On Sunday, April 21, 2019 at 5:54:33 PM UTC-6, Brent wrote: > > > > On 4/21/2019 2:20 AM, [email protected] <javascript:> wrote: > > > > On Saturday, April 20, 2019 at 9:51:13 PM UTC-6, Brent wrote: >> >> >> >> On 4/20/2019 2:14 PM, [email protected] wrote: >> >> The following (long!) video can also help (well, it did help me) >>> >>> https://www.youtube.com/watch?v=foRPKAKZWx8 >>> >>> >>> Bruno >>> >> >> *I've been viewing this video. I don't see how he established that the >> metric tensor is a correction for curved spacetime. AG * >> >> >> The metric tensor is the quantified embodiment of curved spacetime. But >> How else would you define curvature, if not with the metric? >> >> Brent >> > > *At 49:42 he defines the metric tensor. It has a Kronecker delta as the > leading term. So all cross terms will be zero in its matrix representation. > * > > > But then he says that in a curved space g_mn must be something else, that > does have cross terms. I don't find his presentation very enlightening. > He ends up wit ds^2 = g_m_n dx^r dx^s He doesn't even have the indices > match as in Einstein's summation forumula. > > Bren >
Thanks. I'm going on to Susskind's lectures on GR. AG > > *Listen; this is pure mathematics. If what he calls the metric tensor is > the general correction for curved spacetime, it can be proven > mathematically, strictly by mathematics. What I see is a hand-waving > argument at best! Ball in your court. 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] <javascript:>. > To post to this group, send email to [email protected] > <javascript:>. > Visit this group at https://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/d/optout. > > > -- 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.
