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Connection formulae for spectral functions associated with singular Dirac equations

Published online by Cambridge University Press:  12 July 2007

S. M. Riehl
Affiliation:
University of Northern Iowa, Cedar Falls, IA 50614-0506, USA
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Abstract

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We consider the Dirac equation given by with initial condition y1 (0) cos α + y2(0) sin α = 0, α ε [0; π ) and suppose the equation is in the limit-point case at infinity. Using to denote the derivative of the corresponding spectral function, a formula for is given when is known and positive for three distinct values of α. In general, if is known and positive for only two distinct values of α, then is shown to be one of two possibilities. However, in special cases of the Dirac equation, can be uniquely determined given for only two values of α.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 2004