# Quench dynamics of the Ising field theory in a magnetic field

### Submission summary

 As Contributors: Márton Kormos Arxiv Link: https://arxiv.org/abs/1803.01158v4 Date accepted: 2018-09-19 Date submitted: 2018-08-04 Submitted by: Kormos, Márton Submitted to: SciPost Physics Discipline: Physics Subject area: Quantum Physics Approach: Theoretical

### Abstract

We numerically simulate the time evolution of the Ising field theory after quenches starting from the $E_8$ integrable model using the Truncated Conformal Space Approach. The results are compared with two different analytic predictions based on form factor expansions in the pre-quench and post-quench basis, respectively. Our results clarify the domain of validity of these expansions and suggest directions for further improvement. We show for quenches in the $E_8$ model that the initial state is not of the integrable pair state form. We also construct quench overlap functions and show that their high-energy asymptotics are markedly different from those constructed before in the sinh/sine-Gordon theory, and argue that this is related to properties of the ultraviolet fixed point.

### Ontology / Topics

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Published as SciPost Phys. 5, 027 (2018)

### Author comments upon resubmission

Dear Editor,

We resubmit our manuscript after addressing all questions, comments and requests of the Referees. We found the reports very constructive and useful.

As both Referees suggested the publication of our manuscript, we hope that revised version can appear in SciPost Physics.

Yours sincerely,
The authors

### List of changes

In our point-by-point replies to the reports we indicate all the changes.

### Submission & Refereeing History

Resubmission 1803.01158v4 on 4 August 2018
Submission 1803.01158v3 on 3 April 2018