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Modified gravity spins up galactic halos

Lee, J.; Zhao, G.; Li, B.; Koyama, K.

Modified gravity spins up galactic halos Thumbnail


J. Lee

G. Zhao

K. Koyama


We investigate the effect of modified gravity on the specific angular momentum of galactic halos by analyzing the halo catalogs at z = 0 from high-resolution N-body simulations for a f(R) gravity model that meets the solar-system constraint. It is shown that the galactic halos in the f(R) gravity model tend to acquire significantly higher specific angular momentum than those in the standard ΛCDM model. The largest difference in the specific angular momentum distribution between these two models occurs for the case of isolated galactic halos with mass less than 1011 h –1 M ☉, which are likely least shielded by the chameleon screening mechanism. As the specific angular momentum of galactic halos is rather insensitive to other cosmological parameters, it can in principle be an independent discriminator of modified gravity. We speculate a possibility of using the relative abundance of low surface brightness galaxies (LSBGs) as a test of general relativity given that the formation of the LSBGs occurs in fast spinning dark halos.

Journal Article Type Article
Publication Date Jan 20, 2013
Deposit Date Mar 27, 2013
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 763
Issue 1
Article Number 28
Keywords Cosmology: theory, Large-scale structure of Universe, Methods: statistical.
Public URL


Published Journal Article (377 Kb)

Copyright Statement
© 2013. The American Astronomical Society. All rights reserved. Printed in the U.S.A

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