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van Vleck determinants: geodesic focussing and defocussing in Lorentzian spacetimes

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arxiv hep-th/9303020 v1 pith:N4BCK4MV submitted 1993-03-03 hep-th gr-qc

classification hep-thgr-qc
keywords approximationsgeodesicvleckdefocussingdeterminantdevelopmentsflowsfocussing
verification ladder T0 review T1 audit T2 compute T3 formal

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The van Vleck determinant is an ubiquitous object, arising in many physically interesting situations such as: (1) WKB approximations to quantum time evolution operators and Green functions. (2) Adiabatic approximations to heat kernels. (3) One loop approximations to functional integrals. (4) The theory of caustics in geometrical optics and ultrasonics. (5) The focussing and defocussing of geodesic flows in Riemannian manifolds. While all of these topics are interrelated, the present paper is particularly concerned with the last case and presents extensive theoretical developments that aid in the computation of the van Vleck determinant associated with geodesic flows in Lorentzian spacetimes. {\sl A fortiori} these developments have important implications for the entire array of topics indicated. PACS: 04.20.-q, 04.20.Cv, 04.60.+n. To appear in Physical Review D47 (1993) 15 March.

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