Seminar detail: Black Hole Interior and Quantum Error Correction with Dynamical Gravity

Date&Time	Tue Apr 07 2026 (17:00 - 18:00)
Speaker	Akihiro Miyata
Affiliation	YITP, Kyoto U
Title	Black Hole Interior and Quantum Error Correction with Dynamical Gravity
Abstract	According to the island formula, information in the code subspace defined in the black hole interior is embedded in the Hawking radiation after the Page time. At first sight, this embedding suggests that operations acting on the Hawking radiation could modify the information in the code subspace, potentially leading to an apparent violation of causality. Indeed, in previous studies based on the PSSY model, which incorporates only the topological degrees of freedom of gravity, it was shown that when the error is sufficiently large, a violation of causality can arise, as indicated by a nonvanishing mutual information. In our work, we investigate the situation in which dynamical gravity also acts on the Hawking radiation. In this case, operations on the Hawking radiation induce nontrivial backreaction on the bulk spacetime appearing in the gravitational path integral for the mutual information — an effect that is absent when the Hawking radiation is non-gravitating. We find that this backreaction renders the relevant mutual information vanishing. This result implies that, in theories with dynamical gravity, the apparent violation of causality is resolved. In this talk, I will explain this result. This talk is based on joint work with Tomonori Ugajin (arXiv:2602.01241 [hep-th]).
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