Bell inequality and its application to cosmology

Sugumi Kanno, Jiro Soda

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


One of the cornerstones of inflationary cosmology is that primordial density fluctuations have a quantum mechanical origin. However, most physicists consider that such quantum mechanical effects disappear in CMB data due to decoherence. In this conference report, we show that the violation of Bell inequalities in an initial state of our universe increases exponentially with the number of modes to measure in inflation. This indicates that some evidence that our universe has a quantum mechanical origin may survive in CMB data, even if quantum entanglement decays exponentially afterward due to decoherence.

Original languageEnglish
Article number99
Issue number4
Publication statusPublished - Dec 12 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics


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