Early dark energy triggered by spacetime dynamics that encodes cosmic radiation-matter transition
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929235062423552 |
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| author | Jing, Changcheng Tian, Shuxun Zhu, Zong-Hong |
| author_facet | Jing, Changcheng Tian, Shuxun Zhu, Zong-Hong |
| contents | Early dark energy (EDE), introduced at the epoch of matter-radiation equality to alleviate the Hubble tension, has posed a new coincidence problem: why EDE appears at matter-radiation equality when their physics are completely unrelated? To solve this coincidence problem, we propose a new EDE model based on scalar-tensor gravity with the idea that EDE is triggered by spacetime dynamics that encodes cosmic radiation-matter transition. Our model can induce EDE naturally at matter-radiation equality without unnatural parameter tuning. Compared with other EDE models, a distinguishing feature of ours is that it can also induce a new energy component during cosmic matter-dark energy transition. This is testable with low-redshift observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_03684 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Early dark energy triggered by spacetime dynamics that encodes cosmic radiation-matter transition Jing, Changcheng Tian, Shuxun Zhu, Zong-Hong General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics Early dark energy (EDE), introduced at the epoch of matter-radiation equality to alleviate the Hubble tension, has posed a new coincidence problem: why EDE appears at matter-radiation equality when their physics are completely unrelated? To solve this coincidence problem, we propose a new EDE model based on scalar-tensor gravity with the idea that EDE is triggered by spacetime dynamics that encodes cosmic radiation-matter transition. Our model can induce EDE naturally at matter-radiation equality without unnatural parameter tuning. Compared with other EDE models, a distinguishing feature of ours is that it can also induce a new energy component during cosmic matter-dark energy transition. This is testable with low-redshift observations. |
| title | Early dark energy triggered by spacetime dynamics that encodes cosmic radiation-matter transition |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2402.03684 |