263 citations · 589 across the 13 of their papers we have counts for
12 papers · 1 filter
Testing Gravity on Cosmic Scales: A Case Study of Jordan-Brans-Dicke Theory
Shahab Joudaki, Pedro G. Ferreira, Nelson A. Lima +1
We provide an end-to-end exploration of a distinct modified gravitational theory in Jordan-Brans-Dicke (JBD) gravity, from an analytical and numerical description of the background…
The road ahead of Horndeski: cosmology of surviving scalar-tensor theories
Noemi Frusciante, Simone Peirone, Santiago Casas +1
In the context of the effective field theory of dark energy (EFT) we perform agnostic explorations of Horndeski gravity. We choose two parametrizations for the free EFT functions,…
Gravitational wave speed: Implications for models without a mass scale
Henrik Nersisyan, Nelson A. Lima, Luca Amendola
The recent report that the gravitational wave speed equals the light speed puts strong constraints on the anisotropic stress parameter of many modified gravity models, a quantity t…
A comparison of Einstein-Boltzmann solvers for testing General Relativity
E. Bellini, A. Barreira, N. Frusciante +24
We compare Einstein-Boltzmann solvers that include modifications to General Relativity and find that, for a wide range of models and parameters, they agree to a high level of preci…
Constraints on decaying early modified gravity from cosmological observations
Nelson A. Lima, Vanessa Smer-Barreto, Lucas Lombriser
Most of the information on our cosmos stems from either late-time observations or the imprint of early-time inhomogeneities on the cosmic microwave background. We explore to what e…
Challenges to Self-Acceleration in Modified Gravity from Gravitational Waves and Large-Scale Structure
Lucas Lombriser, Nelson A. Lima
With the advent of gravitational-wave astronomy marked by the aLIGO GW150914 and GW151226 observations, a measurement of the cosmological speed of gravity will likely soon be reali…
On the phenomenology of extended Brans-Dicke Gravity
Nelson A. Lima, Pedro G. Ferreira
We introduce a designer approach for extended Brans-Dicke gravity that allows us to obtain the evolution of the scalar field by fixing the Hubble parameter to that of a CDM mode…
Constraints on hybrid metric-Palatini models from background evolution
Nelson A. Lima, Vanessa Smer-Barreto
In this work, we introduce two models of the hybrid metric-Palatini theory of gravitation. We explore their background evolution, showing explicitly that one recovers standard Gene…
Reconstructing thawing quintessence with multiple datasets
Nelson A. Lima, Andrew R. Liddle, Martin Sahlén +1
In this work we model the quintessence potential in a Taylor series expansion, up to second order, around the present-day value of the scalar field. The field is evolved in a thawi…
Dynamics of Linear Perturbations in the hybrid metric-Palatini gravity
Nelson A. Lima
In this work we focus on the evolution of the linear perturbations in the novel hybrid metric-Palatini theory achieved by adding a function to the gravitational ac…
Linear perturbations in viable f(R) theories
Nelson A. Lima, Andrew R. Liddle
We describe the cosmological evolution predicted by three distinct theories, with emphasis on the evolution of linear perturbations. The most promising observational tools f…
Constraining Recent Oscillations in Quintessence Models with Euclid
Nelson A. Lima, P. T. P. Viana, I. Tereno
Euclid is a future space-based mission that will constrain dark energy with unprecedented accuracy. Its photometric component is optimized for Weak Lensing studies, while the spect…