2k citations · 12k across the 281 of their papers we have counts for
17 papers · 1 filter
Dark Energy-Dark Matter Interaction from the Abell Cluster A586
Orfeu Bertolami, Francisco Gil Pedro, Morgan Le Delliou
We find that deviation from the virial equilibrium of the Abell Cluster A586 yields evidence of the interaction between dark matter and dark energy. We argue that this interaction…
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…
Perturbative approach for mass varying neutrinos coupled to the dark sector in the generalized Chaplygin gas scenario
Alex E. Bernardini, O. Bertolami
We suggest a perturbative approach for generic choices for the universe equation of state and introduce a novel framework for studying mass varying neutrinos (MaVaN's) coupled to t…
Non-minimal coupling as a mechanism for spontaneous symmetry breaking on the brane
Orfeu Bertolami, Carla Carvalho
Motivated by the dimensional asymmetry characteristic of braneworlds, we populate the bulk spacetime with matter scalar fields, both real and complex, and couple them non-minimally…
Quantum Physics Exploring Gravity in the Outer Solar System: The Sagas Project
P. Wolf, Ch. J. Bordé, A. Clairon +52
We summarise the scientific and technological aspects of the SAGAS (Search for Anomalous Gravitation using Atomic Sensors) project, submitted to ESA in June 2007 in response to the…
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…
Do f(R) theories matter?
O. Bertolami, J. Paramos
We consider a modified action functional with a non-minimum coupling between the scalar curvature and the matter Lagrangian, and study its consequences on stellar equilibrium. Part…
The Higgs portal and an unified model for dark energy and dark matter
O. Bertolami, R. Rosenfeld
We examine a scenario where the Higgs boson is coupled to an additional singlet scalar field which we identify with a quintessence field. We show that this results in an unified pi…
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…
Spontaneous Symmetry Breaking in the Bulk as a Localization Mechanism of Fields on the Brane
Orfeu Bertolami, Carla Carvalho
We consider real and complex scalar fields non-minimally coupled to gravity in the bulk spacetime and study their impact on the brane upon acquiring a non-vanishing vacuum expectat…
The Abell Cluster A586 and the Detection of the Equivalence Principle
O. Bertolami, F. Gil Pedro, M. Le Delliou
We discuss the current bounds on the Equivalence Principle, in particular from structure formation and, reexamine in this context, the recent claim on the evidence of the interacti…
Dark Energy-Dark Matter Interaction and putative violation of the Equivalence Principle from the Abell Cluster A586
O. Bertolami, F. Gil Pedro, M. Le Delliou
We show that the Abell Cluster A586 exhibits evidence of the interaction between dark matter and dark energy and argue that this interaction implies a violation of the Equivalence…
A mission to test the Pioneer anomaly: estimating the main systematic effects
O. Bertolami, J. Paramos
We estimate the main systematic effects relevant in a mission to test and characterize the Pioneer anomaly through the flight formation concept, by launching probing spheres from a…
Lorentz symmetry from Lorentz violation in the bulk
Orfeu Bertolami, Carla Carvalho
We consider the mechanism of spontaneous symmetry breaking of a bulk vector field to study signatures of bulk dimensions invisible to the standard model confined to the brane. By a…