Dilatonic effects on a falling test mass in scalar-tensor theory

Abstract

Effects of a 4d dilaton field on a falling test mass are examined from the Einstein frame perspective of scalar-tensor theory. Results are obtained for the centripetal acceleration of particles in circular orbits, and the radial acceleration for particles with pure radial motion. These results are applied to the specific case of nonrelativistic motion in the weak field approximation of Brans-Dicke theory, employing the exact Xanthopoulos-Zannias solutions. For a given parameter range, the results obtained from Brans-Dicke theory are qualitatively dramatically different from those of general relativity. Comments are made concerning a comparison with the general relativistic results in the limit of an infinite Brans-Dicke parameter.

13 pages, no figs. To appear in Gen. Rel. Grav

References in corpus (6)

• The (pseudo)issue of the conformal frame revisited
• Conformal Transformations with Multiple Scalar Fields
• Circular motion of neutral test particles in Reissner-Nordström spacetime
• PPN Parameter $\gamma$ and Solar System Constraints of Massive Brans-Dicke Theories
• Gravity coupled to a scalar field in extra dimensions
• Radion clouds around evaporating black holes

Cited by in corpus (3)

• Post-Newtonian parameters and cosmological constant of screened modified gravity
• Effects of a modified Reissner-Nordström spacetime
• Homogeneous Cosmological Models in Weyl's Geometrical Scalar-Tensor Theory