21  Nitpicking General Relativity                                     Table of Contents     Previous      Next

1. Gravitons and the curvature of spacetime: It may be that the gravitons presented in sections 17,18 and 19 and General Relativity are equivalent descriptions of gravity despite the different viewpoints.  The graviton viewpoint postulates that the curvature of space-time is a two element process. First mass is always associated with gravitons and it is these gravitons that produce the force of gravity and curve space-time. General Relativity takes the view that mass directly produces the curvature of space-time which in turn produces the force of gravity. Cause and effect can get tricky. See Section 17 to see how DWT conceives of the graviton (not necessarily the standard model notion of the graviton). See Section 19 to see how the graviton provides the mechanism for the curving of space-time.

2. A disagreement on how gravity bends light:
The diagram at the left shows how an elevator accelerating upward curves a white light beam according to general relativity.
The diagram at the right shows how an elevator accelerating upward curves a white light beam according to DWT.

This difference is because DWT has the speed of light changing with wavelength. The blue light is propagating slower and therefore will be deflected by a greater amount. It is as if the acceleration of the elevator (and gravity) has caused an increase in the index of refraction of space-time. To see how the speed of light changes with wavelength see section 25.
This difference between general relativity and DWT can be tested by performing the experiment indicated by the diagrams above. The experiment could be done on the astronomical level by finding a suitable white light source that travels near a massive gravitational object and showing that the light does (or does not) break up into a spectrum of colors. The difference in speed between red light and blue light is exceedingly small and great care will be needed in setting up this experiment. Note that in
section 19 a tabletop experiment is outlined that could possibly determine the speed differences between red light and blue light.