A background-independent algebra in quantum gravity

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We propose an algebra of operators along an observer’s worldline as a background-independent algebra in quantum gravity. In that context, it is natural to think of the Hartle-Hawking no boundary state as a universal state of maximum entropy, and to define entropy in terms of the relative entropy with this state. In the case that the only spacetimes considered correspond to de Sitter vacua with different values of the cosmological constant, this definition leads to sensible results.

Original languageEnglish (US)
Article number77
JournalJournal of High Energy Physics
Issue number3
StatePublished - Mar 2024
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


  • Cosmological models
  • de Sitter space


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