Scalar curvature on lightlike hypersurfaces.
Several cohomology algebras connected with Poisson structure.
Some Nonsemisymmetric Ricci-semisymmetric Warped Product Hypersurfaces
Some properties of Jordan-Ehlers spacetime.
Some remarks on the physical structure of energy-momentum tensors in general relativity
Some representations of affine conformal transformations of Minkowski space.
Special Einstein’s equations on Kähler manifolds
This work is devoted to the study of Einstein equations with a special shape of the energy-momentum tensor. Our results continue Stepanov’s classification of Riemannian manifolds according to special properties of the energy-momentum tensor to Kähler manifolds. We show that in this case the number of classes reduces.
Spinorial solution associated to a radially symmetric radiation field in general relativity
Subgroups of the group of generalized Lorentz transformations and their geometric invariants.
Sul teorema di Liouville per deformazioni conformi
Sur quelques univers dont l'espace est localement symétrique
Sur une nouvelle expression de la solution générale des équations d'Einstein avec champ de Maxwell non singulier, aligné, sans source et avec constante cosmologique, en type D
Symmetry problems 2
Some symmetry problems are formulated and solved. New simple proofs are given for some symmetry problems studied earlier. One of the results is as follows: if a single-layer potential of a surface, homeomorphic to a sphere, with a constant charge density, is equal to c/|x| for all sufficiently large |x|, where c > 0 is a constant, then the surface is a sphere.
Synge-Beil and Riemann-Jacobi jet structures with applications to physics.