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Paper   IPM / Astronomy / 17273
School of Astronomy
  Title:   Cosmological constant problem on the horizon
  Author(s):  H. Firouzjahi
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  106
  Year:  2022
  Supported by:            ipm IPM
We revisit the quantum cosmological constant problem and highlight the important roles played by the dS horizon of zero point energy. We argue that fields which are light enough to have dS horizon of zero point energy comparable to the FLRW Hubble radius are the main contributors to dark energy. On the other hand, the zero point energy of heavy fields develop nonlinearities on sub-Hubble scales and can not contribute to dark energy. We speculate that our proposal may provide a resolution for both the old and new cosmological constant problems by noting that there exists a field, the (lightest) neutrino, which happens to have a mass comparable to the present background photon temperature. The proposal predicts multiple transient periods of dark energy in early and late expansion history of the universe yielding to a higher value of the current Hubble expansion rate which can resolve the H0 tension problem.

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