We develop the theory of weighted Ricci curvature in a Lorentz-Finsler framework and extend classical singularity theorems general relativity. In order to reach this result, we generalize Jacobi, Riccati Raychaudhuri equations Finsler spacetimes study their implications for existence conjugate points along causal geodesics. also show version Bonnet-Myers theorem based on generalized Bishop ineq...

Complex numbers enter fundamental physics in at least two rather distinct ways. They are needed in quantum theories to make linear diier-ential operators into Hermitian observables. Complex structures appear also, through Hodge duality, in vector and spinor spaces associated with space-time. This paper reviews some of these notions. Charge conjugation in multidimensional geometries and the appe...

The complete on-shell action of topological Einstein-Maxwell gravity in four-dimensions is presented. It is shown explicitly how this theory for SU(2) holonomy manifolds arises from four-dimensional Euclidean N = 2 supergravity. The twisted local BRST symmetries and twisted local Lorentz symmetries are given and the action and stress tensor are shown to be BRST-exact. A set of BRST-invariant to...

We start from a given Lorentz metric and a vector field of world lines along which observers and measure devices may move. We describe a procedure to associate one-particle Hilbert spaces and one-particle Hamiltonians to space-like hypersurfaces using a transi, tion to a Riemannian metric. With the aid of suitable boundary conditions one can confine the particle within a world tube ("box quanti...

In this paper, we consider the component matrix of a symmetric covariant tensor field of order 2 on a pseudoRiemannian manifold relative to orthonormal frame. We prove that if the Jordan index of the tensor field is constant on a neighborhood, then there is a locally orthonormal frame field such that the component matrix of the tensor field has same simple form at each point in the neighborhood...

Complex numbers enter fundamental physics in at least two rather distinct ways. They are needed in quantum theories to make linear differential operators into Hermitian observables. Complex structures appear also, through Hodge duality, in vector and spinor spaces associated with space-time. This paper reviews some of these notions. Charge conjugation in multidimensional geometries and the appe...

We show that a necessary condition for the completeness of the geodesics of left invariant pseudo-Riemannian metrics on Lie groups is also sufficient in the case of 3-dimensional unimodular Lie groups, and not sufficient for 3-dimensional non-unimodular Lie groups. As a consequence it is possible to identify, amongst the compact locally homogeneous Lorentz 3-manifolds with non compact (local) i...