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9 papers · 1 filter
Noncommutative Quantum Cosmology
C. Bastos, O. Bertolami, N. Dias +1
One presents a phase-space noncommutative extension of Quantum Cosmology in the context of a Kantowski-Sachs (KS) minisuperspace model. We obtain the Wheeler-DeWitt (WDW) equation…
A geometric approach to Conn's linearization theorem
Marius Crainic, Rui Loja Fernandes
We give a soft geometric proof of the classical result due to Conn stating that a Poisson structure is linearizable around a singular point (zero) at which the isotropy Lie algebra…
Thermal Analysis of the Pioneer Anomaly: A method to estimate radiative momentum transfer
Orfeu Bertolami, Frederico Francisco, Paulo J. S. Gil +1
We present a methodology based on point-like Lambertian sources that enables one to perform a reliable and comprehensive estimate of the overall thermally induced acceleration of t…
Vacuum effects in a vibrating cavity: time refraction, dynamical Casimir effect, and effective Unruh acceleration
J. T. Mendonca, G. Brodin, M. Marklund
Two different quantum processes are considered in a perturbed vacuum cavity: time refraction and dynamical Casimir effect. They are shown to be physically equivalent, and are predi…
Nonminimal coupling of perfect fluids to curvature
Orfeu Bertolami, Francisco S. N. Lobo, Jorge Páramos
In this work, we consider different forms of relativistic perfect fluid Lagrangian densities, that yield the same gravitational field equations in General Relativity. A particularl…
WMAP5 constraints on the unified model of dark energy and dark matter
T. Barreiro, O. Bertolami, P. Torres
We derive constraints on the parameter space of the unified model of dark energy and dark matter, the Generalized Chaplygin Gas (GCG), from the amplitudes and positions of the firs…