Thread: Alternative theories being tested by Gravity probe B
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Old Apr15-07, 07:52 AM                  #150
sylas
 
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Originally Posted by CarlB View Post
Even though the results are preliminary, some theories appear to have been eliminated. Anyone care to write up a synopsis?
Anything that did not give about 6.6 for the geodetic precession is falsified. We can ignore the frame-dragging predictions as so far not able to be tested.

Here is Garth's list.

Originally Posted by Garth View Post
  1. Einstein's General Relativity(GR)
  2. Brans-Dicke theory (BD)
  3. Barber's Self Creation Cosmology (SCC),
  4. Moffat's Nonsymmetric Gravitational Theory (NGT),
  5. Hai-Long Zhao's Mass Variance SR Theory (MVSR),
  6. Stanley Robertson's Newtonian Gravity Theory (NG),
  7. Junhao & Xiang's Flat Space-Time Theory (FST).
  8. R. L. Collin's Mass-Metric Relativity (MMR) and
  9. F. Henry-Couannier's Dark Gravity Theory (DG).
  10. Alexander and Yunes' prediction for the Chern-Simons gravity theory (CS).
  11. Kris Krogh's Wave Gravity Theory (WG)
  12. Hongya Liu & J. M. Overduin prediction of the Kaluza-Klein gravity theory (KK).

The predictions are:

A. GPB Geodetic precession (North-South)
  1. GR = 6.6144 arcsec/yr.
  2. BD = LaTeX Code: (3\\omega + 4)/(3\\omega + 6) 6.6144 arcsec/yr. where LaTeX Code: \\omega >6.
  3. SCC = 4.4096 arcsec/yr.
  4. NGT = 6.6144 - a small LaTeX Code: \\sigma correction arcsec/yr.
  5. MVSR = 0.0 arcsec/yr.
  6. NG = 6.6144 arcsec/yr.
  7. FST = 4.4096 arcsec/yr.
  8. MMR = -6.56124 arcsec/yr.
  9. DG = 6.6144 arcsec/yr.
  10. CS = 6.6144 arcsec/yr.
  11. WG = 6.6144 arcsec/yr.
  12. KK = (1 + b/6 - 3b2 + ...) 6.6144 arcsec/yr. where 0 < b < 0.07.
Based on this we have models 3, 5, 7 and 8 as falsified.
The paramaterized models 2, 4 and 12 simply have a new constraint on the free parameter.

The remaining models are:
  • GR (1)
  • Parameterized models, which are the same as GR in the limit. 2,4,10,12: BD, NGT, CS, KK.
  • Models with frame dragging at 25% of what GR expects. 6: NG
  • Models with no frame-dragging. 9,11: DG, WG.

Cheers -- Sylas
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