Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR835 papers
- The Ohio State UniversityUS812 papers
- Universidade de São PauloBR798 papers
- Panjab UniversityIN636 papers
- Universidade Federal do ABCBR635 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di TorinoIT634 papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR603 papers
- Benemérita Universidad Autónoma de PueblaMX594 papers
- European Organization for Nuclear ResearchCH583 papers
- Wayne State UniversityUS576 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di BolognaIT570 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di CataniaIT565 papers
16 papers · 1 filter
Ehlers-Harrison transformations and black holes in Dilaton-Axion Gravity with multiple vector fields
D. V. Gal'tsov, P. S. Letelier
Dilaton-axion gravity with vector fields is studied on space-times admitting a timelike Killing vector field. Three-dimensional sigma-model is derived in terms of Kähler g…
Bound states due to an accelerated mirror
Alberto Saa, Marcelo Schiffer
We discuss an effect of accelerated mirrors which remained hitherto unnoticed, the formation of a field condensate near its surface for massive fields. From the view point of an ob…
Quantum dynamics of non-relativistic particles and isometric embeddings
Alberto Saa
It is considered, in the framework of constrained systems, the quantum dynamics of non-relativistic particles moving on a d-dimensional Riemannian manifold M isometrically embedded…
Landau level bosonization of a 2D electron gas
H. Westfahl, A. H. Castro Neto, A. O. Caldeira
In this work we introduce a bosonization scheme for the low energy excitations of a 2D interacting electron gas in the presence of an uniform magnetic field under conditions where…
D-Dimensional Radiative Plasma: A Kinetic Approach
A. Maia, J. A. S. Lima
The covariant kinetic approach for the radiative plasma, a mixture of a relativistic moving gas plus radiation quanta (photons, neutrinos, or gravitons) is generalized to D spatial…
On the Equivalence between the Effective Potential and Zero-Point Energy
Jose Alexandre Nogueira, Adolfo Maia
We investigate a possible difference between the effective potential and zero-point energy. We define the zero-point ambiguity (ZPA) as the difference between these two definitions…
Propagating torsion from first principles
Alberto Saa
A propagating torsion model is derived from the requirement of compatibility between minimal action principle and minimal coupling procedure in Riemann-Cartan spacetimes. In the pr…
Curvature and Chaos in General Relativity
Werner M. Vieira, Patricio S. Letelier
We clarify some points about the systems considered by Sota, Suzuki and Maeda in Class. Quantum Grav. 13, 1241 (1996). Contrary to the authors' claim for a non-homoclinic kind of c…
Addendum: Chaos around a Hénon-Heiles-Inspired Exact Perturbation of a Black Hole
Werner M. Vieira, Patricio S. Letelier
We find that the model of a black hole plus an exterior halo of quadrupoles and octopoles recently proposed by us is more chaotic than previously detected. In fact, the quadrupolar…
Kinematics and hydrodynamics of spinning particles
Erasmo Recami, Giovanni Salesi
In the first part (Sections 1 and 2) of this paper --starting from the Pauli current, in the ordinary tensorial language-- we obtain the decomposition of the non-relativistic field…
Velocity field and operator in (non relativistic) quantum mechanics
Giovanni Salesi, Erasmo Recami
Starting from the formal expressions of the hydrodynamical (or ``local'') quantities employed in the applications of Clifford Algebras to quantum mechanics, we introduce --in terms…
Dirac-Hestenes spinor fields in Riemann-Cartan spacetime
W. A. Rodrigues, Q. A. G. de Souza, J. Vaz +1
In this paper we study Dirac-Hestenes spinor fields (DHSF) on a four-dimensional Riemann-Cartan spacetime (RCST). We prove that these fields must be defined as certain equivalence…
Study of chaos in hamiltonian systems via convergent normal forms
Werner M. Vieira, Alfredo M. O. de Almeida
We use Moser's normal forms to study chaotic motion in two-degree hamiltonian systems near a saddle point. Besides being convergent, they provide a suitable description of the cyli…
On the Existence of Undistorted Progressive Waves (UPWs) of Arbitrary Speeds in Nature
W. A. Rodrigues, J. -Y. Lu
We present the theory, the experimental evidence, and fundamental physical consequences concerning the existence of families of undistorted progressive waves (UPWs) of arbitrary sp…
Chaos around a Hénon-Heiles-inspired exact perturbation of a black hole
Werner M. Vieira, Patricio S. Letelier
A solution of the Einstein's equations that represents the superposition of a Schwarszchild black hole with both quadrupolar and octopolar terms describing a halo is exhibited. We…
Composition of Primary Cosmic Rays Beyond the ``Knee''from Emulsion Chamber Observations
C. G. S. Costa, F. Halzen, J. Bellandi +1
We show that the simplest assumptions for the dynamics of particle production allow us to understand the fluxes of hadrons and photons at mountain altitudes as well as the structur…