Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-11-16
Phys.Rev.D83:043513,2011
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Version accepted by PRD. Numerical integration switches adapted to be well behaved for a wide range of cosmologies (Sec. V E).
Scientific paper
10.1103/PhysRevD.83.043513
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 1P - 1 1S line, the He I] 2 3P - 1 1S 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 ~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.
Ali-Haïmoud Yacine
Hirata Christopher M.
No associations
LandOfFree
HyRec: A fast and highly accurate primordial hydrogen and helium recombination code does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with HyRec: A fast and highly accurate primordial hydrogen and helium recombination code, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HyRec: A fast and highly accurate primordial hydrogen and helium recombination code will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-464911