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Ann. Geophys., 26, 727-730, 2008
www.ann-geophys.net/26/727/2008/
© European Geosciences Union 2008
Testing the local spacetime dynamics by heliospheric radiocommunication methods
H.-J. Fahr and M. Siewert
Argelander-Institut für Astronomie, Abt. Astrophysik, Auf dem Hügel 71, 53121 Bonn, Germany
Abstract. According to general relativistic theories, cosmological spacetime is dynamic.
This prediction is in excellent agreement with the huge majority of
astronomical observations on large cosmic scales, especially the observations
of cosmological redshifts of distant galaxies. However, on scales of
heliospheric distances, verifications of general relativistic
effects are based on Schwarzschild metric tests or kinetical corrections, such as
the perihelion motion of Mercury, photon deflection at
the Sun and gravitational photon redshifts in central gravity fields. As we
will show in this paper, there is, however, a chance to detect new
cosmologically relevant features on heliospheric scales by careful study of
photon propagations in the local spacetime metrics, based on red- or
blueshifts as a clear, but up to now overlooked, signature of the
local spacetime dynamics. Thus, we propose the challenging
possibility of carrying out experiments of cosmological relevance by simply
using high-precision radio tracking of heliospheric spaceprobes,
as already practised in cases like Pioneer-10/11, Galileo and Ulysses.
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