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  • Letter
  • Open Access

Emergent dark energy from unparticles

Michał Artymowski1,2, Ido Ben-Dayan1, and Utkarsh Kumar1

  • 1Physics Department, Ariel University, Ariel 40700
  • 2Department of Mathematics and Natural Sciences, College of Science, Cardinal Stefan Wyszynski University, Dewajtis 5, 01-815 Warsaw, Poland

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Phys. Rev. D 103, L121303 – Published 11 June, 2021

DOI: https://doi.org/10.1103/PhysRevD.103.L121303

Abstract

A limiting temperature of a species can cause the Universe to asymptote to it yielding a de-Sitter (dS) phase due to macroscopic emergent behavior. The limiting temperature is generic for theories slightly shifted from their conformal point. We demonstrate such behavior in the example of unparticles/Banks-Zaks theory. The unparticles behave like radiation at high energies reducing the Hubble tension and a cosmological constant at low energies yielding a model that follows closely Λ cold dark matter model but due to collective phenomenon. It is technically natural and avoids the no-dS conjecture. The model is free of the coincidence and initial conditions problems, scalar fields, and modified gravity.

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Phys. Rev. D 103, L121303– Published 11 June, 2021
  • Received 18 October 2020
  • Accepted 3 May 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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