H0 tensions in cosmology and axion pseudocycles in the stringy universe

TL;DR

This paper explores how axion dark matter from string theory can cause variations in the H0 tension by considering the evolution of non-trivial cycles in the early universe, offering a novel explanation for the discrepancy.

Contribution

It introduces a string-theoretic framework where axion pseudocycles evolve over time, potentially resolving the H0 tension through their impact on the axion potential.

Findings

Axion pseudocycles can change triviality status over cosmic time.

Variations in the axion potential may account for H0 tension.

String theory provides a natural context for these phenomena.

Abstract

The tension between early and late H0 is revised in the context of axion dark matter arising naturally from string theoretical integrations of antisymmetric tensor fields over non-trivial cycles. Certain early universe cycles may appear non-trivial from the perspective of a homology analysis focused on the early universe, while they may become trivial, when analysed from the perspective of a homology theory reaching out to lower energies and later times. Such phenomena can introduce variations in the axion potential that would explain the observed H0 tension.