HyRec: A fast and highly accurate primordial hydrogen and helium recombination code
By Y. Ali-Haimoud, C. Hirata. 2010
189 citations recorded by the source corpus.
We present a state-of-the-art primordial recombination code, HYREC, including all the physical effects that have been shown to significantly affect recombination. The computation of helium recombination includes simple analytic treatments of hydrogen continuum opacity in the He I 2{sup 1}P{sup o}-1{sup 1}S line, the He I]2{sup 3}P{sup o}-1{sup 1}S line, and treats feedback between these lines within the on-the-spot approximation. Hydrogen recombination is computed using the effective multilevel atom method, virtually accounting for an infinite number of excited states. We account for two-photon transitions from 2s and higher levels as well as frequency diffusion in Lyman-{alpha} with a full radiative transfer calculation. We present a new method to evolve the radiation field simultaneously with the level populations and the free electron fraction. These computations are sped up by taking advantage of the particular sparseness pattern of the equations describing the radiative transfer. The computation time for a full recombination history is {approx}2 seconds. This makes our code well suited for inclusion in Monte Carlo Markov chains for cosmological parameter estimation from upcoming high-precision cosmic microwave background anisotropy measurements.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/cf8bf7401d066db78a4811a7aee97f0e0f3e67ca
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In Astronomy and Astrophysics
- D. Baumann
- S. Vagnozzi
- V. Poulin
- Guido D'Amico
- E. Pajer
- Julien Lesgourgues
- Juan García-Bellido
- E. di Valentino
Citations in the corpus
- Exploring cosmic origins with CORE: Inflation (2016, background): “For future data analyses, the differences with the detailed cosmological recombination codes CosmoRec [176] and HyReci [177] can be avoided but have shown to be small (≈ 0.3σ for nS) even at the level of precision that could be reached with CORE [9].”
- Cosmological constraints on exotic injection of electromagnetic energy (2016, methodology): “For instance, a species constituting 1% of the total DM 2http://class-code.net 3In reality Recfast contains equations that are modified with fudge factors calibrated on more accurate code such as CosmoRec [13, 14] and HyRec [15].”