Alexandre Belin 副教授学术报告

Title: Euclidean Wormholes and Gravitational States

Speaker: Alexandre Belin

Affiliation: University of Milano-Bicocca, Italy（意大利米兰比可卡大学）

Time: 16:00-17:00, Friday, November 14th, 2025 (UTC+8, Beijing Time)

Venue: Zoom Meeting (ID: 385 442 0225; Passcode: yauc)

Inviter: Hai Lin (林海)

Abstract

Euclidean wormholes are known to encode important non-perturbative effects in the physics of quantum black holes. In this talk, I will explain the slicing of Euclidean wormholes along a time-reflection symmetric slice which treats half of the Euclidean geometry as a gravitational machinery to produce a semi-classical state. This type of state preparation is different from Hartle-Hawking states prepared with the CFT path integral, such as the thermofield-double state. Nevertheless, the two different types of states have order one overlaps provided the gravitational data agrees on the initial data slice. This raises an interesting puzzle: one can easily construct an infinite family of semi-classical states that have order one overlap with the thermofield double state, while having a very different Euclidean preparation. We provide a microscopic description of wormhole states in the dual CFT and reformulate the factorization puzzle in the language of entanglement and the Hilbert space.

Speaker

Alexandre Belin received his Ph.D. from McGill University, Canada, in 2015. He is associate professor at University of Milano-Bicocca, Milan, Italy. He works in foundational fields of Theoretical physics and Mathematical methods of Fundamental Interactions. He is a world expert in string theory, quantum field theory, quantum information and mathematical physics.

The seminar will be broadcasted online by Zoom.

Interested people are free to join, without registration in advance.

The Zoom info is

URL: https://us02web.zoom.us/j/3854420225?pwd=SXY4eWJKOTBFZWJDaE16aXpTamY1QT09

Meeting ID: 385 442 0225

Passcode: yauc