Supernova, baryon acoustic oscillations, and CMB surface distance constraints on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>f</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>G</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>higher order gravity models

Moldenhauer, Jacob; Ishak, Mustapha; Thompson, John; Easson, Damien A.

doi:10.1103/physrevd.81.063514

Cited by 13 publications

(8 citation statements)

References 107 publications

(45 reference statements)

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“…Some models have been shown to be also free from other instabilities due to superluminal propagations and fit cosmological expansion constraints De Felice and Tsujikawa ( 2009 ), Moldenhauer and Ishak ( 2009 ) and Moldenhauer et al. ( 2010 ). The action is given by where we has set in this sub-section , and are the matter and radiation Lagrangians, respectively.…”

Section: Types Of Modifications To Gr At Cosmological Scales and Corrmentioning

confidence: 89%

Testing general relativity in cosmology

2018

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We review recent developments and results in testing general relativity (GR) at cosmological scales. The subject has witnessed rapid growth during the last two decades with the aim of addressing the question of cosmic acceleration and the dark energy associated with it. However, with the advent of precision cosmology, it has also become a well-motivated endeavor by itself to test gravitational physics at cosmic scales. We overview cosmological probes of gravity, formalisms and parameterizations for testing deviations from GR at cosmological scales, selected modified gravity (MG) theories, gravitational screening mechanisms, and computer codes developed for these tests. We then provide summaries of recent cosmological constraints on MG parameters and selected MG models. We supplement these cosmological constraints with a summary of implications from the recent binary neutron star merger event. Next, we summarize some results on MG parameter forecasts with and without astrophysical systematics that will dominate the uncertainties. The review aims at providing an overall picture of the subject and an entry point to students and researchers interested in joining the field. It can also serve as a quick reference to recent results and constraints on testing gravity at cosmological scales.

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Section: Types Of Modifications To Gr At Cosmological Scales and Corrmentioning

confidence: 89%

Testing general relativity in cosmology

2018

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“…The phase space of FLRW solutions to L = f (R, Ĝ) theories, and the transition from deceleration to acceleration, has also been studied in [25,26,24]. Supernova, BAO and CMB observations have been used to constrain L = R + f ( Ĝ) theories in [907].…”

Section: General Theoriesmentioning

confidence: 99%

Modified Gravity and Cosmology

Clifton,

Ferreira,

Padilla

et al. 2011

Preprint

501

847

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In this review we present a thoroughly comprehensive survey of recent work on modified theories of gravity and their cosmological consequences. Amongst other things, we cover General Relativity, Scalar-Tensor, Einstein-Aether, and Bimetric theories, as well as TeVeS, f (R), general higher-order theories, Hořava-Lifschitz gravity, Galileons, Ghost Condensates, and models of extra dimensions including Kaluza-Klein, Randall-Sundrum, DGP, and higher co-dimension braneworlds. We also review attempts to construct a Parameterised Post-Friedmannian formalism, that can be used to constrain deviations from General Relativity in cosmology, and that is suitable for comparison with data on the largest scales. These subjects have been intensively studied over the past decade, largely motivated by rapid progress in the field of observational cosmology that now allows, for the first time, precision tests of fundamental physics on the scale of the observable Universe. The purpose of this review is to provide a reference tool for researchers and students in cosmology and gravitational physics, as well as a self-contained, comprehensive and up-to-date introduction to the subject as a whole.

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“…Since negative norm states are often called "ghosts" in quantum theory, higher derivative theories are often called "ghost-like". 2 Recently, there has been a resurgence of interest in higher derivative theories, particularly within attempts to modify gravity [4][5][6][7][8][9][10][11][12][13][14][15]. It is well known that higher derivative theories of the f (R) form are secretly healthy as they are degenerate -a technically important distinction which means that the highest derivative term cannot be written as a function of canonical variables.…”

Section: Contentsmentioning

confidence: 99%