Transverse totally geodesic submanifolds of the tangent bundle
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It is well-known that if $ξ$ is a smooth vector field on a given Riemannian manifold $M^n$ then $ξ$ naturally defines a submanifold $ξ(M^n)$ transverse to the fibers of the tangent bundle $TM^n$ with Sasaki metric. In this paper, we are interested in transverse totally geodesic submanifolds of the tangent bundle. We show that a transverse submanifold $N^l$ of $TM^n$ ($1 \leq l \leq n$) can be realized locally as the image of a submanifold $F^l$ of $M^n$ under some vector field $ξ$ defined along $F^l$. For such images $ξ(F^l)$, the conditions to be totally geodesic are presented. We show that these conditions are not so rigid as in the case of $l=n$, and we treat several special cases ($ξ$ of constant length, $ξ$ normal to $F^l$, $M^n$ of constant curvature, $M^n$ a Lie group and $ξ$ a left invariant vector field)