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math-ph2025
Exactly solvable inhomogeneous XY spin chain
Pierre-Antoine Bernard, Nicolas Crampé, Quentin Labriet +2
Analytical expressions for the eigenvalues of certain inhomogeneous XY spin chains are computed. These models are rewritten in terms of free-fermion models using a well-known Jorda…
math-ph2019
Veronese subsequent analytic solutions of the sigma model equations described via Krawtchouk polynomials
Nicolas Crampé, Alfred Michel Grundland
The objective of this paper is to establish a new relationship between the Veronese subsequent analytic solutions of the Euclidean sigma model in two dimensions…