# Strongly anomalous non-thermal fixed point in a quenched two-dimensional Bose gas

Source: [Strongly anomalous non-thermal fixed point in a quenched two-dimensional Bose gas](<https://www.sota2.com/research/paper/68fa37501e209131ce8b131c>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-27T03:50:39.472Z

Authors: Markus Karl, Thomas Gasenzer

Published: 2016-11-03T20:00:04.000Z

## Abstract

Universal scaling behavior in the relaxation dynamics of an isolated two-dimensional Bose gas is studied by means of semi-classical stochastic simulations of the Gross-Pitaevskii model. The system is quenched far out of equilibrium by imprinting vortex defects into an otherwise phase-coherent condensate. A strongly anomalous non-thermal fixed point is identified, associated with a slowed decay of the defects in the case that the dissipative coupling to the thermal background noise is suppressed. At this fixed point, a large anomalous exponent $\\eta \\simeq -3$ and, related to this, a large dynamical exponent $z \\simeq 5$ are identified. The corresponding power-law decay is found to be consistent with three-vortex-collision induced loss. The article discusses these aspects of non-thermal fixed points in the context of phase-ordering kinetics and coarsening dynamics, thus relating phenomenological and analytical approaches to classifying far-from-equilibrium scaling dynamics with each other. In particular, a close connection between the anomalous scaling exponent $\\eta$, introduced in a quantum-field theoretic approach, and conservation-law induced scaling in classical phase-ordering kinetics is revealed. Moreover, the relation to superfluid turbulence as well as to driven stationary systems is discussed.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1611.01163>)

[PDF](<https://arxiv.org/pdf/1611.01163.pdf>)