EFTCAMB

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By B. Hu, M. Raveri, N. Frusciante and A. Silvestri

EFTCAMB is a patch of the public Einstein-Boltzmann solver CAMB, which implements the Effective Field Theory approach to cosmic acceleration. The code can be used to investigate the effect of different EFT operators on linear perturbations as well as to study perturbations in any specific DE/MG model that can be cast into EFT framework. To interface EFTCAMB with cosmological data sets, we equipped it with a modified version of CosmoMC, namely EFTCosmoMC, creating a bridge between the EFT parametrization of the dynamics of perturbations and observations.

Features

• EFTCAMB evolves the full set of perturbative scalar equations without relying on any quasi-static approximation;

• EFTCAMB evolves the tensor perturbative equations;

• Complete set of perturbative equations which includes all the second order EFT operators, consistently implemented to account for the inclusion of more than one second order operator per time;

• Background expansion histories: several Dark Energy equation of state parametrizations, including phantom-divide crossings ones (see flowchart below);

• Pure EFT procedure: It allows to study the underlying DE/MG theory through a parametrization of the EFT functions,

built-in: selected models for EFT functions (see flowchart below) and the possibility to choose their functional form arbitrarily according to any ansatz the user wants to investigate, including the opportunity to set all/some of them to zero.

built-in: Pure EFT Horndeski, restricts pure EFT models to the Horndeski class of theories with four free functions.

• Mapping EFT procedure: It allows implementation of specific single field DE/MG models (see flowchart below),

Designer mapping EFT: Built-in: designer f(R), Minimally coupled quintessence;

Full EFT Mapping: Low-energy Horava gravity.

• EFT Alternative Parametrizations: It allows implementation of alternative model independent parametrizations in terms of EFT functions (see flowchart below),

built-in: ReParametrization of the Horndeski class of theories (RPH) in terms of four functions of time which correspond to specific physical properties of the scalar dof.

• Stability check of perturbations in the dark sector to ensure that the underlying gravitational theory is acceptable,

built-in: physical conditions: positive non-minimal coupling function, the avoidence of ghost and gradient instabilities;

built-in: Mathematical (or classical) conditions: well defined π -field equation, no fast exponential growing of the π -field perturbations, well defined tensor perturbations equation.

• EFTCAMB is compatible with massive neutrinos;

• EFTCAMB sources: LSS number counts, LSS weak lensing and all CMB cross-correlation functions in DE/MG models;

• EFTCosmoMC: exploration of the parameter space performing comparison with several cosmological data sets,

built-in: CMB data.

• EFTCAMB/EFTCosmoMC is compatible with the Planck 2015 likelihood PLC 2.0,

• NEW full scalability in model space constant up to O(1000) models,

• NEW automatically built code documentation,

Numerical Notes

We also provide a user-friendly numerical notes that contain all the details and formulas of the implementation

• EFTCAMB/EFTCosmoMC: Numerical Notes v3.0

Bin Hu, Marco Raveri, Noemi Frusciante, Alessandra Silvestri, arXiv:1405.3590 [astro-ph.CO]

References

If you use the EFTCAMB/EFTCosmoMC package, please refer the original CAMB/ CosmoMC papers and ours:

• Effective Field Theory of Cosmic Acceleration: an implementation in CAMB

Bin Hu, Marco Raveri, Noemi Frusciante, Alessandra Silvestri, arXiv:1312.5742 [astro-ph.CO] Phys.Rev. D89 (2014) 103530

• Effective Field Theory of Cosmic Acceleration: constraining dark energy with CMB data

Marco Raveri, Bin Hu, Noemi Frusciante, Alessandra Silvestri, arXiv:1405.1022 [astro-ph.CO] Phys.Rev. D90 (2014) 043513

Get in touch with us

If you have questions or comments, please contact us at eftcamb@gmail.com

or at bhu@bnu.edu.cn & mraveri@sas.upenn.edu & nfrusciante@fc.ul.pt & silvestri@lorentz.leidenuniv.nl

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