From Explicit Diffeomorphism Breaking to Spontaneous Unimodularization
Fuente:
arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908407919804416 |
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| author | Bonder, Yuri Morales, Johas D. |
| author_facet | Bonder, Yuri Morales, Johas D. |
| contents | This contribution investigates modifications of General Relativity that allow or mimic energy nonconservation. We focus on Unimodular Gravity (UG), a theory that explicitly breaks diffeomorphism invariance, and show that it can lead to particle acceleration, opening the door to experimental constraints. We also argue that UG admits a well-posed initial value formulation, despite the presence of nondynamical structures. Finally, we introduce a simple model that spontaneously mimics UG, but in which a cosmological constant cannot arise as an integration constant. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_12499 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | From Explicit Diffeomorphism Breaking to Spontaneous Unimodularization Bonder, Yuri Morales, Johas D. General Relativity and Quantum Cosmology High Energy Physics - Phenomenology This contribution investigates modifications of General Relativity that allow or mimic energy nonconservation. We focus on Unimodular Gravity (UG), a theory that explicitly breaks diffeomorphism invariance, and show that it can lead to particle acceleration, opening the door to experimental constraints. We also argue that UG admits a well-posed initial value formulation, despite the presence of nondynamical structures. Finally, we introduce a simple model that spontaneously mimics UG, but in which a cosmological constant cannot arise as an integration constant. |
| title | From Explicit Diffeomorphism Breaking to Spontaneous Unimodularization |
| topic | General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2506.12499 |