### Past Events

### [Quast Seminar] Dario Cafasso

2024-05-30Title: Quantum Time-Dilation in Qubit Hypersurfaces

Abstract: The use of quantum spin systems to study the phenomenon of quantum time dilation leads to new insights into the quantum description of gravity. The basis of this description is the Page and Wootters mechanism, where entanglement between two quantum systems allows one to act as a clock for the other, influencing its time evolution. Intriguingly, when the clock system experiences a "gravitational-like interaction", the resulting time evolution can be described by a Time-Dilated Schrödinger equation. This equation includes a "redshift operator," a purely quantum effect that mimics gravitational time dilation. Here we discuss a novel, finite-dimensional framework in which a network of qubit systems can be used as a "global" clock for another non-interacting component of the universe. The result is the Time-Dilation induced Interaction Transfer (TiDIT) mechanism. TiDIT describes how time dilation due to the interaction of a qubit effectively changes the interaction between previously non-interacting parts of the universe. We will explore this concept with a practical example using two coupled qubits as a model for the quantum clock.

### [QUAST Seminar] Mykhaylo Usatyuk: Closed universes in two dimensional gravity

2024-05-14Dr Mykhaylo Usatyuk

Kavli Institute for Theoretical Physics, Santa Barbara

### [QUAST Seminar] Ronak Soni: Extremality as a Consistency Condition on Subregion Duality

2024-05-07Ronak Soni

University of Cambridge, DAMTP

### [QUAST Seminar] Ana-Maria Raclariu: Entanglement, soft modes and celestial holography

2024-04-25Ana-Maria Raclariu

King's College London

### [QUAST Seminar] Aaron Poole: Thermodynamics of accelerating AdS_4 black holes from the covariant phase space

2024-03-18Thermodynamics of accelerating AdS_4 black holes from the covariant phase space

Aaron Poole

Kyung Hee University, South Korea

### [QUAST Seminar] Bilyana Tomova - Asymptotic symmetries of gravity

2023-11-20# Asymptotic symmetries of gravity,

Bilyana Tomova,

OIST

### [QUAST Seminar]: Elliott Gesteau - Large N von Neumann algebras and the renormalization of Newton's constant

2023-11-15Large N von Neumann algebras and the renormalization of Newton's constant

Elliott Gesteau

Caltech

### QUAST seminar: Francesco Sartini

2023-10-30**Francesco Sartini (OIST): Hidden symmetry in cosmology and black holes**

### QUAST Seminar: Patricia Ribes Metidieri

2023-06-29Patricia Ribes Metidieri, Radboud University: How ubiquitous is entanglement in quantum field theory?

### [Seminar] Kavan Modi (Monash), Quantum Chaos = Volume-Law Spatiotemporal Entanglement

2023-03-20Seminar by Kavan Modi (Monash), Mon Mar 20 2pm JST