#### Filter Results:

- Full text PDF available (38)

#### Publication Year

1995

2017

- This year (1)
- Last 5 years (2)
- Last 10 years (9)

#### Publication Type

#### Co-author

#### Journals and Conferences

Learn More

The ages of two old galaxies (53W091, 53W069) at high redshifts are used to constrain the value of the cosmological constant in a flat universe (ΛCDM) and the density parameter ΩM in Friedmann-Robertson-Walker (FRW) models with no Λ-term. In the case of ΛCDM models, the quoted galaxies yield two lower limits for the vacuum energy density parameter, ΩΛ ≥… (More)

The thermodynamic behavior of vacuum decaying cosmologies is investigated within a manifestly covariant formulation. Such a process corresponds to a continuous irreversible energy flow from the vacuum component to the created matter constituents. It is shown that if the specific entropy per particle remains constant during the process, the equilibrium… (More)

SUMMARY A new Planckian distribution for cosmologies with photon creation is derived using thermodynamics and semiclassical considerations. This spectrum is preserved during the evolution of the universe and compatible with the present spectral shape of the cosmic microwave background radiation(CMBR). Accordingly, the widely spread feeling that cosmologies… (More)

- José Ademir Sales Lima, António Germano, R. W. Abramo
- 1996

Some properties of cosmological models with matter creation are investigated in the framework of the Friedman-Robertson-Walker (FRW) line element. For adiabatic matter creation, as developed by Prigogine and coworkers, we derive a simple expression relating the particle number density n and energy density ρ which holds regardless of the matter creation… (More)

The flat inflationary dust universe with matter creation proposed by Prigogine and coworkers is generalized and its dynamical properties are reexamined. It is shown that the starting point of these models depends critically on a dimensionless parameter Σ, closely related to the matter creation rate ψ. For Σ bigger or smaller than unity flat universes can… (More)

- José Ademir Sales Lima, R . Ricardo da Silva, Angel Plastino
- Physical review letters
- 2001

The kinetic foundations of Tsallis' nonextensive thermostatistics are investigated through Boltzmann's transport equation approach. Our analysis follows from a nonextensive generalization of the "molecular chaos hypothesis." For q>0, the q-transport equation satisfies an H theorem based on Tsallis entropy. It is also proved that the collisional equilibrium… (More)

The concept of Jeans gravitational instability is rediscussed in the framework of nonextensive statistics and its associated kinetic theory. A simple analytical formula generalizing the Jeans criterion is derived by assuming that the unperturbed self-gravitating collisionless gas is kinetically described by the q-parameterized class of power law velocity… (More)

We study the thermodynamic behavior of a decaying scalar field coupled to a relativistic simple fluid. It is shown that if the decay products are represented by a thermalized bath, its temperature evolution law requires naturally a new phenomenological coupling term. This “energy loss” term is the product between the enthalpy density of the thermalized bath… (More)

- Alexandre Felipe, Guilherme Espíndola, Hypolito José Kalinowski, José Ademir Sales Lima, Aleksander S. Paterno
- Optics express
- 2012

This work reports a modified flame-brush technique to fabricate fiber tapers with arbitrary waist profiles. The flame-brush approach is used to produce small step reductions in the fiber diameter, or step-tapers, with a constant speed flame brush sweep, while the fiber is uniformly stretched. Arbitrary waist profiles in tapers are fabricated by… (More)

- José Ademir Sales Lima, S . Basilakos, Florinda M. Costa
- 2017