Würzburg 2018 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 17: Experimental tests II
GR 17.1: Vortrag
Freitag, 23. März 2018, 09:00–09:20, Phys-SR-SE1
The Gravitational Field of a Laser Beam of Gaussian Profile — •Fabienne Schneiter1, Dennis Rätzel2, and Daniel Braun1 — 1Institut für Theoretische Physik, Eberhard-Karls-Universität Tübingen, 72076 Tübingen, Germany — 2Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria
We investigate the gravitational properties of light for the case of a laser beam with Gaussian profile. Such Gaussian beams are approximate solutions of the Helmholtz equation valid under the condition of small beam divergence. We start from an expansion of the vector potential in orders of the divergence angle and derive the perturbation of the spacetime metric induced by the beam and the corresponding spacetime curvature to the same order. Calculating the geodesics, we analyze the motion of massive test particles at rest as well as the motion of test rays of light. The results are compared to well-known cases such as the infinitely thin beam of light first investigated in the seminal paper by Tolman et al.