The Eigenfunction Expansion Method
Finding the heat kernel of an elliptic operator on a compact manifold using the eigenvalues method is a well-known method in mathematical physics and quantum mechanics. Roughly speaking, the eigenvalues and eigenfunctions of an operator determine its heat kernel. The formula is an infinite series that involves products of eigenfunctions; see Theorem 6.1.1. It is interesting that in several cases this series can be written as an elementary function by using the associated bilinear generating function.
KeywordsHeat Kernel Gravitational Potential Hermite Polynomial Eigenfunction Expansion Complete Orthonormal System
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