Bounds on Gravitational Wave Production from Unitarity in an Early NEC-Violating Model
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| _version_ | 1866908776419819520 |
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| author | Petrov, Pavel Wang, Jianing |
| author_facet | Petrov, Pavel Wang, Jianing |
| contents | We study a cosmological scenario featuring an early phase of null energy condition (NEC) violation. Within this framework, we show that perturbative unitarity bounds place strong constraints on both the amplitude and the spectral tilt of primordial gravitational waves. Our analysis is largely insensitive to the detailed realization of the transition between the NEC-violating phase and subsequent cosmological phases, allowing our results to be extended to a broader class of models. Finally, the perturbative unitarity approach employed here is applicable to a wide range of cosmological scenarios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_14008 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Bounds on Gravitational Wave Production from Unitarity in an Early NEC-Violating Model Petrov, Pavel Wang, Jianing High Energy Physics - Theory General Relativity and Quantum Cosmology We study a cosmological scenario featuring an early phase of null energy condition (NEC) violation. Within this framework, we show that perturbative unitarity bounds place strong constraints on both the amplitude and the spectral tilt of primordial gravitational waves. Our analysis is largely insensitive to the detailed realization of the transition between the NEC-violating phase and subsequent cosmological phases, allowing our results to be extended to a broader class of models. Finally, the perturbative unitarity approach employed here is applicable to a wide range of cosmological scenarios. |
| title | Bounds on Gravitational Wave Production from Unitarity in an Early NEC-Violating Model |
| topic | High Energy Physics - Theory General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2601.14008 |