165 citations · 1.1k across the 59 of their papers we have counts for
4 papers · 1 filter
Fundamental units of length and time
A. N. Bernal, M. P. Lopez, M. Sanchez
Ideal rods and clocks are defined as an infinitesimal symmetry of the spacetime. Since no a priori geometric structure is considered, all the possible models of spacetime are obtai…
Geodesic connectedness of semi-Riemannian manifolds
Miguel Sanchez
The question whether a Riemannian manifold is geodesically connected can be studied from geometrical as well as variational methods, and accurate results can be obtained by using t…
Convexity of domains of Riemannian manifolds
Rossella Bartolo, Anna Germinario, Miguel Sanchez
In this paper we analyze the problem of the geodesic connectedness of subsets of Riemannian manifolds. By using variational methods, the geodesic connectedness of open domains (who…
Geodesic connectedness and conjugate points in GRW spacetimes
J. L. Flores, M. Sanchez
Given two points of a Generalized Robertson-Walker spacetime, the existence, multiplicity and causal character of geodesic connecting them is characterized. Conjugate points of suc…