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Article #14858Re: PIONEER ANOMALY AND COSMIC DECREASE OF GRAVITY
From: Craig Markwardt
Date: Sun, 27 Apr 2008 01:35
Date: Sun, 27 Apr 2008 01:35
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Louis_N@edu.herlufsholm.dk writes:
> COSMIC DECREASE OF GRAVITY. THE MODIFIED HUBBLE-LAW.
> In the following considerations about a modified Hubble-law where the
> Hubble-function H(T) is determined by a decreasing gravitational
> constant G according to the relation:
>
> (1) H(T) = - (dG/dT)*(1/G) = (1/3)*(1/T)
>
> In equation (1) (dG/dT) is the time derivative of the variable
> decreasing gravitational constant G and T is the actual age of the
> Universe.
The actual measured limit to the time variation of "G" is
|(dG/dt)/G| < 9 x 10^{-13} (ref. Williams Turyshev & Boggs 2004).
Thus, your equation 1 cannot be correct, for reasonable ages of
the universe.
CM
References
J.G. Williams, S.G. Turyshev, D.H. Boggs, PRL. 93, 261101 (2004)
gr-qc/0411113.
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