Particle creation from non-geodesic trajectories in multifield inflation
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916651176296448 |
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| author | Parra, Nicolás Sypsas, Spyros Palma, Gonzalo A. Zenteno, Cristóbal |
| author_facet | Parra, Nicolás Sypsas, Spyros Palma, Gonzalo A. Zenteno, Cristóbal |
| contents | Particle production in de Sitter spacetime arises from the exponential expansion of space, rendering the Bunch-Davies vacuum perceived as a particle-containing state by late-time observers. For states defined as eigenstates of both momentum and the Hamiltonian, the Bunch-Davies vacuum exhibits a constant particle density per physical momentum. We explore particle production beyond this baseline, focusing on deviations from exact de Sitter conditions and non-gravitational interactions, such as slow-roll inflation or interactions arising from the coupling of inflation to other fields. Using Bogoliubov transformations, we calculate the number density of energy/momentum eigenstates. In single-field inflation, this density captures the observed spectral index of the primordial power spectrum, while in two-field models, it reflects the non-gravitational coupling driving background trajectory turning. We present analytical results applicable to various scenarios involving particle production from non-adiabatic processes during inflation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_13843 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Particle creation from non-geodesic trajectories in multifield inflation Parra, Nicolás Sypsas, Spyros Palma, Gonzalo A. Zenteno, Cristóbal High Energy Physics - Theory Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology Particle production in de Sitter spacetime arises from the exponential expansion of space, rendering the Bunch-Davies vacuum perceived as a particle-containing state by late-time observers. For states defined as eigenstates of both momentum and the Hamiltonian, the Bunch-Davies vacuum exhibits a constant particle density per physical momentum. We explore particle production beyond this baseline, focusing on deviations from exact de Sitter conditions and non-gravitational interactions, such as slow-roll inflation or interactions arising from the coupling of inflation to other fields. Using Bogoliubov transformations, we calculate the number density of energy/momentum eigenstates. In single-field inflation, this density captures the observed spectral index of the primordial power spectrum, while in two-field models, it reflects the non-gravitational coupling driving background trajectory turning. We present analytical results applicable to various scenarios involving particle production from non-adiabatic processes during inflation. |
| title | Particle creation from non-geodesic trajectories in multifield inflation |
| topic | High Energy Physics - Theory Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2410.13843 |