Not one bit of de Sitter information

Maulik Parikh, Jan Pieter Van Der Schaar

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We formulate the information paradox in de Sitter space in terms of the no-cloning principle of quantum mechanics. We show that energy conservation puts an upper bound on the maximum entropy available to any de Sitter observer. Combined with a general result on the average information in a quantum subsystem, this guarantees that an observer in de Sitter space cannot obtain even a single bit of information from the de Sitter horizon, thereby preventing any observable violations of the quantum no-cloning principle. The result supports the notion of observer complementarity.

Original languageEnglish (US)
Article number041
JournalJournal of High Energy Physics
Issue number9
StatePublished - Sep 1 2008
Externally publishedYes


  • DS vacua in string theory
  • Models of quantum gravity

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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