Timeline for Is GR vacuum equation unique?
Current License: CC BY-SA 2.5
5 events
| when toggle format | what | by | license | comment | |
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| Jun 18, 2015 at 15:42 | comment | added | Void | @Edward: as stated in the physics overflow import, the full list of terms is given by the Lovelock Lagrangian | |
| Mar 24, 2011 at 2:17 | vote | accept | Edward | ||
| Mar 20, 2011 at 14:55 | comment | added | Edward | Hmm... so following your suggestion, if I take $R^{abcd}R_{abcd} - 4 R^{ab}R_{ab} + R^2$ (which according to en.wikipedia.org/wiki/Generalized_Gauss%E2%80%93Bonnet_theorem is a Euler character density in 4D) and add it to the lagrangian density, it would be equivalent to adding a constant to the total action and thus not have any effect. Is that the idea? Are there only a finite number of such "Gauss-Bonnet terms" in 4D? I don't know that much about them. | |
| Mar 20, 2011 at 14:34 | history | edited | QGR | CC BY-SA 2.5 |
added 75 characters in body
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| Mar 20, 2011 at 14:17 | history | answered | QGR | CC BY-SA 2.5 |