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- University of LisbonPT1.3k papers
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37 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…
Percolation approach to phase transitions in high energy nuclear collisions
A. Rodrigues, R. Ugoccioni, J. Dias de Deus
We study continuum percolation in nuclear collisions for the realistic case in which the nuclear matter distribution is not uniform over the collision volume, and show that the per…
Note on Shadowing and Diffraction in Deep-Inelastic Lepton Scattering
G. Piller, L. Ferreira, W. Weise
We discuss the close relation between shadowing in deep-inelastic lepton-nucleus scattering and diffractive photo- and leptoproduction of hadrons from free nucleons. We show that t…
Measurements of Omega and Lambda from 42 High-Redshift Supernovae
S. Perlmutter, G. Aldering, G. Goldhaber +29
We report measurements of the mass density, Omega_M, and cosmological-constant energy density, Omega_Lambda, of the universe based on the analysis of 42 Type Ia supernovae discover…
Yukawa coupling corrections to the decay
Andrew Akeroyd, Abdesslam Arhrib, El-Mokhtar Naimi
We compute the fermionic radiative contributions to the decay in the framework of models with two Higgs doublets (2HDM), for the case of an on-shell and off-…
Primordial Magnetic Fields via Spontaneous Breaking of Lorentz Invariance
O. Bertolami, D. F. Mota
Spontaneous breaking of Lorentz invariance compatible with observational limits may realistically take place in the context of string theories, possibly endowing the photon with a…