Re: Query about non-symmetric energy tensors
- From: stevendaryl3016@xxxxxxxxx (Daryl McCullough)
- Date: 21 Mar 2008 14:55:43 -0700
Tom Roberts says...
Jay R. Yablon wrote:
Can someone please explain or provide some links which explain how the
physics of a non-symmetric energy tensor would be different from that of
a symmetric energy tensor.
A non-symmetric energy tensor makes precisely the same amount of sense
as a non-symmetric metric tensor. Remember that the energy tensor is
defined as the variational derivative of the (scalar) Lagrangian with
respect to the metric.
I'm not sure that I agree with that. According to Wikipedia,
http://en.wikipedia.org/wiki/Stress-energy_tensor,
asymmetry in the stress-energy tensor is to expected
if there is a nonzero spin density.
Classical General Relativity makes the assumption that the total
angular momentum in a small region of space goes to zero as the
volume of the space goes to zero, but that doesn't hold if there
are point-particles with intrinsic spin.
--
Daryl McCullough
Ithaca, NY
.
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