Low Energy States and CPT invariance at the Big Bang
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866910575919890432 |
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| author | Nadal-Gisbert, Sergi Navarro-Salas, José Pla, Silvia |
| author_facet | Nadal-Gisbert, Sergi Navarro-Salas, José Pla, Silvia |
| contents | In this paper, we analyze the quantum vacuum in a radiation-dominated and CPT-invariant universe by further imposing the quantum states to be ultraviolet regular i.e., satisfying the Hadamard/adiabatic condition. For scalar fields, this is enforced by constructing the vacuum via the States of Low Energy proposal. For spin-$\frac{1}{2}$ fields, we extend this proposal for a FLRW spacetime and apply it for the radiation-dominated and CPT-invariant universe. We focus on minimizing the smeared energy density around the Big Bang and give strong evidence that the resulting states satisfy the Hadamard/adiabatic condition. These states are then self-consistent candidates as effective Big Bang quantum vacuum from the field theory perspective. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2302_08812 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Low Energy States and CPT invariance at the Big Bang Nadal-Gisbert, Sergi Navarro-Salas, José Pla, Silvia General Relativity and Quantum Cosmology High Energy Physics - Theory In this paper, we analyze the quantum vacuum in a radiation-dominated and CPT-invariant universe by further imposing the quantum states to be ultraviolet regular i.e., satisfying the Hadamard/adiabatic condition. For scalar fields, this is enforced by constructing the vacuum via the States of Low Energy proposal. For spin-$\frac{1}{2}$ fields, we extend this proposal for a FLRW spacetime and apply it for the radiation-dominated and CPT-invariant universe. We focus on minimizing the smeared energy density around the Big Bang and give strong evidence that the resulting states satisfy the Hadamard/adiabatic condition. These states are then self-consistent candidates as effective Big Bang quantum vacuum from the field theory perspective. |
| title | Low Energy States and CPT invariance at the Big Bang |
| topic | General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2302.08812 |