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The experimental status of Special and General Relativity
Orfeu Bertolami, Jorge Páramos
In this contribution we assess the current experimental status of Special and General Relativity. Particular emphasis is put on putative extensions of these theories and on how the…
The Hamiltonian formalism for scalar fields coupled to gravity in a cosmological background
Alex E. Bernardini, O. Bertolami
A novel routine to investigate the scalar fields in a cosmological context is discussed in the framework of the Hamiltonian formalism. Starting from the Einstein-Hilbert action cou…
The Contribution of Thermal Effects to the Acceleration of the Deep-Space Pioneer Spacecraft
Orfeu Bertolami, Frederico Francisco, Jorge Páramos +1
A method for the computation of the radiative momentum transfer in the Pioneer 10 & 11 spacecraft due to the diffusive and specular components of reflection is presented. The metho…
Non-linearities in the quantum multiverse
Orfeu Bertolami, Victor Herdeiro
It has been recently proposed that the multiverse of eternal inflation and the many-worlds interpretation of quantum mechanics can be identified, yielding a new view on the measure…
Interacting universes and the cosmological constant
A. Alonso-Serrano, C. Bastos, O. Bertolami +1
We study some collective phenomena that may happen in a multiverse scenario. First, it is posed an interaction scheme between universes whose evolution is dominated by a cosmologic…
Noncommutative Graphene
C. Bastos, O. Bertolami, N. Dias +1
We consider a noncommutative description of graphene. This description consists of a Dirac equation for massless Dirac fermions plus noncommutative corrections, which are treated i…
Violation of the Robertson-Schrödinger uncertainty principle and non-commutative quantum mechanics
Catarina Bastos, Orfeu Bertolami, Nuno Costa Dias +1
We show that a possible violation of the Robertson-Schrödinger uncertainty principle may signal the existence of a deformation of the Heisenberg-Weyl algebra. More precisely, we pr…
Two-scalar-field model for the interaction of dark energy and dark matter
Orfeu Bertolami, Pedro Carrilho, Jorge Páramos
In this paper, we study the effects of an interaction between dark matter and dark energy through a two scalar field model with a potential , where i…
Traversable Wormholes and Time Machines in non-minimally coupled curvature-matter theories
Orfeu Bertolami, Ricardo Zambujal Ferreira
We obtain traversable wormhole and time machine solutions of the field equations of an alternative of gravity with non-minimally curvature-matter coupling. Our solutions exhibit a…
Noncanonical Phase-Space Noncommutative Black Holes
Catarina Bastos, Orfeu Bertolami, Nuno Dias +1
In this contribution we present a noncanonical phase-space noncommutative (NC) extension of a Kantowski Sachs (KS) cosmological model to describe the interior of a Schwarzschild bl…