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Some new reflections on Mr. Palomar
Orfeu Bertolami
The character Mr. Palomar, the alter-ego of the Italian author Italo Calvino, appeared for the first time in 1975 on the pages of the "Il Corriere della Sera", and then more or les…
Non-minimal curvature-matter couplings in modified gravity
Orfeu Bertolami, Tiberiu Harko, Francisco S. N. Lobo +1
Recently, in the context of f(R) modified theories of gravity, it was shown that a curvature-matter coupling induces a non-vanishing covariant derivative of the energy-momentum, im…
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…
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…