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Modified gravity spins up galactic halos.

Lee, J. and Zhao, G. and Li, B. and Koyama, K. (2013) 'Modified gravity spins up galactic halos.', Astrophysical journal., 763 (1). p. 28.

Abstract

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.

Item Type:Article
Keywords:Cosmology: theory, Large-scale structure of Universe, Methods: statistical.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1088/0004-637X/763/1/28
Publisher statement:© 2013. The American Astronomical Society. All rights reserved. Printed in the U.S.A
Date accepted:No date available
Date deposited:02 May 2014
Date of first online publication:January 2013
Date first made open access:No date available

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