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Rapid simulation rescaling from standard to modified gravity models.

Mead, A. and Peacock, J. A. and Lombriser, L. and Li, B. (2015) 'Rapid simulation rescaling from standard to modified gravity models.', Monthly notices of the Royal Astronomical Society., 452 (4). pp. 4203-4221.


We develop and test an algorithm to rescale a simulated dark-matter particle distribution or halo catalogue from a standard gravity model to that of a modified gravity model. This method is based on that of Angulo & White but with some additional ingredients to account for (i) scale-dependent growth of linear density perturbations and (ii) screening mechanisms that are generic features of viable modified gravity models. We attempt to keep the method as general as possible, so that it may plausibly be applied to a wide range of modified theories, although tests against simulations are restricted to a subclass of f (R) models at this stage. We show that rescaling allows the power spectrum of matter to be reproduced at the ∼3 per cent level in both real and redshift space up to k = 0.1h Mpc−1 if we change the box size and alter the particle displacement field; this limit can be extended to k = 1h Mpc−1 if we additionally alter halo internal structure. We simultaneously develop an algorithm that can be applied directly to a halo catalogue, in which case the halo mass function and clustering can be reproduced at the ∼5 per cent level. Finally, we investigate the clustering of halo particle distributions, generated from rescaled halo catalogues, and find that a similar accuracy can be reached.

Item Type:Article
Keywords:Cosmology: theory, Dark energy, Large-scale structure of Universe.
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:02 July 2015
Date deposited:03 September 2015
Date of first online publication:October 2015
Date first made open access:No date available

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