Backreaction, Quantum Chaos, and Emergent Geometry in SYK–JT Gravity Systems

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• Chente Ma (Great Bay University)
• Friday 19 September 2025, 10:00-11:30
• Seminar Room 2, Newton Institute.

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BID - Quantum field theory with boundaries, impurities, and defects

We study matter backreaction, quantum chaos, and emergent geometry in JT gravity coupled to Dirac fermions via deformed SYK models. By introducing bulk fermion mass and non-Gaussian disorder, we uncover how these deformations affect entanglement dynamics and the spectral form factor’s timescales, while preserving the system’s random matrix classification. In the large‑N limit, we identify a transition in von Neumann algebra structure from Type I to Type II, indicating maximally entangled graviton–matter states. These findings shed light on semi-classical holography and the algebraic origins of emergent spacetime.

This talk is part of the Isaac Newton Institute Seminar Series series.

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