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29 March 2024
 
  » arxiv » 2006.0244

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Hubble Sinks In The Low-Redshift Swampland
Aritra Banerjee ; Haiying Cai ; Lavinia Heisenberg ; Eoin Ó Colgáin ; M. M. Sheikh-Jabbari ; Tao Yang ;
Date 30 May 2020
AbstractLocal determinations of the Hubble constant $H_0$ favour a higher value than Planck based on CMB and $Lambda$CDM. Through a model-independent expansion, we show that low redshift ($z lesssim 0.7$) data comprising baryon acoustic oscillations (BAO), cosmic chronometers and Type Ia supernovae has a preference for Quintessence models that lower $H_0$ relative to $Lambda$CDM. 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 $H_0$ from sinking in the string theory Swampland.
Source arXiv, 2006.0244
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