Spacelike singularities and hidden symmetries of gravity.
Space-time distributions.
Space-times admitting a covariantly constant spinor field
Special Functions and Pathways for Problems in Astrophysics: An Essay in Honor of A.M. Mathai
The paper provides a review of A.M. Mathai's applications of the theory of special functions, particularly generalized hypergeometric functions, to problems in stellar physics and formation of structure in the Universe and to questions related to reaction, diffusion, and reaction-diffusion models. The essay also highlights Mathai's recent work on entropic, distributional, and differential pathways to basic concepts in statistical mechanics, making use of his earlier research results in information...
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.