Wrapping Brownian motion and heat kernels I: compact Lie groups

Details Wrapping Brownian motion and heat kernels I: compact Lie groups Wrapping Brownian motion and heat kernels I: compact Lie groups

2010-05-26

arxiv.org/abs/1005.4746v1

Mathematics

Representation Theory

21 pages

Scientific paper

An important object of study in harmonic analysis is the heat equation. On a Euclidean space, the fundamental solution of the associated semigroup is known as the heat kernel, which is also the law of Brownian motion. Similar statements also hold in the case of a Lie group. By using the wrapping map of Dooley and Wildberger, we show how to wrap a Brownian motion to a compact Lie group from its Lie algebra (viewed as a Euclidean space) and find the heat kernel. This is achieved by considering It\^o type stochastic differential equations and applying the Feynman-Ka\v{c} theorem.

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