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Mathematische Zeitschrift 262 (2009) 57-90
Gaps in the differential forms spectrum on cyclic coverings
Colette Anné 1, Gilles Carron 1, Olaf Post
(2009)

We are interested in the spectrum of the Hodge-de Rham operator on a cyclic covering $X$ over a compact manifold $M$ of dimension $n+1$. Let $\Sigma$ be a hypersurface in $M$ which does not disconnect $M$ and such that $M-\Sigma$ is a fundamental domain of the covering. If the cohomology group $H^{n/2 (\Sigma)$ is trivial, we can construct for each $N \in \N$ a metric $g=g_N$ on $M$, such that the Hodge-de Rham operator on the covering $(X,g)$ has at least $N$ gaps in its (essential) spectrum. If $H^{n/2}(\Sigma) \ne 0$, the same statement holds true for the Hodge-de Rham operators on $p$-forms provided $p \notin \{n/2,n/2+1\}$.
1 :  Laboratoire de Mathématiques Jean Leray (LMJL)
CNRS : UMR6629 – Université de Nantes – École Centrale de Nantes
Mathématiques/Géométrie différentielle
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0708.3981