Geodesic
Equivariant Morse relations
Homology, homotopy, and applications, Tome 9 (2007) no. 1, pp. 467-483.

Voir la notice de l'article provenant de la source International Press of Boston

For a finite group $G$, Costenoble and Waner defined a cellular (co-)homology theory for $G$-spaces $X$, which is graded on virtual representations of the equivariant fundamental groupoid $π_G(X)$. Using this homology, we associate an infinite (Morse) series with an equivariant Morse function $f$ defined on a closed Riemannian $G$-manifold $M$. Wasserman has shown that when the critical locus of $f$ is a disjoint union of orbits, $M$ has a canonical decomposition into disc bundles. We show that if this decomposition “corresponds” to a virtual representation $γ$ of $π_G(M)$, then the Morse relations are satisfied by the “$γ$th homology groups”. For semi-free $G$-actions, we characterise the Morse functions which naturally give rise to such representations $γ$ of $π_G(M)$. We also show that corresponding to any equivariant Morse function on a $Z_2$-manifold, it is always possible to define virtual representations $γ$ so that the Morse relation is satisfied by the “$γ$th homology groups”. In particular, the Morse relation is satisfied by Bredon homology.
DOI : 10.4310/HHA.2007.v9.n1.a19
Classification : 55N25, 55N91, 57R70, 57R91
Keywords: equivariant Morse function, $RO(π_G(X))$ graded homology, Morse relation 
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     pages = {467--483},
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Mahuya Datta; Neeta Pandey. Equivariant Morse relations. Homology, homotopy, and applications, Tome 9 (2007) no. 1, pp. 467-483. doi : 10.4310/HHA.2007.v9.n1.a19. http://geodesic.mathdoc.fr/articles/10.4310/HHA.2007.v9.n1.a19/

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