Al-Zamil, Qusay
(2010)
*$X_M$-Harmonic Cohomology and Equivariant Cohomology on Riemannian Manifolds With Boundary.*
[MIMS Preprint]

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## Abstract

Given a Riemannian manifold $M$ with boundary and a torus $G$ which acts by isometries on $M$ and let $X$ be in the Lie algebra of $G$ and corresponding vector field $X_M$ on $M$, we consider Witten's coboundary operator $\d_{X_M} = \d+\iota_{X_M}$ on invariant forms on $M$. In \cite{Our paper} we introduce the absolute $X_M$-cohomology $H^*_{X_M}(M)= H^*(\Omega^{*}_G,\,\d_{X_M})$ and the relative $X_M$-cohomology $H^*_{X_M}(M,\,\partial M)= H^*(\Omega^{*}_{G,D},\,\d_{X_M})$ where the $D$ is for Dirichlet boundary condition and $\Omega^{*}_G$ is the invariant forms on M. Let $\delta_{X_M}$ be the adjoint of $d_{X_M}$ and the resulting \emph{Witten-Hodge-Laplacian} is $\Delta_{X_M}= \d_{X_M}\delta_{X_M} + \delta_{X_M}\d_{X_M}$ where the space $\ker\Delta_{X_M}$ is called the $X_M$-harmonic forms. In this paper, we prove that the (even/odd) $X_M$-harmonic cohomology which is the $X_M$-cohomology of the subcomplex $(\ker\Delta_{X_M},\d_{X_M})$ of the complex $(\Omega^{*}_G,\d_{X_M})$ is enough to determine the total absolute and relative $X_M$-cohomology. As conclusion, we infer that the free part of the absolute and relative equivariant cohomology groups are determined by the (even/odd) $X_M$-harmonic cohomology when the set of zeros of the corresponding vector field $X_M$ is equal to the fixed point set $F$ for the $G$-action.

Item Type: | MIMS Preprint |
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Uncontrolled Keywords: | Algebraic topology, equivariant topology, manifolds with boundary, cochain complex, group actions, equivariant cohomology. |

Subjects: | MSC 2010, the AMS's Mathematics Subject Classification > 55 Algebraic topology MSC 2010, the AMS's Mathematics Subject Classification > 57 Manifolds and cell complexes |

Depositing User: | Mr. Qusay Soad Abdul-Aziz Al-Zamil |

Date Deposited: | 10 Nov 2010 |

Last Modified: | 08 Nov 2017 18:18 |

URI: | https://eprints.maths.manchester.ac.uk/id/eprint/1255 |

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