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An inverse problem for the three-dimensional multi-connected vibrating membrane with Robin boundary conditions
Faculty
Science
Year:
2003
Type of Publication:
Article
Pages:
233-249
Authors:
ZAYED, EME
Journal:
QUARTERLY OF APPLIED MATHEMATICS AMER MATHEMATICAL SOC
Volume:
61
Research Area:
Mathematics
ISSN
ISI:000182765700003
Keywords :
, inverse problem , , three-dimensional multi-connected vibrating membrane
Abstract:
This paper deals with the very interesting problem concerning the influence of the boundary conditions on the distribution of the eigenvalues of the negative Laplacian in R-3. The trace of the heat semigroup theta(t) = Sigma(upsilon=1)(infinity) exp(-tmu(upsilon)), where \{mu(upsilon)\}(upsilon=1)(infinity) are the eigenvalues of the negative Laplacian -del(2) = E-beta=1(3)(partial derivative/partial derivativex(beta))(2) in the (x(1), x(2), x(3))-space, is studied for a general multiply-connected bounded domain Q in R' surrounding by simply connected bounded domains Omega(j) with smooth bounding surfaces S-j (j = 1,..., n), where a finite number of piecewise smooth Robin boundary conditions on the piecewise smooth components S-i{*} (i = 1 + k(j- 1),. . . k(j)) of the bounding surfaces S-j is considered, such that kj S-j = U-i=1+kj-1(kj) S-i{*}, where k(0) = 0. Some applications of theta(t) for an ideal gas enclosed in the multiply-connected bounded container Q with Robin boundary conditions are given. We show that the asymptotic expansion of theta(t) for short-time t plays an important role in investigating the influence of the finite container Omega on the thermodynamic quantities of an ideal gas.
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