Entanglement and quench dynamics in the thermally perturbed tricritical fixed point

by Csilla Király (BME Department of Theoretical Physics & HUN-REN Wigner RCP)

Friday 20 Mar 2026, 14:00 → 15:00 Europe/Budapest

The Blume–Capel model, a spin chain exhibiting a tricritical point described by a conformal field theory with central charge c=7/10, provides a natural setting for studying its thermal perturbation, the integrable E_7 quantum field theory. In this talk, I present numerical and analytical investigations of the E_7 model. Numerically, I use the infinite Time Evolving Block Decimation (iTEBD) algorithm to study post-quench dynamics of the Blume–Capel model near the tricritical point. Analytically, I discuss results from the form factor bootstrap program, including the computation of twist-field form factors, validated using the \Delta-theorem. Finally, I present results on expectation values and entanglement entropies following E_7 mass quenches, which show strong agreement with theoretical predictions.