Periodic solutions to singular second order differential equations: the repulsive case

Robert Hakl, Pedro J. Torres, Manuel Zamora


This paper is devoted to study the existence of periodic solutions to the second-order differential
equation $u''+f(u)u'+g(u)=h(t,u)$, where $h$ is a Carathéodory function and $f,g$ are continuous functions
on $(0,\infty)$ which may have singularities at zero. The repulsive case is considered.
By using Schaefer's fixed point theorem, new conditions for existence of periodic solutions are obtained.
Such conditions are compared with those existent in the related literature and applied to
the Rayleigh-Plesset equation, a physical model for the oscillations of a spherical bubble in a liquid under
the influence of a periodic acoustic field. Such a model has been the main motivation of this work.


Singular nonlinear boundary value problems; positive solutions; periodic solutions

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