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Feb 10, 2018 at 22:00 comment added Deane Yang I was assuming the connection is the Levi-Civita connection which is torsion free. I don’t know happens if there’s torsion. My argument probably does not work in that case.
Feb 10, 2018 at 21:55 comment added Aegon If the Ricci is a scalar multiple of the metric, does this imply that we also need torsion-free space? Since torsion is responsible for the anti-symmetric part of the connection, it would seem to me that is an additional requirement. Just confused about how torsion enters your calculation and if it would change anything in particular.
Feb 5, 2018 at 6:34 comment added Aegon Thank you again, that helps! I think I understand from your calculation that the same should hold true even for curved space-time, although the example was done for d=3 curved space. Is this correct? Thank you again, I appreciate your help with this.
Feb 4, 2018 at 21:56 comment added Deane Yang It's also explained here: projecteuclid.org/euclid.dmj/1077303336
Feb 4, 2018 at 21:55 comment added Deane Yang Here's an explanation: en.wikipedia.org/wiki/Ricci_decomposition
Feb 4, 2018 at 21:30 comment added Aegon Thank you for that answer! Do you know of a good reference which shows the decomposition of the Reimann tensor as you've written it? I tried to show it using just the symmetries of the tensor but failed.
Feb 4, 2018 at 21:09 history bounty ended Aegon
Feb 3, 2018 at 6:35 vote accept Aegon
Feb 3, 2018 at 0:55 history answered Deane Yang CC BY-SA 3.0