Naiara Arrizabalaga

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Spectral properties and the confinement phenomenon for the couplingH+V are studied, where H = −iα ·∇+mβ is the free Dirac operator in R and V is a measure-valued potential. The potentials V under consideration are given in terms of surface measures on the boundary of bounded regular domains in R. A criterion for the existence of point spectrum is given,(More)
In this article we investigate spectral properties of the coupling H +Vλ, where H = −iα · ∇ +mβ is the free Dirac operator in R, m > 0 and Vλ is an electrostatic shell potential (which depends on a parameter λ ∈ R) located on the boundary of a smooth domain in R. Our main result is an isoperimetric-type inequality for the admissible range of λ’s for which(More)
BACKGROUND The aims of the present paper are: to reduce waiting time for treatment of patients with low back pain/cervical pain; to determine the degree of satisfaction of patients being treated by groups; and to determine whether there is correlation amongst satisfaction, improvement of pain and impact on the activities of everyday life. METHODS(More)
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