Entropy bound and the non-universality of entanglement islands
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arXiv
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866917438559354880 |
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| author | Kumar, Naman |
| author_facet | Kumar, Naman |
| contents | Entanglement islands resolve the AMPS firewall paradox in a region-dependent manner by modifying the entanglement wedge of Hawking radiation. We investigate whether this resolution can be made universal, in the sense that a single compact island serves as a common interior support for all AMPS-relevant radiation regions. We show that such a construction is obstructed under reasonable assumptions. Universality forces an accumulation of interior partner entropy within a fixed compact region, which at late times exceeds the Bekenstein--Hawking bound set by its boundary area. However, a bona fide semiclassical island realization for at least one radiation region is expected to be compatible with semiclassical entropy bounds. This leads to a contradiction, yielding a conditional no-go result for universal compact islands. Our result implies that interior reconstruction in the island framework must remain intrinsically region-dependent. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_20165 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Entropy bound and the non-universality of entanglement islands Kumar, Naman High Energy Physics - Theory General Relativity and Quantum Cosmology Entanglement islands resolve the AMPS firewall paradox in a region-dependent manner by modifying the entanglement wedge of Hawking radiation. We investigate whether this resolution can be made universal, in the sense that a single compact island serves as a common interior support for all AMPS-relevant radiation regions. We show that such a construction is obstructed under reasonable assumptions. Universality forces an accumulation of interior partner entropy within a fixed compact region, which at late times exceeds the Bekenstein--Hawking bound set by its boundary area. However, a bona fide semiclassical island realization for at least one radiation region is expected to be compatible with semiclassical entropy bounds. This leads to a contradiction, yielding a conditional no-go result for universal compact islands. Our result implies that interior reconstruction in the island framework must remain intrinsically region-dependent. |
| title | Entropy bound and the non-universality of entanglement islands |
| topic | High Energy Physics - Theory General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2604.20165 |