Post-Newtonian parametersγandβof scalar-tensor gravity with a general potential
| Autor: | Erik Randla, Laur Järv, Manuel Hohmann, Piret Kuusk |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Physical Review D. 88 |
| ISSN: | 1550-2368 1550-7998 |
| DOI: | 10.1103/physrevd.88.084054 |
| Popis: | We calculate the parametrized post-Newtonian parameters $\ensuremath{\gamma}$ and $\ensuremath{\beta}$ for scalar-tensor gravity with a generic coupling function $\ensuremath{\omega}$ and scalar potential $V$ in the Jordan conformal frame in the case of a static spherically symmetric source. Since the potential generally introduces a radial dependence to the effective gravitational constant as well as to $\ensuremath{\gamma}$ and $\ensuremath{\beta}$, we discuss the issue of defining these parametrized post-Newtonian parameters and compare our expressions with previous calculations in simpler cases. We confront our results with current observational constraints on the values of $\ensuremath{\gamma}$ and $\ensuremath{\beta}$ and thus draw restrictions on the form of the functions $\ensuremath{\omega}$ and $V$ around their asymptotic background values. |
| Databáze: | OpenAIRE |
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