Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 6, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2016/06/004
Keywords
weak gravitational lensing; dark matter theory
Funding
- Research Fellowships of the Japan Society for the Promotion of Science (JSPS)
- JST CREST
- IBS [IBS-R018-D1]
- Advanced Leading Graduate Course for Photon Science
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS-R018-D1-2016-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [16J01512] Funding Source: KAKEN
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Light gravitinos of mass less than or similar to 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 suppress 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 microwave 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 is m(3/2) < 4.7eV (95 % C.L.), which is substantially tighter than the previous constraint from clustering analysis of Ly-alpha forests.
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