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25 papers · 1 filter
Collapsing shells of radiation in anti-de Sitter spacetimes and the hoop and cosmic censorship conjectures
Jose' P. S. Lemos
Gravitational collapse of radiation in an anti-de Sitter background is studied. For the spherical case, the collapse proceeds in much the same way as in the Minkowski background, i…
Abundance Gradients in the Galactic Disk: a clue to Galaxy Formation
Francesca Matteucci, Cristina Chiappini
We review the observational evidences and the possible theoretical explanations for the abundance gradients in the Galactic disk. In particular, we discuss the implications of abun…
Eikonal profile functions and amplitudes for and scattering
Flavio Pereira, Erasmo Ferreira
The eikonal profile function obtained from the Model of the Stochastic Vacuum is parametrized in a form suitable for comparison with experiment. The amplitude and the extend…
Gravitational Collapse of Perfect Fluid
J. F. Villas da Rocha, Anzhong Wang, N. O. Santos
The spherical gravitational collapse of a compact packet consisting of perfect fluid is studied. The spacetime outside the fluid packet is described by the out-going Vaidya radiati…
The Earliest Phases of Galaxy Evolution
Cristina Chiappini, Francesca Matteucci, Timothy Beers +1
In this paper we study the very early phases of the evolution of our Galaxy by means of a chemical evolution model which reproduces most of the observational constraints in the sol…
Cluster vs. Field Elliptical Galaxies and Clues on their Formation
Mariangela Bernardi, Alvio Renzini, Luiz N. da Costa +6
Using new observations for a sample of 931 early-type galaxies we investigate whether the \mg2--\so relation shows any dependence on the local environment. The galaxies have been a…