Formation of shell-crossing singularities in effective gravitational collapse models with bounded and unbounded polymerizations
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866913034809638912 |
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| author | Fazzini, Francesco Giesel, Kristina Rullit, Eric |
| author_facet | Fazzini, Francesco Giesel, Kristina Rullit, Eric |
| contents | We extend the investigation into the formation of shell-crossing singularites (SCS) in effective polymerized LTB models to the LQG-inspired asymmetric bounce model, as well as to effective LTB models based on the solutions of Bardeen and Hayward, in which no bounce occurs. While the asymmetric bouncing model belongs to the class of bounded polymerization functions, the latter models feature unbounded polymerization functions.
Our results show that, similar to the symmetric bouncing model, for the asymmetric bouncing model SCS are unavoidable for inhomogeneous dust profiles. In contrast, for models without a bounce and with unbounded polymerization functions, no SCS form for inhomogeneous, decreasing dust profiles -- a situation that resembles classical theory, in which SCS can also be avoided by a suitable choice of initial data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_13716 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Formation of shell-crossing singularities in effective gravitational collapse models with bounded and unbounded polymerizations Fazzini, Francesco Giesel, Kristina Rullit, Eric General Relativity and Quantum Cosmology We extend the investigation into the formation of shell-crossing singularites (SCS) in effective polymerized LTB models to the LQG-inspired asymmetric bounce model, as well as to effective LTB models based on the solutions of Bardeen and Hayward, in which no bounce occurs. While the asymmetric bouncing model belongs to the class of bounded polymerization functions, the latter models feature unbounded polymerization functions. Our results show that, similar to the symmetric bouncing model, for the asymmetric bouncing model SCS are unavoidable for inhomogeneous dust profiles. In contrast, for models without a bounce and with unbounded polymerization functions, no SCS form for inhomogeneous, decreasing dust profiles -- a situation that resembles classical theory, in which SCS can also be avoided by a suitable choice of initial data. |
| title | Formation of shell-crossing singularities in effective gravitational collapse models with bounded and unbounded polymerizations |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2604.13716 |