Testing general relativity at cosmological scales: Implementation and parameter correlations

Dossett, Jason; Ishak, Mustapha; Moldenhauer, Jacob

doi:10.1103/physrevd.84.123001

Cited by 96 publications

(113 citation statements)

References 103 publications

(165 reference statements)

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“…We modify the code by referring to ISiTGR [59], so that a power spectrum can be directly calculated from the individual transfer function. In the absence of magnification bias, the gISW cross correlation is written as…”

Section: B Constraint Methods and Datamentioning

confidence: 99%

Cosmological constraints on a decomposed Chaplygin gas

et al. 2013

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Any unified dark matter cosmology can be decomposed into dark matter interacting with vacuum energy, without introducing any additional degrees of freedom. We present observational constraints on an interacting vacuum plus dark energy corresponding to a generalised Chaplygin gas cosmology. We consider two distinct models for the interaction leading to either a barotropic equation of state or dark matter that follows geodesics, corresponding to a rest-frame sound speed equal to the adiabatic sound speed or zero sound speed, respectively. For the barotropic model, the most stringent constraint on α comes from the combination of CMB+SNIa+LSS(m) gives α < 1.44 × 10 −5 at the 95% confidence level, which indicates that the barotropic model must be extremely close to the ΛCDM cosmology. For the case where the dark matter follows geodesics, perturbations have zero sound speed, and CMB+SNIa+gISW then gives the much weaker constraint −0.1522 < α < 0.2556 at the 95% confidence level.

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Section: B Constraint Methods and Datamentioning

confidence: 99%

Cosmological constraints on a decomposed Chaplygin gas

et al. 2013

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“…Ho et al 2008). For our analysis we use the measurement of C gT l presented in Ho et al (2008), and the likelihood code described in Dossett, Ishak & Moldenhauer (2011). This likelihood code expands on that presented in Ho et al (2008) by including the effects of modified gravitational field equations.…”

Section: Temperature-galaxy Cross-correlationmentioning

confidence: 99%

“…To calculate the relevant observables (to be discussed in the next section) we use camb and CosmoMC. The modified field equations (Eq 7) are incorporated into camb using the publicly available code ISITGR (Dossett, Ishak & Moldenhauer 2011), and the exact equations implemented in camb are given by Dossett, Ishak & Moldenhauer (2011). Note the only significant difference between the equations employed in camb and Eq (7) is that the latter are written within the synchronous gauge (Ma & Bertschinger 1995).…”

Section: Introductionmentioning

confidence: 99%

Searching for modified gravity: scale and redshift dependent constraints from galaxy peculiar velocities

Johnson

Blake

Dossett

et al. 2016

Mon. Not. R. Astron. Soc.

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We present measurements of both scale-and time-dependent deviations from the standard gravitational field equations. These late-time modifications are introduced separately for relativistic and non-relativistic particles, by way of the parameters G matter (k, z) and G light (k, z) using two bins in both scale and time, with transition wavenumber 0.01 Mpc −1 and redshift 1. We emphasize the use of two dynamical probes to constrain this set of parameters, galaxy power spectrum multipoles and the direct peculiar velocity power spectrum, which probe fluctuations on different scales. The multipole measurements are derived from the WiggleZ and BOSS Data Release 11 CMASS galaxy redshift surveys and the velocity power spectrum is measured from the velocity sub-sample of the 6-degree Field Galaxy Survey. We combine with additional cosmological probes including baryon acoustic oscillations, Type Ia SNe, the cosmic microwave background (CMB), lensing of the CMB, and the temperaturegalaxy cross-correlation. Using a Markov Chain Monte Carlo likelihood analysis, we find the inferred best-fit parameter values of G matter (k, z) and G light (k, z) to be consistent with the standard model at the 95% confidence level. Furthermore, accounting for the Alcock-Paczynski effect, we perform joint fits for the expansion history and growth index gamma; we measure γ = 0.665 ± 0.0669 (68% C.L) for a fixed expansion history, and γ = 0.73 +0.08 −0.10 (68% C.L) when the expansion history is allowed to deviate from ΛCDM. With a fixed expansion history the inferred value is consistent with GR at the 95% C.L; alternatively, a 2σ tension is observed when the expansion history is not fixed, this tension is worsened by the combination of growth and SNe data.

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“…Further, specific MG models can produce both scale and redshift-dependent growth that in principle distinguishes them from dark energy models, given the same expansion history. Cosmological parameter analyses to test MG theories have been performed by several authors [340,884,895,896,903,[908][909][910][911][912][913]. Specific studies to determine the cosmological impact of galileon theories and to constrain model parameters appear in [265,[914][915][916][917][918][919][920].…”

Section: Cosmological Testsmentioning

confidence: 99%

“…The authors then show how constraints on theory parameters can be obtained from measurements of the expansion history and the growth of structure using just the solution for the background evolution of the theory. On a practical note, the public Boltzman-Einstein solver CAMB has been upgraded by [991] to include MG predictions using an effective field theory approach (see also [913]). …”

Section: Model Independent Approaches To Cosmological Analysismentioning

confidence: 99%

Beyond the cosmological standard model

et al. 2015

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After a decade and a half of research motivated by the accelerating universe, theory and experiment have a reached a certain level of maturity. The development of theoretical models beyond Λ or smooth dark energy, often called modified gravity, has led to broader insights into a path forward, and a host of observational and experimental tests have been developed. In this review we present the current state of the field and describe a framework for anticipating developments in the next decade. We identify the guiding principles for rigorous and consistent modifications of the standard model, and discuss the prospects for empirical tests.We begin by reviewing recent attempts to consistently modify Einstein gravity in the infrared, focusing on the notion that additional degrees of freedom introduced by the modification must "screen" themselves from local tests of gravity. We categorize screening mechanisms into three broad classes: mechanisms which become active in regions of high Newtonian potential, those in which first derivatives of the field become important, and those for which second derivatives of the field are important. Examples of the first class, such as f (R) gravity, employ the familiar chameleon or symmetron mechanisms, whereas examples of the last class are galileon and massive gravity theories, employing the Vainshtein mechanism. In each case, we describe the theories as effective theories and discuss prospects for completion in a more fundamental theory. We describe experimental tests of each class of theories, summarizing laboratory and solar system tests and describing in some detail astrophysical and cosmological tests. Finally, we discuss prospects for future tests which will be sensitive to different signatures of new physics in the gravitational sector.The review is structured so that those parts that are more relevant to theorists vs. observers/experimentalists are clearly indicated, in the hope that this will serve as a useful reference for both audiences, as well as helping those interested in bridging the gap between them.

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Testing general relativity at cosmological scales: Implementation and parameter correlations

Cited by 96 publications

References 103 publications

Cosmological constraints on a decomposed Chaplygin gas

Cosmological constraints on a decomposed Chaplygin gas

Searching for modified gravity: scale and redshift dependent constraints from galaxy peculiar velocities

Beyond the cosmological standard model

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