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Exacerbating the Cosmological Constant Problem with Interacting Dark Energy Models.

M C David Marsh1

  • 1Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 0WA, United Kingdom.

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Interacting dark energy models may worsen the cosmological constant problem. Current string theory vacuum estimates are too small for these models to solve it anthropically, but future observations could rule out this solution.

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Area of Science:

  • Cosmology
  • Theoretical Physics
  • String Theory

Background:

  • Cosmological surveys aim to understand the Universe's expansion and dark energy.
  • Phenomenological dark energy models do not resolve the cosmological constant problem (CCP) and can exacerbate it.

Purpose of the Study:

  • To investigate interacting dark energy models and their implications for the CCP.
  • To assess if current string theory vacuum estimates are sufficient for anthropic solutions to the CCP within these models.

Main Methods:

  • Analysis of interacting dark energy models where dark matter masses depend on the dark energy sector.
  • Comparison of model requirements with current estimates of flux vacua in string theory (N_{vac}∼O(10^{272 000})).

Main Results:

  • Interacting dark energy models can significantly worsen the CCP.
  • The estimated number of string theory vacua is insufficient for certain interacting dark energy models to solve the CCP anthropically.

Conclusions:

  • Interacting dark energy models present observational signatures detectable by future gamma-ray observatories.
  • These observations could potentially rule out the anthropic solution to the CCP in theories with a finite number of vacua.