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cond-mat.stat-mech2026
Entanglement asymmetry in the gapped XYZ spin- chain
Felipe Taha Sant'Ana
The entanglement asymmetry measures how strongly a symmetry is broken inside a subsystem. Analytic results at equilibrium have so far covered free theories and, perturbatively, the…
cond-mat.quant-gas2026
Canonical-ensemble scaling of Tan's contact in the trapped Tonks--Girardeau gas
Felipe Taha Sant'Ana
We derive the canonical-ensemble scaling of Tan's contact for harmonically trapped Tonks--Girardeau bosons at finite temperature in the large- limit. The leading scaling coe…
math-ph2026
Weak-Coupling Limit of the Lattice Nonlinear Schrödinger Integral Equation
Felipe Taha Sant'Ana
We study the ground-state integral equation of the quantum lattice nonlinear Schrödinger model, equivalently the isotropic Heisenberg XXX chain at spin , whose solution is…