Spectral methods for numerical relativity.
Spherical detectors of gravitational waves
Resonant mass detectors of GWs of spherical shape constitute the fourth generation of such kind of antennae, and are scheduled to start operation in the near future. In this communication I present a general description of the fundamental principles underlying the physics of this kind of detector, as well as of the motion sensor set suitable to retrieve the information generated by the incidence of a GW on the antenna.
Spherical symmetry in classical and quantum Galilei general relativity
Spherically symmetric generalized Lagrange metrics.
Spinorial matter and general relativity theory
Spinorial solution associated to a radially symmetric radiation field in general relativity
Spinors on in supergravity
Stabilité par déformation non-linéaire de la métrique de Minkowski
Stationary black holes: Uniqueness and beyond.
Stellar pulsations and gravitational waves
Pulsating stars are important sources of information for astrophysics. Nearly every star undergoes some kind of pulsation from the early stages of its formation until the very late ones i.e. the catastrophic creation of a supercompact object (white dwarf, neutron star or black hole). Pulsations of supercompact objects are of great importance for relativistic astrophysics since these pulsations are accompanied by the emission of gravitational radiation. In this review we shall discuss various features...
Study of nonlinear wave processes in plasmas using the formalism of a special Lorentz transformation for a space-independent frame.
Subgroups of the group of generalized Lorentz transformations and their geometric invariants.
Sui fondamenti dell’ottica relativistica
Il lavoro deduce, in ambito relativistico, le proprietà fondamentali di un flusso luminoso (congruenza nulla) mediante tecniche anolonome reali [2,3] e precisamente: caratteristiche geometrico-cinematiche del flusso (assolute e relative), teorema di Sachs [6] e proprietà dei nastri luminosi, con particolare riguardo ai parametri ottici e di deformazione, in spazi-tempo particolari (stazionarietà relativa, flussi geodetici, riferimenti trasportati per parallelismo dalla luce).
Sui fronti d'onda nei corpi girevoli intorno ad un asse fisso.
Sulla legge di gravitazione universale. Nota I
Without making recourse to Newton's law of gravitation and starting from the concept of gravitational force, the concepts of active gravitational mass and of passive gravitational mass are introduced. Furthermore it is proved that they can be identified and that in Newton's law of gravitation the linear dependence on masses necessarily follows from the principle of superposition of simultaneous forces and from Newton's third law of dynamics.
Superconformal-like transformations and nonlinear realizations.
Sur certaines solutions particulières transcendantes des équations d'Einstein
Sur la géométrie de la singularité initiale des espaces-temps plats globalement hyperboliques
On étudie le comportement asymptotique des niveaux d’une fonction temps quasi-concave, définie sur un espace-temps globalement hyperbolique maximal plat de dimension trois, admettant une hypersurface de Cauchy de genre . On donne une réponse positive à une conjecture posée par Benedetti et Guadagnini dans [7]. Plus précisément, on montre que les niveaux d’une telle fonction temps convergent au sens de la topologie de Hausdorff-Gromov équivariante vers un arbre réel. On montre de plus que la limite...
Sur la résolubilité locale des équations d'Einstein
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