World function and time transfer: general post-Minkowskian expansions

Details World function and time transfer: general post-Minkowskian expansions World function and time transfer: general post-Minkowskian expansions

2004-03-23

arxiv.org/abs/gr-qc/0403094v2

Class.Quant.Grav. 21 (2004) 4463-4484

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Introduction is rewritten ; 2 references are added. 22 pages, no figure

Scientific paper

10.1088/0264-9381/21/18/012

In suitably chosen domains of space-time, the world function may be a powerful tool for modelling the deflection of light and the time/frequency transfer. In this paper we work out a recursive procedure for expanding the world function into a perturbative series of ascending powers of the Newtonian gravitational constant G. We show rigorously that each perturbation term is given by a line integral taken along the unperturbed geodesic between two points. Once the world function is known, it becomes possible to determine the time transfer functions giving the propagation time of a photon between its emission and its reception. We establish that the direction of a light ray as measured in the 3-space relative to a given observer can be derived from these time transfer functions, even if the metric is not stationary. We show how to deduce these functions up to any given order in G from the perturbative expansion of the world function. To illustrate the method, we carry out the calculation of the world function and of the time transfer function outside a static, spherically symmetric body up to the order G^2, the metric containing three arbitrary parameters.

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