Abstract
In this paper, we establish the existence and uniqueness of a time
periodic solution to the full compressible quantum Euler equations.
First, we prove the existence of time periodic solutions under some
smallness assumptions imposed on the external force in a periodic domain
by a regularized approximation scheme and the Leray-Schauder degree
theory. Then the result is generalized to
$\mathbb{R}^{3}$ by adapting a limiting method
and a diagonal argument. The uniqueness of the time periodic solutions
is also given. Compared to classical Euler equations, the third-order
quantum spatial derivatives are considered which need some elaborated
treatments thereof in obtaining the highest-order energy estimates.