Do zero-frequency modes contribute to the entropy?

Marcelo Schiffer, Jacob D. Bekenstein

Research output: Contribution to journalReview articlepeer-review

11 Scopus citations


Unruh's mixed state of a field with a zero-frequency mode, which purportedly contributes an arbitrarily large entropy for a given energy, is actually a mixture of pure states belonging to different systems, since the mean value of the scalar field is different for each pure state in the mixture. Considerations related to superfluidity support the idea that vanishing entropy is to be ascribed to a zero-frequency mode.

Original languageEnglish
Pages (from-to)3598-3599
Number of pages2
JournalPhysical Review D
Issue number10
StatePublished - 1990
Externally publishedYes


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