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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.23007 |
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| _version_ | 1866910021767397376 |
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| author | Cao, Qing-Hong Tanaka, Masanori Wang, Jun-Chen Xie, Ke-Pan Zhang, Jing-Jun |
| author_facet | Cao, Qing-Hong Tanaka, Masanori Wang, Jun-Chen Xie, Ke-Pan Zhang, Jing-Jun |
| contents | We examine the idea that our universe began as a baby universe and show that this is feasible in a gauged $U(1)_{B-L}$ extension of the Standard Model with the classically conformal principle. For the first time, we define a measure to describe the probability that we reside in a baby universe, and find that it can be close to 1 in a considerable portion of the parameter space. The framework is consistent with current cosmological data, and it predicts the existence of a heavy neutral gauge boson, which could be detected at colliders, thereby offering a direct link between early-universe dynamics and experimentally testable signatures at the TeV scale. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_23007 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Can we live in a baby universe formed by a delayed first-order phase transition? Cao, Qing-Hong Tanaka, Masanori Wang, Jun-Chen Xie, Ke-Pan Zhang, Jing-Jun High Energy Physics - Phenomenology General Relativity and Quantum Cosmology We examine the idea that our universe began as a baby universe and show that this is feasible in a gauged $U(1)_{B-L}$ extension of the Standard Model with the classically conformal principle. For the first time, we define a measure to describe the probability that we reside in a baby universe, and find that it can be close to 1 in a considerable portion of the parameter space. The framework is consistent with current cosmological data, and it predicts the existence of a heavy neutral gauge boson, which could be detected at colliders, thereby offering a direct link between early-universe dynamics and experimentally testable signatures at the TeV scale. |
| title | Can we live in a baby universe formed by a delayed first-order phase transition? |
| topic | High Energy Physics - Phenomenology General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2505.23007 |