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  hi class background evolution, initial conditions and approximation schemes

Bellini, E., Sawicki, I., & Zumalacárregui, M. (2020). hi class background evolution, initial conditions and approximation schemes. Journal of Cosmology and Astroparticle Physics, 2020(2): 008. doi:10.1088/1475-7516/2020/02/008.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-62FF-D Version Permalink: http://hdl.handle.net/21.11116/0000-0006-6300-A
Genre: Journal Article

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 Creators:
Bellini, Emilio, Author
Sawicki, Ignacy, Author
Zumalacárregui , Miguel1, Author
Affiliations:
1AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, ou_24008              

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Free keywords: Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,General Relativity and Quantum Cosmology, gr-qc,High Energy Physics - Phenomenology, hep-ph,High Energy Physics - Theory, hep-th
 Abstract: Cosmological datasets have great potential to elucidate the nature of dark energy and test gravity on the largest scales available to observation. Theoretical predictions can be computed with hi_class (www.hiclass-code.net), an accurate, fast and flexible code for linear cosmology, incorporating a wide range of dark energy theories and modifications to general relativity. We introduce three new functionalities into hi_class: (1) Support for models based on covariant Lagrangians, including a constraint-preserving integration scheme for the background evolution and a series of worked-out examples: Galileon, nKGB, quintessence (monomial, tracker) and Brans-Dicke. (2) Consistent initial conditions for the scalar-field perturbations in the deep radiation era, identifying the conditions under which modified-gravity isocurvature perturbations may grow faster than adiabatic modes leading to a loss of predictivity. (3) An automated quasistatic approximation scheme allowing order-of-magnitude improvement in computing performance without sacrificing accuracy for wide classes of models. These enhancements bring the treatment of dark energy and modified gravity models to the level of detail comparable to software tools restricted to standard $\Lambda$CDM cosmologies. The hi_class code is publicly available (https://github.com/miguelzuma/hi_class_public), ready to explore current data and prepare for next-generation experiments.

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 Dates: 2019-09-042020-02-112020
 Publication Status: Published in print
 Pages: 35 pages + appendices, 11 figures. Updated discussions. Code available on https://github.com/miguelzuma/hi_class_public
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 Identifiers: arXiv: 1909.01828
DOI: 10.1088/1475-7516/2020/02/008
URI: http://arxiv.org/abs/1909.01828
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Title: Journal of Cosmology and Astroparticle Physics
Source Genre: Journal
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Pages: - Volume / Issue: 2020 (2) Sequence Number: 008 Start / End Page: - Identifier: -