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8 papers · 2 filters
Superradiant instabilities in astrophysical systems
Helvi Witek, Vitor Cardoso, Akihiro Ishibashi +1
Light bosonic degrees of freedom have become a serious candidate for dark matter. The evolution of these fields around curved spacetimes is poorly understood but is expected to dis…
Surface singularities in Eddington-inspired Born-Infeld gravity
Paolo Pani, Thomas P. Sotiriou
Eddington-inspired Born-Infeld gravity was recently proposed as an alternative to general relativity that offers a resolution of spacetime singularities. The theory differs from Ei…
Tidal effects around higher-dimensional black holes
Richard Brito, Vitor Cardoso, Paolo Pani
In four-dimensional spacetime, moons around black holes generate low-amplitude tides, and the energy extracted from the hole's rotation is always smaller than the gravitational rad…
Gravitational collapse in non-minimally coupled gravity: finite density singularities and the breaking of the no-hair theorem
J. Páramos, C. Bastos
In this work we study the dynamics of gravitational collapse of a homogeneous dust sphere in a model exhibiting a linear non-minimal coupling between matter and curvature. The evol…
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…
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…