# Quantum quenches in isolated quantum glasses out of equilibrium

## TL;DR

This paper investigates how a quantum glass system thermalizes after a quench, revealing that stronger interactions or quantum fluctuations can stabilize glassy states and lower the effective temperature.

## Contribution

It introduces a novel analysis of quantum quenches in the spherical p-spin model using Schwinger-Keldysh formalism, highlighting the effects of interactions and quantum fluctuations.

## Key findings

- Increasing interaction strength lowers effective temperature.
- Quantum fluctuations stabilize glassy states.
- System can equilibrate after a quench with modified properties.

## Abstract

In this work, we address the question of how a closed quantum system thermalises in the presence of a random external potential. By investigating the quench dynamics of the isolated quantum spherical $p$-spin model, a paradigmatic model of a mean-field glass, we aim to shed new light on this complex problem. Employing a closed-time Schwinger-Keldysh path integral formalism, we first initialise the system in a random, infinite-temperature configuration and allow it to equilibrate in contact with a thermal bath before switching off the bath and performing a quench. We find evidence that increasing the strength of either the interactions or the quantum fluctuations can act to lower the effective temperature of the isolated system and stabilise glassy behaviour.