The effective field theory (EFT) of dark energy relies on three functions of time to describe the dynamics of background cosmology. The viability of these functions is investigated here by means of a thorough dynamical analysis. While the system is underdetermined, and one can always find a set of functions reproducing any expansion history, we...
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2014 (v1)PublicationUploaded on: May 13, 2023
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2014 (v1)Publication
We implement the effective field theory (EFT) approach to dark energy and modified gravity in the public Einstein-Boltzmann solver CAMB. The resulting code, which we dub EFTCAMB, is a powerful and versatile tool that can be used for several objectives. It can be employed to evolve the full dynamics of linear scalar perturbations of a broad...
Uploaded on: March 27, 2023 -
2015 (v1)Publication
We revisit the degeneracy between massive neutrinos and generalized theories of gravity in the framework of the effective field theory of cosmic acceleration. In particular, we consider f(R) theories and a class of nonminimally coupled models parametrized via a coupling to gravity which is linear in the scale factor. In the former case, we find...
Uploaded on: April 14, 2023 -
2014 (v1)Publication
We introduce EFTCAMB/EFTCosmoMC as publicly available patches to the commonly used camb/CosmoMC codes. We briefly describe the structure of the codes, their applicability and main features. To illustrate the use of these patches, we obtain constraints on parametrized pure effective field theory and designer f(R) models, both on ΛCDM and wCDM...
Uploaded on: April 14, 2023 -
2016 (v1)Publication
We consider Hořava gravity within the framework of the effective field theory (EFT) of dark energy and modified gravity. We work out a complete mapping of the theory into the EFT language for an action including all the operators which are relevant for linear perturbations with up to sixth order spatial derivatives. We then employ an updated...
Uploaded on: April 14, 2023 -
2018 (v1)Publication
We revisit the cosmology of covariant Galileon gravity in view of the most recent cosmological data sets, including weak lensing. As a higher derivative theory, covariant Galileon models do not have a ΛCDM limit and predict a very different structure formation pattern compared with the standard ΛCDM scenario. Previous cosmological analyses...
Uploaded on: May 13, 2023 -
2018 (v1)Publication
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 precision. We look at three general purpose codes that primarily model general scalar-tensor theories, three codes that model Jordan-Brans-Dicke (JBD) gravity, a code that...
Uploaded on: April 14, 2023 -
2021 (v1)Publication
The standard Λ Cold Dark Matter cosmological model provides a wonderful fit to current cosmological data, but a few statistically significant tensions and anomalies were found in the latest data analyses. While these anomalies could be due to the presence of systematic errors in the experiments, they could also indicate the need for new physics...
Uploaded on: April 14, 2023 -
2021 (v1)Publication
The current cosmological probes have provided a fantastic confirmation of the standard Λ Cold Dark Matter cosmological model, which has been constrained with unprecedented accuracy. However, with the increase of the experimental sensitivity, a few statistically significant tensions between different independent cosmological datasets emerged....
Uploaded on: April 14, 2023 -
2021 (v1)Publication
The standard Λ Cold Dark Matter cosmological model provides an amazing description of a wide range of astrophysical and astronomical data. However, there are a few big open questions, that make the standard model look like a first-order approximation to a more realistic scenario that still needs to be fully understood. In this Letter of...
Uploaded on: March 27, 2023 -
2021 (v1)Publication
A precise measurement of the curvature of the Universe is of prime importance for cosmology since it could not only confirm the paradigm of primordial inflation but also help in discriminating between different early-Universe scenarios. Recent observations, while broadly consistent with a spatially flat standard Λ Cold Dark Matter (ΛCDM) model,...
Uploaded on: January 31, 2024 -
2022 (v1)Publication
The standard Λ Cold Dark Matter (ΛCDM) cosmological model provides a good description of a wide range of astrophysical and cosmological data. However, there are a few big open questions that make the standard model look like an approximation to a more realistic scenario yet to be found. In this paper, we list a few important goals that need to...
Uploaded on: February 6, 2024