On the inevitable lightness of vacuum

Laurent Freidel, Jerzy Kowalski-Glikman, Robert G. Leigh, Djordje Minic

Research output: Contribution to journalArticlepeer-review


In this essay, we present a new understanding of the cosmological constant problem, built upon the realization that the vacuum energy density can be expressed in terms of a phase space volume. We introduce a UV-IR regularization which implies a relationship between the vacuum energy and entropy. Combining this insight with the holographic bound on entropy then yields a bound on the cosmological constant consistent with observations. It follows that the universe is large, and the cosmological constant is naturally small, because the universe is filled with a large number of degrees of freedom.

Original languageEnglish (US)
Article number2342004
JournalInternational Journal of Modern Physics D
Issue number14
StatePublished - 2023


  • Cosmological constant
  • holography
  • quantum field theory

ASJC Scopus subject areas

  • Mathematical Physics
  • Astronomy and Astrophysics
  • Space and Planetary Science


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