Supersymmetry and Brownian motion on supermanifolds

Details Supersymmetry and Brownian motion on supermanifolds Supersymmetry and Brownian motion on supermanifolds

2002-01-03

arxiv.org/abs/quant-ph/0201006v1

Physics

Quantum Physics

49 pages

Scientific paper

An anticommuting analogue of Brownian motion, corresponding to fermionic quantum mechanics, is developed, and combined with classical Brownian motion to give a generalised Feynman-Kac-It\^o formula for paths in geometric supermanifolds. This formula is applied to give a rigorous version of the proofs of the Atiyah-Singer index theorem based on supersymmetric quantum mechanics. It is also shown how superpaths, parametrised by a commuting and an anticommuting time variable, lead to a manifestly supersymmetric approach to the index of the Dirac operator. After a discussion of the BFV approach to the quantization of theories with symmetry, it is shown how the quantization of the topological particle leads to the supersymmetric model introduced by Witten in his study of Morse theory.

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