Entanglement and quench dynamics in the thermally perturbed tricritical fixed point

Király, Csilla and Lencsés, Máté (2026) Entanglement and quench dynamics in the thermally perturbed tricritical fixed point. SciPost Physics, 20 (2). No. 030. ISSN 2542-4653

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Abstract

We consider the Blume–Capel model in the scaling limit to realize the thermal perturbation of the tricritical Ising fixed point. We develop a numerical scaling limit extrapolation for one-point functions and Rényi entropies in the ground state. In a mass quench scenario, we found long-lived oscillations despite the absence of explicit spin-flip symmetry breaking or confining potential. We construct form factors of branch-point twist fields in the paramagnetic phase. In the scaling limit of small quenches, we verify form factor predictions for the energy density and leading magnetic field using the dynamics of onepoint functions, and branch-point twist fields using the dynamics of Rényi entropies.

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