More About the Spontaneous Breaking of Time Reversal in de Sitter Space
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arXiv
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| _version_ | 1866915712421855232 |
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| author | Susskind, Leonard |
| author_facet | Susskind, Leonard |
| contents | It is widely thought that the quantum theory of de Sitter space requires the existence of a physical observer in the static patch. What exactly is meant by an observer is unclear; it could be anything from a few photons with energy just above the Gibbons-Hawking temperature to a gravitationally bound cluster of galaxies. In a recent note I explained that the need for observers can arise from the spontaneous breaking of time-reversal symmetry. This longer paper expands on the subject, filling in conceptual arguments that were implicit but not explicitly stated in the earlier paper. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_01666 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | More About the Spontaneous Breaking of Time Reversal in de Sitter Space Susskind, Leonard High Energy Physics - Theory It is widely thought that the quantum theory of de Sitter space requires the existence of a physical observer in the static patch. What exactly is meant by an observer is unclear; it could be anything from a few photons with energy just above the Gibbons-Hawking temperature to a gravitationally bound cluster of galaxies. In a recent note I explained that the need for observers can arise from the spontaneous breaking of time-reversal symmetry. This longer paper expands on the subject, filling in conceptual arguments that were implicit but not explicitly stated in the earlier paper. |
| title | More About the Spontaneous Breaking of Time Reversal in de Sitter Space |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2601.01666 |