Post-Newtonian parameter $\gamma$ for multiscalar-tensor gravity with a general potential
| Autor: | Piret Kuusk, Laur Järv, Manuel Hohmann, Erik Randla, Ott Vilson |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Coupling
Physics High Energy Physics - Theory 010308 nuclear & particles physics Point source 01 natural sciences General Relativity and Quantum Cosmology Neutron star High Energy Physics - Phenomenology Quadratic equation Classical mechanics 0103 physical sciences Higgs boson Newtonian fluid 010306 general physics Eigenvalues and eigenvectors Special unitary group Mathematical physics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | We compute the parametrized post-Newtonian parameter $\gamma$ in the case of a static point source for multiscalar-tensor gravity with completely general nonderivative couplings and potential in the Jordan frame. Similarly to the single massive field case $\gamma$ depends exponentially on the distance from the source and is determined by the length of a vector of non-minimal coupling in the space of scalar fields and its orientation relative to the mass eigenvectors. Using data from the Cassini tracking experiment, we estimate bounds on a general theory with two scalar fields. Our formalism can be utilized for a wide range of models, which we illustrate by applying it to nonminimally coupled Higgs SU(2) doublet, general hybrid metric-Palatini gravity, linear ($\Box^{-1}$) and quadratic ($\Box^{-2}$) nonlocal gravity. Comment: some clarifications and references added, REVTex version submitted to PRD for publication, 31 pages, 3 figures |
| Databáze: | OpenAIRE |
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