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Transactions of the American Mathematical Society
Transactions of the American Mathematical Society
ISSN 1088-6850(online) ISSN 0002-9947(print)

 

Liouville theorems and spectral edge behavior on abelian coverings of compact manifolds


Authors: Peter Kuchment and Yehuda Pinchover
Journal: Trans. Amer. Math. Soc. 359 (2007), 5777-5815
MSC (2000): Primary 35B05, 58J05, 32Q99; Secondary 35J15, 35P05, 32M99, 58J50
Published electronically: July 20, 2007
MathSciNet review: 2336306
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Abstract: The paper describes relations between Liouville type theorems for solutions of a periodic elliptic equation (or a system) on an abelian cover of a compact Riemannian manifold and the structure of the dispersion relation for this equation at the edges of the spectrum. Here one says that the Liouville theorem holds if the space of solutions of any given polynomial growth is finite dimensional. The necessary and sufficient condition for a Liouville type theorem to hold is that the real Fermi surface of the elliptic operator consists of finitely many points (modulo the reciprocal lattice). Thus, such a theorem generically is expected to hold at the edges of the spectrum. The precise description of the spaces of polynomially growing solutions depends upon a `homogenized' constant coefficient operator determined by the analytic structure of the dispersion relation. In most cases, simple explicit formulas are found for the dimensions of the spaces of polynomially growing solutions in terms of the dispersion curves. The role of the base of the covering (in particular its dimension) is rather limited, while the deck group is of the most importance.

The results are also established for overdetermined elliptic systems, which in particular leads to Liouville theorems for polynomially growing holomorphic functions on abelian coverings of compact analytic manifolds.

Analogous theorems hold for abelian coverings of compact combinatorial or quantum graphs.


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Additional Information

Peter Kuchment
Affiliation: Department of Mathematics, Texas A&M University, College Station, Texas 77843-3368
Email: kuchment@math.tamu.edu

Yehuda Pinchover
Affiliation: Department of Mathematics, Technion - Israel Institute of Technology, Haifa 32000, Israel
Email: pincho@techunix.technion.ac.il

DOI: http://dx.doi.org/10.1090/S0002-9947-07-04196-7
PII: S 0002-9947(07)04196-7
Keywords: Elliptic operator, periodic operator, Floquet theory, Liouville theorem, spectrum, abelian cover, holomorphic function, graph, quantum graph
Received by editor(s): June 12, 2005
Published electronically: July 20, 2007
Article copyright: © Copyright 2007 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.