Massless graviton in de Sitter as second sound in two-fluid hydrodynamics
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arXiv
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| _version_ | 1866913105581178880 |
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| author | Volovik, G. E. |
| author_facet | Volovik, G. E. |
| contents | The concept of gravitons and their masses, clear in the case of Minkowski spacetime, remains ambiguous for de Sitter spacetime. Here, we used a two-fluid approach to de Sitter thermodynamics and found a collective mode that is analogous to second sound in the two-fluid dynamics of the de Sitter state. This mode is massless and propagates at the speed of light. This suggests that this second-sound analog is a massless graviton propagating in de Sitter spacetime. The type of graviton this mode represents requires further consideration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00639 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Massless graviton in de Sitter as second sound in two-fluid hydrodynamics Volovik, G. E. General Relativity and Quantum Cosmology Other Condensed Matter The concept of gravitons and their masses, clear in the case of Minkowski spacetime, remains ambiguous for de Sitter spacetime. Here, we used a two-fluid approach to de Sitter thermodynamics and found a collective mode that is analogous to second sound in the two-fluid dynamics of the de Sitter state. This mode is massless and propagates at the speed of light. This suggests that this second-sound analog is a massless graviton propagating in de Sitter spacetime. The type of graviton this mode represents requires further consideration. |
| title | Massless graviton in de Sitter as second sound in two-fluid hydrodynamics |
| topic | General Relativity and Quantum Cosmology Other Condensed Matter |
| url | https://arxiv.org/abs/2601.00639 |