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11 papers · 2 filters
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…
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…
Spacetime dynamics of spinning particles - exact electromagnetic analogies
L. Filipe O. Costa, José Natário, Miguel Zilhão
We compare the rigorous equations describing the motion of spinning test particles in gravitational and electromagnetic fields, and show that if the Mathisson-Pirani spin condition…
Gravito-electromagnetic analogies
L. Filipe O. Costa, José Natário
We reexamine and further develop different gravito-electromagnetic (GEM) analogies found in the literature, and clarify the connection between them. Special emphasis is placed in t…
Mathisson's helical motions demystified
L. Filipe O. Costa, José Natário, Miguel Zilhão
The motion of spinning test particles in general relativity is described by Mathisson-Papapetrou-Dixon equations, which are undetermined up to a spin supplementary condition, the l…