Towards a fully consistent parametrization of modified gravity

Tessa Baker, Pedro G. Ferreira, Constantinos Skordis, and Joe Zuntz
Phys. Rev. D 84, 124018 – Published 8 December 2011

Abstract

There is a distinct possibility that current and future cosmological data can be used to constrain Einstein’s theory of gravity on the very largest scales. To be able to do this in a model-independent way, it makes sense to work with a general parameterization of modified gravity. Such an approach would be analogous to the Parameterized Post-Newtonian (PPN) approach which is used on the scale of the Solar System. A few such parameterizations have been proposed and preliminary constraints have been obtained. We show that the majority of such parameterizations are only exactly applicable in the quasistatic regime. On larger scales they fail to encapsulate the full behavior of typical models currently under consideration. We suggest that it may be possible to capture the additions to the ‘Parameterized Post-Friedmann’ (PPF) formalism by treating them akin to fluid perturbations.

  • Received 23 July 2011

DOI:https://doi.org/10.1103/PhysRevD.84.124018

© 2011 American Physical Society

Authors & Affiliations

Tessa Baker*

  • Astrophysics, University of Oxford, DWB, Keble Road, Oxford, OX1 3RH, UK

Pedro G. Ferreira

  • Astrophysics and Oxford Martin School, University of Oxford, DWB, Keble Road, Oxford, OX1 3RH, UK

Constantinos Skordis

  • School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD,UK

Joe Zuntz§

  • Department of Physics & Astronomy, University College London, WC1E 6BT, UK

  • *tessa.baker@astro.ox.ac.uk
  • p.ferreira1@physics.ox.ac.uk
  • skordis@nottingham.ac.uk
  • §jaz@astro.ox.ac.uk

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Issue

Vol. 84, Iss. 12 — 15 December 2011

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