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Massive gravity wrapped in the cosmic web

Shim, J.; Lee, J.; Li, B.

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Authors

J. Shim

J. Lee



Abstract

We study how the filamentary pattern of the cosmic web changes if the true gravity deviates from general relativity (GR) on a large scale. The f(R) gravity, whose strength is controlled to satisfy the current observational constraints on the cluster scale, is adopted as our fiducial model and a large, high-resolution N-body simulation is utilized for this study. By applying the minimal spanning tree algorithm to the halo catalogs from the simulation at various epochs, we identify the main stems of the rich superclusters located in the most prominent filamentary section of the cosmic web and determine their spatial extents per member cluster to be the degree of their straightness. It is found that the f(R) gravity has the effect of significantly bending the superclusters and that the effect becomes stronger as the universe evolves. Even in the case where the deviation from GR is too small to be detectable by any other observables, the degree of the supercluster straightness exhibits a conspicuous difference between the f(R) and the GR models. Our results also imply that the supercluster straightness could be a useful discriminator of f(R) gravity from the coupled dark energy since it is shown to evolve differently between the two models. As a final conclusion, the degree of the straightness of the rich superclusters should provide a powerful cosmological test of large scale gravity.

Journal Article Type Article
Publication Date Mar 20, 2014
Deposit Date Jan 13, 2014
Publicly Available Date May 2, 2014
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 784
Issue 1
Article Number 84
DOI https://doi.org/10.1088/0004-637x/784/1/84
Keywords Large-scale structure of universe.
Public URL https://durham-repository.worktribe.com/output/1442580

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Copyright Statement
© 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A.






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