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math-ph2004★ 1 cited
Generating spectral gaps by geometry
Fernando Lledó, Olaf Post
Motivated by the analysis of Schrödinger operators with periodic potentials we consider the following abstract situation: Let be the Laplacian on a non-compact Riemannian cov…
math-ph2003★ 10 cited
Massless relativistic wave equations and quantum field theory
Fernando Lledó
We give a simple and direct construction of a massless quantum field with arbitrary discrete helicity that satisfies Wightman axioms and the corresponding relativistic wave equatio…