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Toyokazu Sekiguchi
순수물리이론 연구단
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21 cm angular power spectrum from minihalos as a probe of primordial spectral runnings

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Title
21 cm angular power spectrum from minihalos as a probe of primordial spectral runnings
Author(s)
Toyokazu Sekiguchi; Tomo Takahashi; Hiroyuki Tashiro; Shuichiro Yokoyama
Publication Date
2018-02
Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v., no.2, pp.053 -
Publisher
IOP PUBLISHING LTD
Abstract
Measurements of 21 cm line fluctuations from minihalos have been discussed as a powerful probe of a wide range of cosmological models. However, previous studies have taken into account only the pixel variance, where contributions from different scales are integrated. In order to sort out information from different scales, we formulate the angular power spectrum of 21 cm line fluctuations from minihalos at different redshifts, which can enhance the constraining power enormously. By adopting this formalism, we investigate expected constraints on parameters characterizing the primordial power spectrum, particularly focusing on the spectral index ns and its runnings αs and βs. We show that future observations of 21 cm line fluctuations from minihalos, in combination with cosmic microwave background, can potentially probe these runnings as αs ∼ (10-3) and βs ∼ (10-4). Its implications to the test of inflationary models are also discussed. © 2018 IOP Publishing Ltd and Sissa Medialab
URI
https://pr.ibs.re.kr/handle/8788114/4692
ISSN
1475-7516
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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