44 citations · 150 across the 10 of their papers we have counts for
10 papers
On the Hamilton-Jacobi approach to inflation beyond slow roll
Danilo Artigas, Emmanuel Frion, Tays Miranda +2
The Hamilton-Jacobi approach is a powerful tool to describe super-Hubble dynamics during cosmological inflation in a non-linear way. A key assumption of this framework is to neglec…
Bayesian analysis of a Unified Dark Matter model with transition: can it alleviate the tension?
Emmanuel Frion, David Camarena, Leonardo Giani +4
We consider cosmological models in which Dark Matter (DM) and Dark Energy (DE) are described by a single component, dubbed Unified Dark Matter (UDM) models, in which the DE-like pa…
Primordial black holes from a curvaton scenario with strongly non-Gaussian perturbations
Andrew D. Gow, Tays Miranda, Sami Nurmi
We investigate the production of primordial black holes (PBHs) in a mixed inflaton-curvaton scenario with a quadratic curvaton potential, assuming the curvaton is in de Sitter equi…
Black Hole Shadow Drift and Photon Ring Frequency Drift
Emmanuel Frion, Leonardo Giani, Tays Miranda
The apparent angular size of the shadow of a black hole in an expanding Universe is redshift-dependent. Since cosmological redshifts change with time - known as the redshift drift…
Stochastic collapse
Tays Miranda, Emmanuel Frion, David Wands
We investigate cosmological models described by a scalar field with an exponential potential, and apply the stochastic formalism, which allows us to study how quantum field fluctua…
Neutron star masses in -gravity
Fulvio Sbisà, Pedro O. Baqui, Tays Miranda +2
We address the issue of the existence of inequivalent definitions of gravitational mass in -gravity. We present several definitions of gravitational mass, and discuss the fo…
Cosmology and Newtonian limit in a model of gravity with nonlocally interacting metrics
Leonardo Giani, Tays Miranda, Oliver F. Piattella
We investigate the features of the cosmological expansion history described by a recent model of gravity characterised by two nonlocally interacting metrics. We perform a detailed…
Generic slow-roll and non-gaussianity parameters in theories
Tays Miranda, Celia Escamilla-Rivera, Oliver F. Piattella +1
In this paper we establish \textit{formulae} for the inflationary slow-roll parameters , and as functions of the Ricci scalar for theories of gravity. As exam…
Reconstructing a theory from the -Attractors
T. Miranda, J. C. Fabris, O. F. Piattella
We show an analogy at high curvature between a theory and the -Attractors. We calculate the expressions of the parameters , and as func…
An exponential correction to Starobinsky's inflationary model
Júlio C. Fabris, Tays Miranda, Oliver F. Piattella
We analyse theories of gravity from a dynamical system perspective, showing how the correction in Starobinsky's model plays a crucial role from the viewpoint of the in…