Periodicity and Inertial Manifolds for Navier-Stokes Flows on $d$-Spheres

Abstract: Consider a $d$-sphere $\mathbb{S}<sup>d$ and denote by $Γ(T\mathbb{S}<sup>d)$ the set of all vector fields on $\mathbb{S}<sup>d$. We study the Navier-Stokes equations (NSE): $$\partial_t u + \nabla_u u + grad π= \mathbfΔ u + \operatorname{div} f(\cdot, t);\, \operatorname{div} u=0,$$ for the vector field $u(\cdot, t)\in Γ(T\mathbb{S}<sup>d)$, where $\mathbfΔ$ denotes the Ebin-Marsden Laplace operator defined by $$\mathbfΔ u= \operatorname{div} (\nabla u + \nabla u<sup>t)<sup>{\sharp}$$, and $\operatorname{div} f(\cdot, t)$ is the periodic external force. We investigate the Navier-Stokes equations in the framework of $L<sup>p$-spaces over vector fields on $\mathbb{S}<sup>d$ and prove the existence and uniqueness of a periodic solution to such equations. Moreover, exploiting the distribution of eingenvalues of Ebin-Marsden Laplace operator we show the existence of an inertial manifold for solutions around that solution.