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First-order corrections to the homogenised eigenvalues of a periodic composite medium. A convergence proof
Journal article   Peer reviewed

First-order corrections to the homogenised eigenvalues of a periodic composite medium. A convergence proof

Shari Moskow and Michael Vogelius
Proceedings of the Royal Society of Edinburgh. Section A. Mathematics, v 127(6), pp 1263-1299
1997

Abstract

Let λε be a Dirichlet eigenvalue of the ‘periodically, rapidly oscillating’ elliptic operator –∇·(a(x/ε)∇) and let ∇ be a corresponding (simple) eigenvalue of the homogenised operator –∇·(A∇). We characterise the possible limit points of the ratio (λε–λ)/ε as ε→0. Our characterisation is quite explicit when the underlying domain is a (planar) convex, classical polygon with sides of rational or infinite slopes. In particular, in this case it implies that there is often a continuum of such limit points.

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Mathematics
Mathematics, Applied
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