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Modified gravity with massive neutrinos as a testable alternative cosmological model.

Barreira, A. and Li, B. and Baugh, C. and Pascoli, S. (2014) 'Modified gravity with massive neutrinos as a testable alternative cosmological model.', Physical review D., 90 (2). 023528.


We show that, in the presence of massive neutrinos, the Galileon gravity model provides a very good fit to the current cosmic microwave background (CMB) temperature, CMB lensing and baryonic acoustic oscillation data. This model, which we dub νGalileon, when assuming its stable attractor background solution, contains the same set of free parameters as lambda cold dark matter (ΛCDM), although it leads to different expansion dynamics and nontrivial gravitational interactions. The data provide compelling evidence (≳6σ) for nonzero neutrino masses, with Σmν≳0.4  eV at the 2σ level. Upcoming precision terrestrial measurements of the absolute neutrino mass scale therefore have the potential to test this model. We show that CMB lensing measurements at multipoles l≲40 will be able to discriminate between the νGalileon and ΛCDM models. Unlike ΛCDM, the νGalileon model is consistent with local determinations of the Hubble parameter. The presence of massive neutrinos lowers the value of σ8 substantially, despite of the enhanced gravitational strength on large scales. Unlike ΛCDM, the νGalileon model predicts a negative ISW effect, which is difficult to reconcile with current observational limits.

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Publisher statement:Reprinted with permission from the American Physical Society: Alexandre Barreira, Baojiu Li, Carlton M. Baugh, and Silvia Pascoli. Modified gravity with massive neutrinos as a testable alternative cosmological model. Physical Review D, 90, 2, 023528 © 2014 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:15 August 2014
Date of first online publication:July 2014
Date first made open access:No date available

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