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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2408.09521 |
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| _version_ | 1866917003741102080 |
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| author | Kochappan, Joby Yin, Lu Lee, Bum-Hoon Ghosh, Tuhin |
| author_facet | Kochappan, Joby Yin, Lu Lee, Bum-Hoon Ghosh, Tuhin |
| contents | We test the $n$=3 Ultralight Axion-like model of Early Dark Energy (EDE) with the observationsof the $EB$ mode of the cosmic microwave background (CMB) radiation, and local expansion rate measurements. Our results show that the shape of the CMB $EB$ angular power spectrum is sensitive to the background cosmological parameters. We run Markov chain Monte Carlo (MCMC) simulations to fit the $Λ$CDM + EDE parameters simultaneously, and find that the EDE model with $n$=3 can provide a good fit to the observed CMB $EB$ spectra, consistent with the locally measured value of the Hubble constant. Our result is the first to show that axion-like EDE can provide a unified explanation for the observed cosmic birefringence and the Hubble tension. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_09521 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observational evidence for Early Dark Energy as a unified explanation for Cosmic Birefringence and the Hubble tension Kochappan, Joby Yin, Lu Lee, Bum-Hoon Ghosh, Tuhin Cosmology and Nongalactic Astrophysics We test the $n$=3 Ultralight Axion-like model of Early Dark Energy (EDE) with the observationsof the $EB$ mode of the cosmic microwave background (CMB) radiation, and local expansion rate measurements. Our results show that the shape of the CMB $EB$ angular power spectrum is sensitive to the background cosmological parameters. We run Markov chain Monte Carlo (MCMC) simulations to fit the $Λ$CDM + EDE parameters simultaneously, and find that the EDE model with $n$=3 can provide a good fit to the observed CMB $EB$ spectra, consistent with the locally measured value of the Hubble constant. Our result is the first to show that axion-like EDE can provide a unified explanation for the observed cosmic birefringence and the Hubble tension. |
| title | Observational evidence for Early Dark Energy as a unified explanation for Cosmic Birefringence and the Hubble tension |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2408.09521 |