Towards a complete treatment of the cosmological recombination problem
169 citations recorded by the source corpus.
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 cosmological hydrogen recombination, accounting for ns-1s and nd-ls Raman events and two-photon transitions from levels with n ≥ 2. The recombination problem for hydrogen is described using an effective 400-shell multilevel approach to which we subsequently add all important recombination corrections discussed in the literature thus far. We explicitly solve the radiative transfer equation of the Lyman-series photon field to obtain the required modifications to the rate equations of the resolved levels. In agreement with earlier computations, we find that 2s-1s Raman scattering leads to a delay in recombination by ΔN e /N e ~ 0.9 per cent at z ~ 920. Two-photon decay and the Raman scattering from higher levels (n > 3) result in small additional modifications, and precise results can be obtained when including their effect for the first three to five shells. This work is a major step towards a new cosmological recombination code (COSMOREC) that supersedes the physical model included in RECFAST, and which, owing to its short run time, can be used in the analysis of future cosmic microwave background data from the PLANCK Surveyor.
Subfields: Astronomy and Astrophysics, Instrumentation
View Paper: https://www.semanticscholar.org/paper/f701b239953dda7f487e696844c7528522322641
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In Astronomy and Astrophysics
- D. Baumann
- S. Vagnozzi
- V. Poulin
- Julien Lesgourgues
- Guido D'Amico
- E. Pajer
- Juan García-Bellido
- E. di Valentino
In Instrumentation
Citations in the corpus
- CMB at 2 × 2 order: the dissipation of primordial acoustic waves and the observable part of the associated energy release (2012, methodology): “We utilized the stiff ordinary equation (ODE) solver implemented for CosmoRec (Chluba & Thomas 2011).”
- 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].”
- The Atacama Cosmology Telescope: cosmological parameters from three seasons of data (2013, unknown): “For the parameter analysis, we use the publicly available CosmoMC code, which includes version 1.5 of the Recfast code (Seager et al. 1999, 2000; Wong et al. 2008; Switzer & Hirata 2008; Ali-Ha¨ımoud & Hirata 2011; Chluba & Thomas 2011).”
- The evolution of CMB spectral distortions in the early Universe (2011, methodology): “…distribution is obtained using the partial differential equation (PDE) solver developed in connection with the cosmological recombination problem (Chluba & Thomas 2011), which allows us to setup a non-uniform grid spacing using a second order semi-implicit scheme in both time and spatial…”
- 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].”