2k citations · 12k across the 281 of their papers we have counts for
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Cosmological acceleration, varying couplings, and Lorentz breaking
Orfeu Bertolami, Ralf Lehnert, Robertus Potting +1
Many candidate fundamental theories contain scalar fields that can acquire spacetime-varying expectation values in a cosmological context. Such scalars typically obey Lorentz-viola…
The Pioneer anomaly in the context of the braneworld scenario
O. Bertolami, J. Páramos
We examine the Pioneer anomaly - a reported anomalous acceleration affecting the Pioneer 10/11, Galileo and Ulysses spacecrafts - in the context of a braneworld scenario. We show t…
Three Key Tests to Gravity
O. Bertolami
Three presumably unrelated open questions concerning gravity and the structure of the Universe are here discussed: 1) To which extent is Lorentz invariance an exact symmetry ? 2) W…
Noncommutative field theory and violation of translation invariance
O. Bertolami, L. Guisado
Noncommutative field theories with commutator of the coordinates of the form are studied. Explicit Lorentz invariance is mantained considering …
Generalized Chaplygin Gas Model: Dark Energy - Dark Matter Unification and CMBR Constraints
M. C. Bento, O. Bertolami, A. A. Sen
The generalized Chaplygin gas (GCG) model allows for an unified description of the recent accelerated expansion of the Universe and the evolution of energy density perturbations. T…
WMAP Constraints on the Generalized Chaplygin Gas Model
M. C. Bento, O. Bertolami, A. A. Sen
The generalized Chaplygin gas (GCG) model explains the recent accelerated expansion of the Universe via an exotic background fluid whose equation of state is given by p=-A/ρ^α, whe…