209 citations · 1k across the 28 of their papers we have counts for
9 papers · 1 filter
Conservative Force Fields in Non-Gaussian Statistics
J. M. Silva, R. Silva, J. A. S. Lima
In this letter, we determine the -distribution function for a gas in the presence of an external field of force described by a potential U(). In the case of a dilute ga…
On the width of the last scattering surface
N. Pires, M. A. S. Nobre, J. A. S. Lima
We discuss the physical effects of some accelerated world models on the width of the last scattering surface (LSS) of the cosmic microwave background radiation (CMBR). The models c…
Power Law Stellar Distributions
J. A. S. Lima, R. E. de Souza
The density profiles and other quantities of physical interest for spherically symmetric systems are computed by assuming that a collisionless stellar gas may relax to the non-Gaus…
Nonsingular FRW cosmology and nonlinear electrodynamics
C. S. Camara, M. R. de Garcia Maia, J. C. Carvalho +1
The possibility to avoid the cosmic initial singularity as a consequence of nonlinear effects on the Maxwell eletromagnetic theory is discussed. For a flat FRW geometry we derive t…
On the thickness of a mildly relativistic collisional shock wave
Jose A. S. Lima, Alejandra Kandus, Reuven Opher
We consider an imperfect relativistic fluid which develops a shock wave and discuss its structure and thickness, taking into account the effects of viscosity and heat conduction in…
Scalar field description of decaying- cosmologies
J. M. F. Maia, J. A. S. Lima
The conditions under which cosmologies driven by time varying cosmological terms can be described by a scalar field coupled to a perfect fluid are discussed. An algorithm to recons…