1k citations · 2k across the 25 of their papers we have counts for
9 papers · 1 filter
Phase-Space Noncommutative Quantum Cosmology
Catarina Bastos, Orfeu Bertolami, Nuno Costa Dias +1
We present a noncommutative extension of Quantum Cosmology and study the Kantowski-Sachs (KS) cosmological model requiring that the two scale factors of the KS metric, the coordina…
Galileo satellite constellation and extensions to General Relativity
J. Paramos, O. Bertolami
We consider the impact of some known extensions of General Relativity in observables that will be available with the Galileo positioning systems, and draw conclusions as to the pos…
Solar system tests of scalar field models with an exponential potential
J. Paramos, O. Bertolami
We consider a scenario where a scalar field has dynamics ruled by an exponential potential, such as those arising from some quintessence type models, and aim at obtaining phenomeno…
Dark Energy-Dark Matter Interaction from the Abell Cluster A586 and violation of the Equivalence Principle
Morgan Le Delliou, O. Bertolami, F. Gil Pedro
We find that the Abell Cluster A586 exhibits evidence of the interaction between dark matter and dark energy and argue that this interaction suggests evidence of violation of the E…
Extra force in modified theories of gravity
Orfeu Bertolami, Christian G. Boehmer, Tiberiu Harko +1
The equation of motion for test particles in modified theories of gravity is derived. By considering an explicit coupling between an arbitrary function of the scalar curvatu…
A Curvature Principle for the interaction between universes
Orfeu Bertolami
We propose a Curvature Principle to describe the dynamics of interacting universes in a multi-universe scenario and show, in the context of a simplified model, how interaction driv…