Cosmological Tests of Gravity: A Future Perspective

Martinelli, Matteo; Casas, S.

doi:10.3390/universe7120506

Cited by 8 publications

(5 citation statements)

References 178 publications

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“…The past decade and a half also witnessed the emergence and maturing of the field of cosmological tests of GR, which led to identifying broad classes of potentially interesting modified gravity (MG) theories (see [4][5][6][7][8] for reviews) and developing phenomenological frameworks for non-model-specific tests [9][10][11][12][13][14][15][16][17][18] along with their numerical implementations [19][20][21][22][23]. Testing gravity and the physics of DE is one of the primary science goals of the ongoing and upcoming surveys, such as DESI [24], Euclid [25] and Vera Rubin Observatory [26], which will take these tests to qualitatively higher levels [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Principal reconstructed modes of dark energy and gravity

Raveri

Pogosian

Martinelli

et al. 2023

J. Cosmol. Astropart. Phys.

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Recently, in [1], we presented the first combined non-parametric reconstruction of the three time-dependent functions that capture departures from the standard cosmological model, ΛCDM, in the expansion history and gravitational effects on matter and light from the currently available combination of the background and large scale structure data. The reconstruction was performed with and without a theory-informed prior, built on the general Horndeski class of scalar-tensor theories, that correlates the three functions. In this work, we perform a decomposition of the prior and posterior covariances of the three functions to determine the structure of the modes that are constrained by the data relative to the Horndeski prior. We find that the combination of all data can constrain 15 combined eigenmodes of the three functions with respect to the prior. We examine and interpret their features in view of the well-known tensions between datasets within the ΛCDM model. We also assess the bias introduced by the simplistic parameterizations commonly used in the literature for constraining deviations from GR on cosmological scales.

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Section: Introductionmentioning

confidence: 99%

Principal reconstructed modes of dark energy and gravity

Raveri

Pogosian

Martinelli

et al. 2023

J. Cosmol. Astropart. Phys.

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“…As things stand, General Relativity is the currently accepted theory of gravity, valid in a low-energy, macroscopic scale. It has been tested over and over by astronomical observations and experiments and has shown to be consistent every single time [50]. However, there are certain situations in which it appears to have some flaws.…”

Section: Horndeski's Theorymentioning

confidence: 99%

Multisymplectic formalism for cubic horndeski theories

Gaset

2023

Phys. Scr.

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We present the covariant multisymplectic formalism for the so-called cubic Horndeski theories and discuss the geometrical and physical interpretation of the constraints that arise in the uniﬁed Lagrangian-Hamiltonian approach. We analyse in more detail the covariant Hamiltonian formalism of these theories and we show that there are particular conditions that must be satisﬁed for the Poincar´e-Cartan form of the Lagrangian to project onto J1π. From this result, we study when a formulation using only multimomenta is possible. We further discuss the implications of the general case, in which the projection onto J1π conditions are not met.

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“…Work in producing frameworks for testing gravity in cosmology has therefore often tended to focus on creating new independent frameworks (see e.g. [5,8,9]). Such approaches usually rely on cosmological perturbation theory, and must therefore be extrapolated into the non-linear regime.…”

Section: Introductionmentioning

confidence: 99%

Scale-dependent gravitational couplings in Parameterised Post-Newtonian Cosmology

Thomas

Clifton²,

Anton³

2023

J. Cosmol. Astropart. Phys.

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Parameterised Post-Newtonian Cosmology (PPNC) is a theory-agnostic framework for testing gravity in cosmology, which connects gravitational physics on small and large scales in the Universe. It is a direct extension of the Parameterised Post-Newtonian (PPN) approach to testing gravity in isolated astrophysical systems, and therefore allows constraints on gravity from vastly different physical regimes to be compared and combined. We investigate the application of this framework to a class of example scalar-tensor theories of gravity in order to verify theoretical predictions, and to investigate for the first time the scale-dependence of the gravitational couplings that appear within its perturbation equations. In doing so, we evaluate the performance of some simple interpolating functions in the transition region between small and large cosmological scales, as well as the uncertainties that using such functions would introduce into the calculation of observables. We find that all theoretical predictions of the PPNC framework are verified to high accuracy in the relevant regimes, and that simple interpolating functions perform well (but not perfectly) between these regimes. This study is an important step towards being able to use the PPNC framework to analyse cosmological datasets, and to thereby test if/how the gravitational interaction has changed as the Universe has evolved.

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Cosmological Tests of Gravity: A Future Perspective

Cited by 8 publications

References 178 publications

Principal reconstructed modes of dark energy and gravity

Principal reconstructed modes of dark energy and gravity

Multisymplectic formalism for cubic horndeski theories

Scale-dependent gravitational couplings in Parameterised Post-Newtonian Cosmology

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