Locally symmetric submanifolds lift to spectral manifolds
  In this work we prove that every locally symmetric smooth submanifold gives rise to a naturally defined smooth submanifold of the space of symmetric matrices, called spectral manifold, consisting of all matrices whose ordered vector of eigenvalues belongs to the locally symmetric manifold. We also present an explicit formula for the dimension of the spectral manifold in terms of the dimension and the intrinsic properties of the locally symmetric manifold. 
Aris Daniilidis, Jerome Malick (INRIA Grenoble Rh\^one-Alpes / LJK   Laboratoire Jean Kuntzmann), Hristo Sendov
math.OC math.DG