Paper (*cross-listing*): gr-qc/0511038
Date: Tue, 8 Nov 2005 08:13:17 GMT (17kb)

Title: Mach's Principle and a Variable Speed of Light

Authors: Alexander Unzicker

Comments: 10 pages LaTeX, no figures
\\
Mach's principle, according to which the origin of gravitational interaction
depends on the presence of all the masses in the universe, was expressed in a
quantitative form by Sciama (1953). Since this idea suggests a variable speed
of light (VSL), it is shown here that the arising variability of c is in
agreement with all GR tests regarding time and length scales which are subject
to variation as well. Moreover, VSL opens the possibility to write the total
energy of a particle as E=mc^2; this necessarily leads to the proportionality
of inertial and gravitating mass, the equivalence principle. Furthermore, a
formula for c depending on the mass distribution is given that reproduces
Newtons law of gravitation. This mass distribution allows to calculate a
slightly variable term that corresponds to the `constant' G. The present
proposal may also supply an alternative explanation to the flatness problem and
the horizon problem in cosmology.

\\ ( http://arXiv.org/abs/gr-qc/0511038 , 17kb)