Abstract
We show that big bang cosmology implies a high degree of entanglement of particles in the universe. In fact, a typical particle is entangled with many particles far outside our horizon. However, the entanglement is spread nearly uniformly so that two randomly chosen particles are unlikely to be directly entangled with each other – the reduced density matrix describing any pair is likely to be separable.
Highlights
Follow this and additional works at: http://digitalcommons.chapman.edu/scs_articles Part of the Cosmology, Relativity, and Gravity Commons, and the Quantum Physics Commons
We show that big bang cosmology implies a high degree of entanglement of particles in the universe
We know from big bang cosmology that our universe was in thermal equilibrium at early times, and we believe, due to the uniformity of the cosmic microwave background, that regions which today are out of causal contact were once in equilibrium with each other
Summary
Comments NOTICE: this is the author’s version of a work that was accepted for publication in Physics Letters B. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Physics Letters B, volume 718, issue 2, in 2012. This article is available at Chapman University Digital Commons: http://digitalcommons.chapman.edu/scs_articles/263
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