Cosmological constraints on post-Newtonian parameters in effectively massless scalar-tensor theories of gravity

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dc.contributor.authorRossi, Massimo
dc.contributor.authorBallardini, Mario
dc.contributor.authorBraglia, Matteo
dc.date.accessioned2022-11-09T12:22:17Z
dc.date.available2022-11-09T12:22:17Z
dc.date.issued2019
dc.description.abstractWe study the cosmological constraints on the variation of Newton’s constant and on post-Newtonian parameters for simple models of the scalar-tensor theory of gravity beyond the extended Jordan-BransDicke theory. We restrict ourselves to an effectively massless scalar field with a potential V ∝ F2, where FðσÞ ¼ N2 pl þ ξσ2 is the coupling to the Ricci scalar considered. We derive the theoretical predictions for cosmic microwave background anisotropies and matter power spectra by requiring that the effective gravitational strength at present is compatible with the one measured in a Cavendish-like experiment and by assuming an adiabatic initial condition for scalar fluctuations. When comparing these models with Planck 2015 and a compilation of baryonic acoustic oscillations data, all these models accommodate a marginalized value for H0 higher than in ΛCDM. We find no evidence for a statistically significant deviation from Einstein’s general relativity. We find ξ < 0.064 (jξj < 0.011) at 95% CL for ξ > 0 (for ξ < 0, ξ ≠ −1=6). In terms of post-Newtonian parameters, we find 0.995 < γPN < 1 and 0.99987 < βPN < 1 (0.997 < γPN < 1 and 1 < βPN < 1.000011) for ξ > 0 (for ξ < 0). For the particular case of the conformal coupling, i.e., ξ ¼ −1=6, we find constraints on the post-Newtonian parameters of similar precision to those within the Solar System.en_US
dc.identifier.citationRossi, M. et al. (2019) Cosmological constraints on post-Newtonian parameters in effectively massless scalar-tensor theories of gravity. Physical review. D. [Online] 100 (10), 1–.https://doi.org/10.1103/PhysRevD.100.103524en_US
dc.identifier.urihttps://doi.org/10.1103/PhysRevD.100.103524
dc.identifier.urihttp://hdl.handle.net/10566/8155
dc.language.isoenen_US
dc.subjectNewton’s constanten_US
dc.subjectCosmic microwaveen_US
dc.subjectCavendish experimenten_US
dc.subjectJordan-BransDicke theoryen_US
dc.titleCosmological constraints on post-Newtonian parameters in effectively massless scalar-tensor theories of gravityen_US
dc.typeArticleen_US

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