Nonlinear perturbation theory extension of the Boltzmann code CLASS
By A. Chudaykin, Mikhail Ivanov, O. Philcox, M. Simonovi'c. Physical Review D, 2020
142 citations recorded by the source corpus.
We present a new open-source code that calculates one-loop power auto- and cross-power spectra for matter fields and biased tracers in real and redshift space. These spectra incorporate all ingredients required for a direct application to data: non-linear bias, redshift-space distortions, infra-red resummation, counterterms, and the Alcock-Paczynski effect. Our code is based on the Boltzmann solver CLASS and inherits its advantage: user friendliness, ease of modification, high speed, and simple interface with other software. We present detailed descriptions of the theoretical model, the code structure, approximations, and accuracy tests. A typical end-to-end run for one cosmology takes $\sim 0.3$ seconds, which is sufficient for Markov Chain Monte Carlo parameter extraction. As an example, we apply the code to data from the Baryon Oscillation Spectroscopic Survey (BOSS) and infer cosmological parameters from the shape of the galaxy power spectrum.
Subfields: Astronomy and Astrophysics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/3e2f0b0035b164d177a4d1df60a14e6cafc84814
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Citations in the corpus
- BOSS DR12 full-shape cosmology: ΛCDM constraints from the large-scale galaxy power spectrum and bispectrum monopole (2021, methodology): “To model the window-free power spectrum and bispectrum, we utilize the EFTofLSS, as implemented in the Boltzmann code class-pt [81] (see also [82, 83]).”
- Redshift-space distortions in Lagrangian perturbation theory (2020, background): “In Fourier space, while RSD in EPT can be straightforwardly implemented [30–35], LPT has posed a number of technical difficulties that have only recently been overcome [22].”
- Constraining early dark energy with large-scale structure (2020, methodology): “Chudaykin et al. (2020) [82] claimed that the photometric LSS data does not rule out the EDE model if the ` > 1000 region of the Planck power spectra are discarded and replaced with the SPTPol measurements [83].”