Pablo Alvarez-Caudevilla, Victor A. Galaktionov
Abstract:
The main goal in this article is to justify that source-type and
other global-in-time similarity solutions of the Cauchy problem
for the fourth-order thin film equation
can be obtained by a continuous deformation (a homotopy path) as
.
This is done by reducing to similarity solutions
(given by eigenfunctions of a rescaled linear operator
)
of the classic bi-harmonic equation
This approach leads to a countable family of various global similarity patterns
of the thin film equation, and describes their oscillatory sign-changing
behav iour by using the known asymptotic properties of the fundamental
solution of bi-harmonic equation.
The branching from
for thin film equation requires Hermitian spectral
theory for a pair
of non-self adjoint operators
and leads to a number of difficult mathematical problems. These include, as
a key part, the problem of multiplicity of solutions, which is under
particular scrutiny.
Submitted April 11, 2014. Published April 10, 2015.
Math Subject Classifications: 35K55, 35B32, 35G20, 35K41, 35K65.
Key Words: Thin film equation; Cauchy problem; source-type similarity solutions;
finite interfaces; oscillatory sign-changing behaviour;
Hermitian spectral theory; branching.
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Pablo Alvarez-Caudevilla Universidad Carlos III de Madrid Av. Universidad 30, 28911-Leganes, Spain email: pacaudev@math.uc3m.es Phone: +34-916249099 | |
Victor A. Galaktionov Department of Mathematical Sciences University of Bath Bath BA2 7AY, UK email: vag@maths.bath.ac.uk Phone: +44-1225826988 |
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