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Toyokazu Sekiguchi
순수물리이론 연구단
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Cosmological constraint on the light gravitino mass from CMB lensing and cosmic shear

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Title
Cosmological constraint on the light gravitino mass from CMB lensing and cosmic shear
Author(s)
Ken Osato; Toyokazu Sekiguchi; Masato Shirasaki; Ayuki Kamada; Naoki Yoshida
Publication Date
2016-06
Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.2016, no.6, pp.004 -
Publisher
IOP PUBLISHING LTD
Abstract
Light gravitinos of mass O(10) eV are of particular interest in cosmology,offering various baryogenesis scenarios without suffering from the cosmological gravitino problem. The gravitino may contribute considerably to the total matter content of the Universe and affect structure formation from early to present epochs. After the gravitinos decouple from other particles in the early Universe, they free-stream and consequently sup-press density fluctuations of (sub-)galactic length scales. Observations of structure at the relevant length-scales can be used to infer or constrain the mass and the abundance of light gravitinos. We derive constraints on the light gravitino mass using the data of cosmic mi-crowave background (CMB) lensing from Planck and of cosmic shear from the Canada France Hawaii Lensing Survey survey, combined with analyses of the primary CMB anisotropies and the signature of baryon acoustic oscillations in galaxy distributions. The obtained constraint on the gravitino mass ism3/2<4.7 eV (95 % C.L.), which is substantially tighter than the previous constraint from clustering analysis of Ly-αforests. (c) 2016 IOP Publishing Ltd and Sissa Medialab srl
URI
https://pr.ibs.re.kr/handle/8788114/3295
ISSN
1475-7516
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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