On Saturday, March 10, 2018 at 10:09:45 PM UTC-5, Brent wrote: > > > > On 3/10/2018 5:04 PM, [email protected] <javascript:> wrote: > > > > On Sunday, March 4, 2018 at 11:35:24 PM UTC-5, [email protected] wrote: >> >> I don't think so. I think its equations of motion mix time and space, so >> if time increases, spatial position must change. That is, the assumption >> that time increases, produces changes in spatial position. CMIIAW. AG >> > > Here's a related question; if you assume a 4d spacetime manifold, how does > one imagine the shortest path between two points, aka a geodesic path, > using the Lorentzian metric? AG > > > In the Lorentz metric a geodesic is the longest path between two time-like > events. > > Brent >
Right; we've discussed this in the past. But if that's true, why choose motion along a geodesic in spacetime for a model of gravity if it's the LONGEST path between two time-like events. Wasn't Einstein motivated by the fact that a geodesic along a sphere using the Euclidean metric for path length, is the SHORTEST distance between two points on a sphere? AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
