Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/30789
Titolo: | Cosmological constraints on post-Newtonian parameters in effectively massless scalar-tensor theories of gravity | Autori: | Rossi, Massimo Ballardini, Mario BRAGLIA, MATTEO FINELLI, FABIO PAOLETTI, DANIELA Starobinsky, Alexei A. Umiltà, Caterina |
Data pubblicazione: | 2019 | Rivista: | PHYSICAL REVIEW D | Numero: | 100 | Fascicolo: | 10 | Da pagina:: | 103524 | Abstract: | We 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-Brans-Dicke theory. We restrict ourselves to an effectively massless scalar field with a potential V ∝F<SUP>2</SUP>, where F (σ )=N<SUB>pl</SUB><SUP>2</SUP>+ξ σ<SUP>2</SUP> 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 H<SUB>0</SUB> higher than in Λ CDM . We find no evidence for a statistically significant deviation from Einstein's general relativity. We find ξ <0.064 (|ξ |<0.011 ) at 95% CL for ξ >0 (for ξ <0 , ξ ≠-1 /6 ). In terms of post-Newtonian parameters, we find 0.995 <γ<SUB>PN</SUB><1 and 0.99987 <β<SUB>PN</SUB><1 (0.997 <γ<SUB>PN</SUB><1 and 1 <β<SUB>PN</SUB><1.000011 ) for ξ >0 (for ξ <0 ). For the particular case of the conformal coupling, i.e., ξ =-1 /6 , we find constraints on the post-Newtonian parameters of similar precision to those within the Solar System. | URI: | http://hdl.handle.net/20.500.12386/30789 | URL: | https://journals.aps.org/prd/abstract/10.1103/PhysRevD.100.103524 | ISSN: | 2470-0010 | DOI: | 10.1103/PhysRevD.100.103524 | Bibcode ADS: | 2019PhRvD.100j3524R | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
1906.10218.pdf | postprint | 1.36 MB | Adobe PDF | Visualizza/apri |
PhysRevD.100.103524.pdf | Pdf editoriale | 1.94 MB | Adobe PDF | Visualizza/apri |
Page view(s)
44
controllato il 19-apr-2024
Download(s)
22
controllato il 19-apr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.