期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 475, 期 3, 页码 3262-3272出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx3288
关键词
methods: numerical; dark energy; large-scale structure of Universe
资金
- Research Council of Norway (Programme for Space Research)
- European Research Council [646702]
- UK STFC grant [ST/N000668/1, ST/L00075X/1]
- 1000 Young Talents programme in China
- Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences [XDB09000000]
- ERC Advanced Investigator grant COSMIWAY [GA 267291]
- ICG
- SEPNet
- University of Portsmouth
- Science and Technology Facilities Council [ST/P000541/1, ST/L00075X/1] Funding Source: researchfish
- STFC [ST/P000541/1, ST/N000668/1, ST/J005428/1, ST/L00075X/1] Funding Source: UKRI
The Vainshtein mechanism, present in many models of gravity, is very effective at screening dark matter haloes such that the fifth force is negligible and general relativity is recovered within their Vainshtein radii. Vainshtein screening is independent of halo mass and environment, in contrast to e.g. chameleon screening, making it difficult to test. However, our previous studies have found that the dark matter particles in filaments, walls, and voids are not screened by the Vainshtein mechanism. We therefore investigate whether cosmic voids, identified as local density minima using a watershed technique, can be used to test models of gravity that exhibit Vainshtein screening. We measure density, velocity, and screening profiles of stacked voids in cosmological N-body simulations using both dark matter particles and dark matter haloes as tracers of the density field. We find that the voids are completely unscreened, and the tangential velocity and velocity dispersion profiles of stacked voids show a clear deviation from A cold dark matter at all radii. Voids have the potential to provide a powerful test of gravity on cosmological scales.
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