Axion baryogenesis puts a new spin on the Hubble tension
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916253820518400 |
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| author | Co, Raymond T. Fernandez, Nicolas Ghalsasi, Akshay Harigaya, Keisuke Shelton, Jessie |
| author_facet | Co, Raymond T. Fernandez, Nicolas Ghalsasi, Akshay Harigaya, Keisuke Shelton, Jessie |
| contents | We show that a rotating axion field that makes a transition from a matter-like equation of state to a kination-like equation of state around the epoch of recombination can significantly ameliorate the Hubble tension, i.e., the discrepancy between the determinations of the present-day expansion rate $H_0$ from observations of the cosmic microwave background on one hand and Type Ia supernovae on the other. We consider a specific, UV-complete model of such a rotating axion and find that it can relax the Hubble tension without exacerbating tensions in determinations of other cosmological parameters, in particular the amplitude of matter fluctuations $S_8$. We subsequently demonstrate how this rotating axion model can also generate the baryon asymmetry of our universe, by introducing a coupling of the axion field to right-handed neutrinos. This baryogenesis model predicts heavy neutral leptons that are most naturally within reach of future lepton colliders, but in finely-tuned regions of parameter space may also be accessible at the high-luminosity LHC and the beam dump experiment SHiP. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_12268 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Axion baryogenesis puts a new spin on the Hubble tension Co, Raymond T. Fernandez, Nicolas Ghalsasi, Akshay Harigaya, Keisuke Shelton, Jessie High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We show that a rotating axion field that makes a transition from a matter-like equation of state to a kination-like equation of state around the epoch of recombination can significantly ameliorate the Hubble tension, i.e., the discrepancy between the determinations of the present-day expansion rate $H_0$ from observations of the cosmic microwave background on one hand and Type Ia supernovae on the other. We consider a specific, UV-complete model of such a rotating axion and find that it can relax the Hubble tension without exacerbating tensions in determinations of other cosmological parameters, in particular the amplitude of matter fluctuations $S_8$. We subsequently demonstrate how this rotating axion model can also generate the baryon asymmetry of our universe, by introducing a coupling of the axion field to right-handed neutrinos. This baryogenesis model predicts heavy neutral leptons that are most naturally within reach of future lepton colliders, but in finely-tuned regions of parameter space may also be accessible at the high-luminosity LHC and the beam dump experiment SHiP. |
| title | Axion baryogenesis puts a new spin on the Hubble tension |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2405.12268 |