On 3/9/2018 5:28 PM, agrayson2...@gmail.com wrote:
On Friday, March 9, 2018 at 12:51:29 PM UTC-5, Lawrence Crowell wrote:
On Friday, March 9, 2018 at 9:44:30 AM UTC-6, agrays...@gmail.com
On Friday, March 9, 2018 at 12:10:13 AM UTC-5, Brent wrote:
On 3/8/2018 8:40 PM, agrays...@gmail.com wrote:
*This I find troubling. We have two fundamental physical
phenomenon, gravity and EM, and they seem to have no
intrinsic relationship between each other. AG
They have more relationship than they did when Maxwell
discovered EM. It was purely a field on a fixed
background. So you've been troubled since 1862.
Under GR the EM field is a source of gravity and hence
warps spacetime; and warped spacetime deflects EM waves.
*Good perspective on the situation. OTOH, for Newton movement
is caused by an attractive force, whereas for Einstein it's
caused by the advancement of time. So, IMO, the mystery of
movement in a gravity field persists. AG*
I am not exactly sure why you are stuck on the idea that the
advance of time causes motion.
*Because in the absence of a force causing non-geodesic motion, the
increase in time results in a change in spatial position since in the
equations of motion, spatial coordinates are not independent
variables; they depend on time IIUC. AG*
You seem to have a confused concept of "cause". To say time causes
motion is like saying being different places at different times causes
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