3 papers
cond-mat.str-el2026
Quantum-classical crossover in finite spin-1/2 rings with Dzyaloshinsky-Moriya interaction
Raúl Sánchez Galán, Robert Wieser
We study finite spin- rings with nearest-neighbor Heisenberg exchange, Dzyaloshinsky--Moriya interaction, and an external magnetic field. We introduce an interpolation pa…
math.PR2026
Secretary Problem Thresholds and Convergents of
Raúl Sánchez Galán
We prove that if is a continued fraction convergent of with , then, for the secretary problem with applicants, the optimal number of initially rejected app…
hep-th2026
Vortex Harmonic Spinors on the Nappi-Witten Space
Calum Ross, Raúl Sánchez Galán
We establish a correspondence between vortex equations on flat Riemann surfaces and harmonic spinors on the Nappi--Witten space, the group manifold of a central extension of the Eu…