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Keywords:
Witten deformation; local index density; de Rham complex; Dolbeault complex; equivariant index density
Witten deformation; local index density; de Rham complex; Dolbeault complex; equivariant index density
Summary:
A perturbation of the de Rham complex was introduced by Witten for an exact 1-form $\Theta $ and later extended by Novikov for a closed 1-form on a Riemannian manifold $M$. We use invariance theory to show that the perturbed index density is independent of $\Theta $; this result was established previously by J. A. Álvarez López, Y. A. Kordyukov and E. Leichtnam (2020) using other methods. We also show the higher order heat trace asymptotics of the perturbed de Rham complex exhibit nontrivial dependence on $\Theta $. We establish similar results for manifolds with boundary imposing suitable boundary conditions and give an equivariant version for the local Lefschetz trace density. In the setting of the Dolbeault complex, one requires $\Theta $ to be a $\bar \partial $ closed $1$-form to define a local index density; we show in contrast to the de Rham complex, that this exhibits a nontrivial dependence on $\Theta $ even in the setting of Riemann surfaces.
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