Adjointness Relations as a Criterion for Choosing an Inner Product
Alan D. Rendall
Abstract
This is a contribution to the forthcoming book "Canonical Gravity: From Classical to Quantum" edited by J. Ehlers and H. Friedrich. Ashtekar's criterion for choosing an inner product in the quantisation of constrained systems is discussed. An erroneous claim in a previous paper is corrected and a cautionary example is presented.
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