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Multi-axion like description of the dark sector in light of the Hubble and σ₈ tensions

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arxiv 2501.08391 v2 pith:EAILVV6I submitted 2025-01-14 astro-ph.CO gr-qchep-phhep-th

Multi-axion like description of the dark sector in light of the Hubble and σ₈ tensions

classification astro-ph.CO gr-qchep-phhep-th
keywords hubblesigmadarklambdamodelsectortensionsaxion-like
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Local methods of direct determination of the Hubble constant and $\sigma_8$ seem to conflict with the predictions made from the cosmic microwave background and $\Lambda$CDM. We propose a proof-of-concept model that models portions of the dark sector as several coupled axion-like fields, resulting in both early and late time departures from $\Lambda$CDM. We determine that the model successfully eliminates both the Hubble and $\sigma_8$ tensions, while remaining consistent with both the DESI survey and the BAO sound horizon.

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