[P]article detectors in De Sitter space respond as if they are immersed in a bath of thermal radiation… — Paul Davies

[P]article detectors in De Sitter space respond as if they are immersed in a bath of thermal radiation. However, the stress energy momentum tensor in De Sitter space is not that of thermal radiation. It's just a renormalization of the cosmological constant. So there's something a bit funny about the thermal nature of De Sitter space, and I've been interested in whether you can mine that thermal stuff...

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