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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.08756 |
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| _version_ | 1866914259984711680 |
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| author | Irakleous, Anastasios |
| author_facet | Irakleous, Anastasios |
| contents | We present a unified Lorentzian replica-path-integral framework for computing entanglement entropy in fully time-dependent quantum field theories and gravitational systems. Building on this framework, we apply the real-time replica trick to cosmological spacetimes without spatial boundaries and relate it to existing proposals that identify effective dual QFT descriptions on screen-like surfaces inside the spacetime. We also extend the Lorentzian replica construction to intrinsic gravitational subsystems, focusing on Hawking radiation and including quantum corrections in purely gravitational settings lacking time-reflection symmetry. In both contexts, island-type replica saddles arise naturally. A brief review of the QFT and holographic cases is included to establish the common structure underlying these applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_08756 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Replica Trick in Time-Dependent Geometries Irakleous, Anastasios High Energy Physics - Theory We present a unified Lorentzian replica-path-integral framework for computing entanglement entropy in fully time-dependent quantum field theories and gravitational systems. Building on this framework, we apply the real-time replica trick to cosmological spacetimes without spatial boundaries and relate it to existing proposals that identify effective dual QFT descriptions on screen-like surfaces inside the spacetime. We also extend the Lorentzian replica construction to intrinsic gravitational subsystems, focusing on Hawking radiation and including quantum corrections in purely gravitational settings lacking time-reflection symmetry. In both contexts, island-type replica saddles arise naturally. A brief review of the QFT and holographic cases is included to establish the common structure underlying these applications. |
| title | Replica Trick in Time-Dependent Geometries |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2601.08756 |