Galactically inertial space probes for the direct measurement of the metric expansion of the universe

Details Galactically inertial space probes for the direct measurement of the metric expansion of the universe Galactically inertial space probes for the direct measurement of the metric expansion of the universe

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jphcs.283a2007c&link_type=abstract

Journal of Physics: Conference Series, Volume 283, Issue 1, pp. 012007 (2011).

Physics

Scientific paper

Astrometric data from the future GAIA and OBSS missions will allow a more precise calculation of the local galactic circular speed, and better measurements of galactic movements relative to the CMB will be obtained by post-WMAP missions (ie Planck). Contemporary development of high specific impulse electric propulsion systems (ie VASIMIR) will enable the development of space probes able to properly compensate the galactic circular speed as well as the resulting attraction to the centre of our galaxy. The probes would appear immobile to an ideal observer fixed at the centre of the galaxy, in contrast of every other galactic object, which would appear moving according to their local galactic circular speed and their proper motions. Arranging at least three of these galactically static probes in an extended formation and measuring reciprocal distances of the probes over time with large angle laser ranges could allow a direct measurement of the metric expansion of the universe. Free-drifting laser-ranged targets released by the spacecrafts could also be used to measure and compensate solar system's induced local perturbations. For further reducing local effects and increase the accuracy of the results, the distance between the probes should be maximized and the location of the probes should be as far as possible from the Sun and any massive object (ie Jupiter, Saturn). Gravitational waves could also induce random errors but data from GW observatories like the planned LISA could be used to correct them.

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