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Paper   IPM / Physic / 16450
School of Physics
  Title:   Hubble Sinks In The Low-Redshift Swampland
1.  A. Banerjee
2.  H. Cai
3.  L. Heisenberg
4.  E. O Colgáin
5.  M.M. Sheikh-Jabbari
6.  T. Yang
  Status:   Published
  Journal: Phys. Rev. D
  No.:  8
  Vol.:  103
  Year:  2021
  Pages:   L081305
  Supported by:  IPM
Local determinations of the Hubble constant H0 favour a higher value than Planck based on CMB and ΛCDM. Through a model-independent expansion, we show that low redshift (z <~0.7) data comprising baryon acoustic oscillations (BAO), cosmic chronometers and Type Ia supernovae has a preference for Quintessence models that lower H0 relative to ΛCDM. In addition, we confirm that an exponential coupling to dark matter cannot alter this conclusion in the same redshift range. Our results leave open the possibility that a coupling in the matter-dominated epoch, potentially even in the dark ages, may yet save H0 from sinking in the string theory Swampland.

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