Evidence of the fine-structure constant in H0-tension

Modern precision measurements on Hubble expansion H (z) introduce two integral constraints on background models derived from early and late-time cosmology, based on Planck observations of the BAO and, respectively, H-0, here normalized to ACDM. For H(z) coupled to A = (1 - q)H-2 of zero wave-number modes of cosmological spacetime with deceleration parameter q(z), we infer a coupling constant g < 1 for H-0 in tension with ACDM. Results from the Local Distance Ladder give g similar or equal to 1 - xi alpha with xi = 0.49 +/- 0.10. This result appears natural upon identifying H-0-tension with breaking of T-duality in the Friedmann scale factor a(t) to the same order. (C) 2021 Published by Elsevier B.V.

Automated summary

Modern precision measurements on Hubble expansion introduce integral constraints on background models derived from early and late-time cosmology, revealing a potential discrepancy between H-0 and the ACDM model, possibly related to the breaking of T-duality in the Friedmann scale factor.