Department of Physics and Computer Science
In this paper we examine the recently introduced Dvali-Gabadadze-Porrati (DGP) gravity model. We use the space time metric in which the local gravitation source dominates the metric over the contributions from the cosmological flow. Anticipating ideal possible solar system effects we derive expressions for the signal time delays in the vicinity of the sun, and for various angles of the signal approach. We use the corresponding numerical value for the parameter r0 to be equal to 5 Mpc, and from that we calculate that the time contribution due to DGP correction to the metric is proportional to b3/2 / c2r0. In the vicinity of the Sun and with θ in the range -π/3 ≤ θ ≤ -π/3, Δt is equal to 0.0001233 ps. A time signal delay extremely small to measure by today’s technology could be probably measurable in the future years to come, by various future experiments.
Haranas, I., Ragos, O. & Gkigkitzis, I. Radar Signal Delay in the Dvali-Gabadadze-Porrati Gravity in the Vicinity of the Sun. Astrophys Space Sci (2012) 342: 281. DOI: 10.1007/s10509-012-1165-8