On Saturday, March 10, 2018 at 10:09:45 PM UTC-5, Brent wrote: > > > > On 3/10/2018 5:04 PM, agrays...@gmail.com <javascript:> wrote: > > > > On Sunday, March 4, 2018 at 11:35:24 PM UTC-5, agrays...@gmail.com 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
