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Effective dark matter power spectra in f(R) gravity.

He, J. and Li, B. and Hawken, A. J. (2015) 'Effective dark matter power spectra in f(R) gravity.', Physical review D., 92 (10). p. 103508.


Using N-body simulations, we measure the power spectrum of the effective dark matter density field, which is defined through the modified Poisson equation in f(R) cosmologies. We find that, when compared to the conventional dark matter power spectrum, the effective power spectrum deviates more significantly from the ΛCDM model. For models with fR0=−10−4, the deviation can exceed 150%, while the deviation of the conventional matter power spectrum is less than 50%. Even for models with fR0=−10−6, for which the conventional matter power spectrum is very close to the ΛCDM prediction, the effective power spectrum shows sizeable deviations. Our results indicate that traditional analyses based on the dark matter density field may seriously underestimate the impact of f(R) gravity on galaxy clustering. We therefore suggest the use of the effective density field in such studies. In addition, based on our findings, we also discuss several possible methods of making use of the differences between the conventional and effective dark matter power spectra in f(R) gravity to discriminate the theory from the ΛCDM model.

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Publisher statement:Reprinted with permission from the American Physical Society: Physical Review D 92, 103508 © 2015 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:No date available
Date deposited:12 November 2015
Date of first online publication:November 2015
Date first made open access:No date available

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