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We know the gravity well. Then, Is the gravitational constant always constant? Is the present gravitational constant same as that of 10 million years ago ?
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Is the gravitational constant always constant?
time dependency
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#2
7 November 2011 - 05:10 PM
swansont 
Shaken, not Stirred
Currently G is changing no faster than about a part in 10^12 per year
http://arxiv.org/pdf/gr-qc/0411113 (ArXiv copy of a PRL)
I don't know if you can determine G from remote measurements (which would be old measurements by virtue of d =ct), because we assume the value to deduce the masses. The papers I can find all measure G-dot.
http://arxiv.org/pdf/gr-qc/0411113 (ArXiv copy of a PRL)
I don't know if you can determine G from remote measurements (which would be old measurements by virtue of d =ct), because we assume the value to deduce the masses. The papers I can find all measure G-dot.
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#4
8 December 2011 - 03:40 PM
swansont
Shaken, not Stirred
Oldman, on 8 December 2011 - 03:15 PM, said:
Why G is changing --albeit very slowy? Can general relativity live with changing G?
Nobody has claimed that it is (in the papers I found). The results are consistent with zero and place an upper bound on how fast it could be changing, which is a function of the experimental accuracy and precision. A claim that G was changing would require that zero be statistically excluded.
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Stop failing the Turing test!
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