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Phys Rev E Stat Nonlin Soft Matter Phys ; 65(5 Pt 2): 056112, 2002 May.
Article in English | MEDLINE | ID: mdl-12059652

ABSTRACT

We present a simple method to deal with caustics in the semiclassical approximation to the thermal density matrix of a particle moving on the line. For simplicity, only its diagonal elements are considered. The only ingredient we require is the knowledge of the extrema of the Euclidean action. The procedure makes use of complex trajectories, and is applied to the quartic double-well potential.

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