On 4/24/2019 4:11 PM, agrayson2...@gmail.com wrote:
On Wednesday, April 24, 2019 at 3:34:28 PM UTC-6, Brent wrote:
On 4/21/2019 7:35 PM, agrays...@gmail.com <javascript:> wrote:
On Sunday, April 21, 2019 at 8:07:28 PM UTC-6, Brent wrote:
On 4/21/2019 6:31 PM, agrays...@gmail.com wrote:
*Here's something odd. At 9:45 in Susskind's Lecture 2 on
GR, he says the metric tensor is a Kronecker delta function.
But I could swear that the diagonal of -1,1,1,1 represents
flat space in SR. AG??*
What's odd about that??? Flat space is just special case of
curved space in which the curvature is zero.
Brent
*Sure, but he seems to be saying that the Kronecker delta is the
metric tensor for curved space. Isn't that how you interpret his
comment?*
No.?? After he goes thru the derivation with delta function in it,
then he says it's different for a curve?? space.
Brent
*I just reviewed it again. That's not my reading. In any event, it's
not clear what he means, and using Bruno's suggestion, t' --> it,??
doesn't really help either since you end up with the Lorentz metric
which is far from Euclidean intuition for demonstrating deviations
from flatness. *
It was NOT demonstrating deviation from flatness.?? I don't know what the
guy was intending to demonstrate but he started with assuming flatness,
got a metric, and then remarked that it's different for curve space.?? So
what's your problem??? Read
arXiv:1608.05752v1 [physics.hist-ph] 19 Aug 2016
and stop fussing about some video.
Brent
*Further, there are transformations that keep spacetime flat with
NON-zero off diagonal elements, such as a simple rotation. AG *
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