21 cm angular power spectrum from minihalos as a probe of primordial spectral runnings
نویسندگان
چکیده
منابع مشابه
Primordial non-Gaussianity from the 21 cm power spectrum during the epoch of reionization.
Primordial non-Gaussianity is a crucial test of inflationary cosmology. We consider the impact of non-Gaussianity on the ionization power spectrum from 21 cm emission at the epoch of reionization. We focus on the power spectrum on large scales at redshifts of 7 to 8 and explore the expected constraint on the local non-Gaussianity parameter f(NL) for current and next-generation 21 cm experiments...
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Asantha Cooray, Chao Li, and Alessandro Melchiorri Center for Cosmology, Department of Physics and Astronomy, University of California, 4129 Frederick Reines Hall, Irvine, California 92697, USA Theoretical Astrophysics, California Institute of Technology, Mail Code 103-33 Pasadena, California 91125, USA Dipartimento di Fisica ‘‘G. Marconi’’ and INFN, sezione di Roma, Universita’ di Roma ‘‘La Sa...
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Observations of redshifted 21cm radiation from neutral hydrogen (HI) at high redshifts is an important future probe of reionization. We consider the Multi-frequency Angular Power Spectrum (MAPS) to quantify the statistics of the HI signal as a joint function of the angular multipole l and frequency separation ∆ν. The signal at two different frequencies is expected to get decorrelated as ∆ν is i...
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Fluctuations in high-redshift cosmic 21-cm radiation provide a new window for observing unconventional effects of high-energy physics in the primordial spectrum of density perturbations. In scenarios for which the initial state prior to inflation is modified at short distances, or for which deviations from scale invariance arise during the course of inflation, the cosmic 21-cm power spectrum ca...
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We study the absorption along lines of sight toward high-z radio sources caused by the 21 cm transition of neutral hydrogen in the intergalactic medium (IGM) before reionization. Using semi-analytic methods, we compute the number density of observable features caused by both “minihalos” (bound objects that are unable to cool efficiently because of their small virial temperatures) and protogalac...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2018
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2018/02/053