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Hubble sinks in the low-redshift swampland

2021; American Physical Society; Volume: 103; Issue: 8 Linguagem: Inglês

10.1103/physrevd.103.l081305

2470-0037

Aritra Banerjee, Huabing Cai, Lavinia Heisenberg, E. Ó Colgáin, M. M. Sheikh-Jabbari, Tao Yang,

Galaxies: Formation, Evolution, Phenomena

The cosmological standard model ($\mathrm{\ensuremath{\Lambda}}$CDM) has recently come under pressure from measurements of the Hubble constant ${H}_{0}$, and theoretically from the swampland conjecture that emphasizes consistency with quantum gravity. The authors sweep through the typical class of string theory motivated dark-energy models, (coupled) quintessence with a clever expansion in low redshift and show that these models worsen the ${H}_{0}$ tension, but they also point to a gateway that might be tested with future $21c\phantom{\rule{0}{0ex}}m$ observations.