Hubble Sinks In The Low-Redshift Swampland. (arXiv:2006.00244v3 [astro-ph.CO] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Banerjee_A/0/1/0/all/0/1">Aritra Banerjee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cai_H/0/1/0/all/0/1">Haiying Cai</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Heisenberg_L/0/1/0/all/0/1">Lavinia Heisenberg</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Colgain_E/0/1/0/all/0/1">Eoin Ó Colgáin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sheikh_Jabbari_M/0/1/0/all/0/1">M. M. Sheikh-Jabbari</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yang_T/0/1/0/all/0/1">Tao Yang</a>
Local 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.
Local 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.
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