hi_class background evolution, initial conditions and approximation schemes
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. Finally, 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.
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); European Research Council (ERC)
- OSTI Identifier:
- 1603623
- Grant/Contract Number:
- AC02-05CH11231; 693024
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2020; Journal Issue: 02; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Bellini, Emilio, Sawicki, Ignacy, and Zumalacárregui, Miguel. hi_class background evolution, initial conditions and approximation schemes. United States: N. p., 2020.
Web. doi:10.1088/1475-7516/2020/02/008.
Bellini, Emilio, Sawicki, Ignacy, & Zumalacárregui, Miguel. hi_class background evolution, initial conditions and approximation schemes. United States. https://doi.org/10.1088/1475-7516/2020/02/008
Bellini, Emilio, Sawicki, Ignacy, and Zumalacárregui, Miguel. Mon .
"hi_class background evolution, initial conditions and approximation schemes". United States. https://doi.org/10.1088/1475-7516/2020/02/008. https://www.osti.gov/servlets/purl/1603623.
@article{osti_1603623,
title = {hi_class background evolution, initial conditions and approximation schemes},
author = {Bellini, Emilio and Sawicki, Ignacy and Zumalacárregui, Miguel},
abstractNote = {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. Finally, 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.},
doi = {10.1088/1475-7516/2020/02/008},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 02,
volume = 2020,
place = {United States},
year = {Mon Feb 10 00:00:00 EST 2020},
month = {Mon Feb 10 00:00:00 EST 2020}
}
Web of Science
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DBI Galileons in the Einstein Frame: Local Gravity and Cosmology
text, January 2012
- Zumalacarregui, Miguel; Koivisto, Tomi S.; Mota, David F.
- arXiv
CosmoSIS: modular cosmological parameter estimation
text, January 2014
- Zuntz, Joe; Paterno, Marc; Jennings, Elise
- arXiv
Shaken, not stirred: kinetic mixing in scalar-tensor theories of gravity
text, January 2015
- Bettoni, Dario; Zumalacárregui, Miguel
- arXiv
Initial conditions for cosmological N-body simulations of the scalar sector of theories of Newtonian, Relativistic and Modified Gravity
text, January 2015
- Valkenburg, Wessel; Hu, Bin
- arXiv
An extensive investigation of the Generalised Dark Matter model
text, January 2016
- Kopp, Michael; Skordis, Constantinos; Thomas, Dan B.
- arXiv
hi_class: Horndeski in the Cosmic Linear Anisotropy Solving System
text, January 2016
- Zumalacarregui, Miguel; Bellini, Emilio; Sawicki, Ignacy
- arXiv
Speed of Gravitational Waves and the Fate of Scalar-Tensor Gravity
text, January 2016
- Bettoni, Dario; Ezquiaga, Jose María; Hinterbichler, Kurt
- arXiv
KiDS-450: Testing extensions to the standard cosmological model
text, January 2016
- Joudaki, Shahab; Mead, Alexander; Blake, Chris
- arXiv
Testing (modified) gravity with 3D and tomographic cosmic shear
text, January 2018
- Mancini, A. Spurio; Reischke, R.; Pettorino, V.
- arXiv
Dark Energy in light of Multi-Messenger Gravitational-Wave astronomy
text, January 2018
- Ezquiaga, Jose María; Zumalacárregui, Miguel
- arXiv
Rapid Calculation of Theoretical CMB Angular Power Spectra
text, January 2002
- Kaplinghat, Manoj; Knox, Lloyd; Skordis, Constantinos
- arXiv