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• W2034833392 abstract "view Abstract Citations (8) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Anisotropies of the Cosmic Background Radiation in a Reionized Universe Tuluie, Robin ; Matzner, Richard A. ; Anninos, Peter Abstract We trace the evolution of cosmic microwave background photons propagating through a model universe filled with hot dark matter and a reionized intergalactic medium (IGM). The reionization of the intergalactic medium is achieved by UV photons emitted from the decaying hot dark matter neutrinos with a mass of 29 eV and lifetime of 1.5 x 1023 s. The model universe is represented by a comoving cube of present size 529 Mpc through which we propagate photons and subject them to the Sachs-Wolfe effect and Thomson scattering off the ionized fraction of the IGM, beginning at z = 1900 just before the epoch of decoupling until the present z = 0. The simulation follows the evolving matter inhomogeneities and microwave background photons into the present nonlinear regime and yields temperature maps of the microwave sky as a comoving observer would detect. Our temperature maps display anisotropies on scales ranging from 2° to 8° with rms amplitudes ranging from ΔT/Trms = 2.8 to 3.4 × 10-5 for Ω = 1 and h = 0.55 without reionization. If we allow the neutrinos to decay and subsequently re-ionize the IGM, the level of the temperature anisotropies is reduced to ΔT/Trms = 0.8 to 1.1 × 10-5. This includes the Doppler shifts suffered by the CMB photons as they scatter off the moving ionized fraction of the IGM. If we turn off the contribution to ΔT/Trms from these Doppler shifts, the temperature anisotropies are reduced to ΔT/Trms = 0.7 to 0.8 × 10-5 for Ω = 1 and h = 0.55 in the reionized model. If, however, reionization is caused by a late and sudden energy input into the IGM, we find that some reduction in ΔT/T occurs, but not enough to make this scenario consistent with observations. Including the contribution to ΔT/Trms from Doppler shifts at the surface of last scattering, the level of anisotropies in this scenario is usually at the same level and sometimes even higher than the original primordial fluctuations. We find that reionization via the decaying neutrino hypothesis is more efficient at reducing primordial anisotropies and generates smaller Doppler shift anisotropies than a model in which the universe is reionized via a late and sudden energy input into the IGM. In the case the universe is not reionized the contribution to ΔT/Trms from Doppler shifts at decoupling is small compared to the Sachs-Wolfe effect at large angular scales. Publication: The Astrophysical Journal Pub Date: June 1995 DOI: 10.1086/175804 arXiv: arXiv:astro-ph/9403040 Bibcode: 1995ApJ...446..447T Keywords: COSMOLOGY: COSMIC MICROWAVE BACKGROUND; COSMOLOGY: DARK MATTER; COSMOLOGY: THEORY; Astrophysics E-Print: 20 pages, LaTeX, 5 figures and 2 color plates available upon request. Submitted to ApJ. Replaced with single spaced version with corrected line lengths and necessary macro full text sources arXiv | ADS |" @default.
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• W2034833392 date "1995-06-01" @default.
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• W2034833392 title "Anisotropies of the Cosmic Background Radiation in a Reionized Universe" @default.
• W2034833392 doi "https://doi.org/10.1086/175804" @default.
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