang theory
Cosmic microwave background
General Physics
General Relativity and Quantum Cosmology
High Energy Physics - Theory
Obstructions
Physics
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Summary:We present a general and systematic study of how a Bell experiment on the cosmic microwave background could be carried out. We introduce different classes of pseudo-spin operators and show that, if the system is placed in a two-mode squeezed state as inflation predicts, they all lead to a violation of the Bell inequality. However, we also discuss the obstacles that one faces in order to realize this program in practice and show that they are probably insurmountable. We suggest alternative methods that could reveal the quantum origin of cosmological structures without relying on Bell experiments.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.96.063501