On (dis)agreement between different methods of calculation of the imaginary part of the effective action in expanding space-times
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866917155283402752 |
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| author | Akhmedov, E. T. Belkovich, I. A. Diakonov, D. V. Kazarnovskii, K. A. |
| author_facet | Akhmedov, E. T. Belkovich, I. A. Diakonov, D. V. Kazarnovskii, K. A. |
| contents | We consider two approaches to calculate imaginary parts of effective actions in expanding space-times. While the first approach uses Bogolyubov coefficients, the second one uses the functional integral or the Feynman propagator. In eternally expanding space-times these two approaches give different answers for the imaginary parts. The origin of the difference can be traced to the presence if the wave-functionals for the initial and final states in the functional integral. We show this explicitly on the example of the expanding Poincare patch of the de Sitter space-time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_02170 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On (dis)agreement between different methods of calculation of the imaginary part of the effective action in expanding space-times Akhmedov, E. T. Belkovich, I. A. Diakonov, D. V. Kazarnovskii, K. A. High Energy Physics - Theory We consider two approaches to calculate imaginary parts of effective actions in expanding space-times. While the first approach uses Bogolyubov coefficients, the second one uses the functional integral or the Feynman propagator. In eternally expanding space-times these two approaches give different answers for the imaginary parts. The origin of the difference can be traced to the presence if the wave-functionals for the initial and final states in the functional integral. We show this explicitly on the example of the expanding Poincare patch of the de Sitter space-time. |
| title | On (dis)agreement between different methods of calculation of the imaginary part of the effective action in expanding space-times |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2411.02170 |