On the causal discontinuity of Morse spacetimes
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909657642041344 |
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| author | Dahinden, Lucas Jin, Liang |
| author_facet | Dahinden, Lucas Jin, Liang |
| contents | Morse spacetime is a model of singular Lorentzian manifold, built upon a Morse function which serves as a global time function outside its critical points. The Borde-Sorkin conjecture states that a Morse spacetime is causally continuous if and only if the index and coindex of critical points of the corresponding Morse function are both different from 1. The conjecture has recently been confirmed by Garcia Heveling for the case of small anisotropy and Euclidean background metric. Here, we provide a complementary counterexample: a four dimensional Morse spacetime whose critical point has index 2 and large enough anisotropy is causally discontinuous and thus the Borde-Sorkin conjecture does not hold. The proof features a low regularity causal structure and causal bubbling. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_16571 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On the causal discontinuity of Morse spacetimes Dahinden, Lucas Jin, Liang Differential Geometry Primary 53C50, Secondary 83C75, 53Z05 Morse spacetime is a model of singular Lorentzian manifold, built upon a Morse function which serves as a global time function outside its critical points. The Borde-Sorkin conjecture states that a Morse spacetime is causally continuous if and only if the index and coindex of critical points of the corresponding Morse function are both different from 1. The conjecture has recently been confirmed by Garcia Heveling for the case of small anisotropy and Euclidean background metric. Here, we provide a complementary counterexample: a four dimensional Morse spacetime whose critical point has index 2 and large enough anisotropy is causally discontinuous and thus the Borde-Sorkin conjecture does not hold. The proof features a low regularity causal structure and causal bubbling. |
| title | On the causal discontinuity of Morse spacetimes |
| topic | Differential Geometry Primary 53C50, Secondary 83C75, 53Z05 |
| url | https://arxiv.org/abs/2402.16571 |