Primordial hydrogen recombination dynamics with recoil upon scattering in the Ly-α line

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Primordial hydrogen recombination dynamics with recoil upon scattering in the Ly-α line. / Grachev, S. I.; Dubrovich, V. K.

In: Astronomy Letters, Vol. 34, No. 7, 07.2008, p. 439-444.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{0c001c88d4654e32b2f6ed10051c644b,

title = "Primordial hydrogen recombination dynamics with recoil upon scattering in the Ly-α line",

abstract = "We show that including the recoil upon scattering in the Ly-α line can lead to a noticeable acceleration of the primordial hydrogen recombination. Thus, for example, for the ΛCDM model, the decrease in the degree of ionization exceeds 1% at redshifts z = 800-1050, reaching ≈1.3% at z = 900. The corresponding corrections to the calculated cosmic microwave background power spectra reach 1.1% and 1.7% for TT and EE spectra, respectively. The radiative transfer in these calculations was treated in the quasi-stationary approximation.We have also obtained numerical solutions (in the diffusion approximation) to the nonstationary problem of radiative transfer in the Ly-α line for a partial frequency redistribution with recoil. We trace the evolution of the local line profile and the relative number of uncompensated transitions from the 2p state to the 1s state. We show that including the nonstationarity of the Ly-α line radiative transfer can lead to an additional acceleration of the primordial hydrogen recombination.",

keywords = "Cosmic microwave background, Cosmology, Early Universe, Primordial hydrogen, Recombination epoch",

author = "Grachev, {S. I.} and Dubrovich, {V. K.}",

note = "Funding Information: We wish to thank V.G. Romanyuk for the calculations of the CMB power spectra. We are grateful to the referee for the remarks aimed at improving the paper. This work was supported by the Russian Foundation for Basic Research (project nos. 05-02-16658 and 06-02-17096) and a grant from the President of Russia for Support of Leading Scientific Schools (NSh-8542.2006.2). Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2008",

month = jul,

doi = "10.1134/S1063773708070013",

language = "English",

volume = "34",

pages = "439--444",

journal = "Astronomy Letters",

issn = "1063-7737",

publisher = "МАИК {"}Наука/Интерпериодика{"}",

number = "7",

}

RIS

TY - JOUR

T1 - Primordial hydrogen recombination dynamics with recoil upon scattering in the Ly-α line

AU - Grachev, S. I.

AU - Dubrovich, V. K.

N1 - Funding Information: We wish to thank V.G. Romanyuk for the calculations of the CMB power spectra. We are grateful to the referee for the remarks aimed at improving the paper. This work was supported by the Russian Foundation for Basic Research (project nos. 05-02-16658 and 06-02-17096) and a grant from the President of Russia for Support of Leading Scientific Schools (NSh-8542.2006.2). Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2008/7

Y1 - 2008/7

N2 - We show that including the recoil upon scattering in the Ly-α line can lead to a noticeable acceleration of the primordial hydrogen recombination. Thus, for example, for the ΛCDM model, the decrease in the degree of ionization exceeds 1% at redshifts z = 800-1050, reaching ≈1.3% at z = 900. The corresponding corrections to the calculated cosmic microwave background power spectra reach 1.1% and 1.7% for TT and EE spectra, respectively. The radiative transfer in these calculations was treated in the quasi-stationary approximation.We have also obtained numerical solutions (in the diffusion approximation) to the nonstationary problem of radiative transfer in the Ly-α line for a partial frequency redistribution with recoil. We trace the evolution of the local line profile and the relative number of uncompensated transitions from the 2p state to the 1s state. We show that including the nonstationarity of the Ly-α line radiative transfer can lead to an additional acceleration of the primordial hydrogen recombination.

AB - We show that including the recoil upon scattering in the Ly-α line can lead to a noticeable acceleration of the primordial hydrogen recombination. Thus, for example, for the ΛCDM model, the decrease in the degree of ionization exceeds 1% at redshifts z = 800-1050, reaching ≈1.3% at z = 900. The corresponding corrections to the calculated cosmic microwave background power spectra reach 1.1% and 1.7% for TT and EE spectra, respectively. The radiative transfer in these calculations was treated in the quasi-stationary approximation.We have also obtained numerical solutions (in the diffusion approximation) to the nonstationary problem of radiative transfer in the Ly-α line for a partial frequency redistribution with recoil. We trace the evolution of the local line profile and the relative number of uncompensated transitions from the 2p state to the 1s state. We show that including the nonstationarity of the Ly-α line radiative transfer can lead to an additional acceleration of the primordial hydrogen recombination.

KW - Cosmic microwave background

KW - Cosmology

KW - Early Universe

KW - Primordial hydrogen

KW - Recombination epoch

UR - http://www.scopus.com/inward/record.url?scp=47849128865&partnerID=8YFLogxK

U2 - 10.1134/S1063773708070013

DO - 10.1134/S1063773708070013

M3 - Article

AN - SCOPUS:47849128865

VL - 34

SP - 439

EP - 444

JO - Astronomy Letters

JF - Astronomy Letters

SN - 1063-7737

IS - 7

ER -

ID: 74195306