Finite-size corrections in theXYZHeisenberg chain

Abstract
We compute the large but finite-size corrections to the XYZ spin-(1/2) Heisenberg chain using a method recently proposed by de Vega and Woynarovich. We derive in closed form the corrections to the ground-state energy and the function σ(λ) (finite-size analog to the root density). Different asymptotic regimes are found when the number of sites goes to infinity depending on the two parameters of the Hamiltonian.