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arXiv · 1803.01158

Quench dynamics of the Ising field theory in a magnetic field

Kristóf Hódsági·Márton Kormos·Gábor Takács
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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.

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Kristóf Hódsági, Márton Kormos, Gábor Takács. 2018-03-03. Quench dynamics of the Ising field theory in a magnetic field. https://doi.org/10.21468/scipostphys.5.3.027

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