output
19922026
researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions
Showing 1997Show all

20 papers · 1 filter

nucl-th1997★ 10 cited

Can we see the hadron-quark transition happening in neutron stars?

F. Grassi

In order to actually see the hadron-quark transition happening in a neutron star, we point out and study two static conditions (the transition hadronic density must be lower than t…

nucl-th1997★ 13 cited

Confronting particle emission scenarios with strangeness data

F. Grassi, O. Socolowski

We show that a hadron gas model with continuous particle emission instead of freeze out may solve some of the problems (high values of the freeze out density and specific net charg…

gr-qc1997★ 7 cited

Chaos and Taub-NUT related spacetimes

P. S. Letelier, W. M. Vieira

The occurrence of chaos for test particles moving in a Taub-NUT spacetime with a dipolar halo perturbation is studied using Poincaré sections. We find that the NUT parameter (magne…

physics.optics1997★ 122 cited

On Localized "X-shaped" Superluminal Solutions to Maxwell Equations

Erasmo Recami

In this paper we extend for the case of Maxwell equations the "X-shaped" solutions previously found in the case of scalar (e.g., acoustic) wave equations. Such solutions are locali…

gr-qc1997★ 42 cited

Chaos and Rotating Black Holes with Halos

P. S. Letelier, W. M. Vieira

The occurrence of chaos for test particles moving around a slowly rotating black hole with a dipolar halo is studied using Poincaré sections. We find a novel effect, particles with…

cond-mat1997★ 27 cited

Dynamics of Stripes in Doped Antiferromagnets

C. Morais Smith, Y. Dimashko, N. Hasselmann +1

We study the dynamics of the striped phase, which has previously been suggested to be the ground state of a doped antiferromagnet. Starting from the t-J model, we derive the classi…

gr-qc1997★ 4 cited

Two Kerr black holes with axisymmetric spins: An improved Newtonian model for the head-on collision and gravitational radiation

Marcelo E. Araujo, Patricio S. Letelier, Samuel R. Oliveira

We present a semi-analytical approach to the interaction of two (originally) Kerr black holes through a head-on collision process. An expression for the rate of emission of gravita…

gr-qc1997★ 35 cited

Superposition of Weyl solutions: The equilibrium forces

Patricio. S. Letelier, Samuel R. Oliveira

Solutions to the Einstein equation that represent the superposition of static isolated bodies with axially symmetry are presented. The equations nonlinearity yields singular struct…

cond-mat.mes-hall1997★ 8 cited

Solution of the X-ray edge problem for 2D electrons in a magnetic field

H. Westfahl, A. O. Caldeira, D. Baeriswyl +1

The absorption and emission spectra of transitions between a localized level and a two-dimensional electron gas, subjected to a weak magnetic field, are calculated analytically. Ad…

astro-ph1997★ 16 cited

Are High Energy Cosmic Rays Magnetic Monopoles?

C. O. Escobar, R. A. Vázquez

We argue that magnetic monopoles can not be associated to the highest energy cosmic rays as recently suggested. Both the observed spectrum and the arrival direction disagree with o…

hep-ph1997★ 62 cited

Reheating in the Presence of Noise

V. Zanchin, A. Maia, W. Craig +1

Explosive particle production due to parametric resonance is a crucial feature of reheating in inflationary cosmology. Coherent oscillations of the inflaton field act as a periodic…

gr-qc1997★ 10 cited

Textures and Newtonian Gravity

Eduardo Guéron, P. S. Letelier

Newtonian theory is used to study the gravitational effects of a texture, in particular the formation of massive structures.

cond-mat1997★ 13 cited

Cumulant expansion of the periodic Anderson model in infinite dimension

M. E. Foglio, M. S. Figueira

The diagrammatic cumulant expansion for the periodic Anderson model with infinite Coulomb repulsion () is considered here for an hypercubic lattice of infinite dimension…

hep-ph1997★ 4 cited

High energy parton-parton amplitudes from lattice QCD and the stochastic vacuum model

A. F. Martini, M. J. Menon, D. S. Thober

Making use of the gluon gauge-invariant two-point correlation function, recently determined by numerical simulation on the lattice in the quenched approximation and the stochastic…

hep-ph1997★ 17 cited

Evidence for eikonal zeros in the momentum transfer space

P. A. S. Carvalho, M. J. Menon

We present the results of fitting elastic differential cross section data at 23.5 62.5 GeV with a novel analytic parametrization for the scattering amplit…

gr-qc1997★ 46 cited

Chaos in black holes surrounded by gravitational waves

P. S. Letelier, W. M. Vieira

The occurrence of chaos for test particles moving around Schwarzschild black holes perturbed by a special class of gravitational waves is studied in the context of the Melnikov met…

hep-ph1997★ 14 cited

Multiple diffraction model for proton-proton elastic scattering and total cross section extrapolations to cosmic-ray energies

A. F. Martini, M. J. Menon

We analyse pp elastic scattering data at the highest accelerator energy region (between 10 and 63 GeV) through a multiple diffraction approach. The use of Martin's formula in a mod…

gr-qc1997★ 28 cited

On the integrability of halo dipoles in gravity

Werner M. Vieira, Patricio S. Letelier

We stress that halo dipole components are nontrivial in core-halo systems in both Newton's gravity and General Relativity. To this end, we extend a recent exact relativistic model…

math-ph1997★ 11 cited

Hypercomplex Group Theory

Stefano De Leo

Due to the noncommutative nature of quaternions and octonions we introduce barred operators. This objects give the opportunity to manipulate appropriately the hypercomplex fields.…

funct-an1997★ 11 cited

Local Hypercomplex Analyticity

Stefano De Leo, Pietro Rotelli

The notion of analyticity is studied in the context of hypercomplex numbers. A critical review of the problems arising from the conventional approach is given. We describe a local…