Cosmological Hydrogen Recombination: influence of resonance and electron scattering
Jens Chluba,Rashid Sunyaev +1 more
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In this article, the effects of resonance and electron scattering on the escape of Lymanα photons during cosmological hydrogen recombination were investigated, and it was shown that due to the redistribution of photons over frequency hydrogen recombinations is sped up, leading to a frequency-dependent asymmetry between the emission and absorption profile.Abstract:
In this paper we consider the effects of resonance and electron scattering on the escape of Lymanα photons during cosmological hydrogen recombination. We pay particular attention to the influence of atomic recoil, Doppler boosting and Doppler broadening using a Fokker-Planck approximation of the redistribution function describing the scattering of photons on the Lymanα resonance of moving hydrogen atoms. We extend the computations of our recent paper on the influence of the 3d /3s-1s two-photon channels on the dynamics of hydrogen recombination, simultaneously including the full time-dependence of the problem, the thermodynamic corrections factor, leading to a frequency-dependent asymmetry between the emission and absorption profile, and the quantummechanical corrections related to the two-photon nature of the 3d/3s-1s emission and absorption process on the exact shape of the Lymanα emission profile. We show here that due to the redistribution of photons over frequency hydrogen recombination is sped upread more
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Towards a complete treatment of the cosmological recombination problem
Jens Chluba,Rajat M. Thomas +1 more
TL;DR: In this paper, a new approach to the cosmological recombination problem is presented, which completes our previous analysis on the effects of two-photon processes during the epoch of cosmologically hydrogen recombination, accounting for ns-1s and nd-ls Raman events and two-oton transitions from levels with n ≥ 2.
Journal ArticleDOI
Towards a complete treatment of the cosmological recombination problem
Jens Chluba,Rajat M. Thomas +1 more
TL;DR: In this paper, a new approach to the cosmological recombination problem is presented, which completes our previous analysis on the effects of two-photon processes during the epoch of cosmologically hydrogen recombination, accounting for ns-1s and nd- 1s Raman events and two-oton transitions from levels with n>=2.
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Ultrafast effective multilevel atom method for primordial hydrogen recombination
TL;DR: In this paper, the authors present a new method for solving the multilevel atom recombination problem, which splits the problem into a computationally expensive atomic physics component and an ultrafast cosmological evolution component.
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Could the cosmological recombination spectrum help us understand annihilating dark matter
TL;DR: In this paper, the authors explore the potential effects of dark matter (DM) annihilations on the cosmological recombination spectrum, and show that the results depend on the detailed branching of the deposited energy into heating, ionizations and excitations.
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Estimating the impact of recombination uncertainties on the cosmological parameter constraints from cosmic microwave background experiments
Jose Alberto Rubino-Martin,Jose Alberto Rubino-Martin,Jens Chluba,W. A. Fendt,Benjamin D. Wandelt +4 more
TL;DR: In this paper, the authors used a Monte Carlo Markov Chain analysis to sample the posterior distribution of the cosmological parameters of the Rico code, and showed that the expected biases in the CMB parameters inferred from Planck might be as large as 2.3, 1.7, 0.3 and 0.4 sigmas for nS, bh 2 and log(10 10 AS), respectively, in the minimal six parameter CDM model, if all those corrections are not taken into account.
References
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Small-scale fluctuations of relic radiation*
R. A. Sunyaev,Ya. B. Zel'dovich +1 more
TL;DR: In this paper, it is shown that an adiabatic connection exists between the density perturbations at the moment of recombination of the initial plasma and fluctuations of the observed temperature of radiation δT/T=δϱm/3ϱ m.
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A New Calculation of the Recombination Epoch
TL;DR: In this paper, an improved recombination calculation of H, He i, and He ii in the early universe is presented, which involves a line-by-line treatment of each atomic level.