Timeline for What is the symbol of a differential operator?
Current License: CC BY-SA 2.5
7 events
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Nov 2, 2009 at 18:46 | history | edited | Ilya Nikokoshev | CC BY-SA 2.5 |
correction
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Nov 2, 2009 at 18:43 | comment | added | Ilya Nikokoshev | Agreed, but the last paragraph is quite vague anyway... I'll rewrite it still. | |
Nov 2, 2009 at 13:26 | comment | added | José Figueroa-O'Farrill | Another comment is that Chern-Simons theory is an example of a quantum field theory which "plays nicely" with diffeomorphisms, but it is not a gravity theory because it has no metric degreees of freedom. In other words, whereas a quantum gravity theory presumably should "play nicely" with diffeomorphisms, not every theory which does is a theory of gravity. | |
Nov 2, 2009 at 13:24 | comment | added | José Figueroa-O'Farrill | I think the accepted terminology these days is such that a 'quantum field theory' does not include gravity. A theory of quantum gravity is indeed a primary goal of research in hep-th and gr-qc, but it is questionable whether it is in the form of a quantum field theory. The current thinking is that quantum field theories are effective theories of a more fundamental theory (perhaps a string/M theory, perhaps something else). | |
Oct 30, 2009 at 23:15 | history | edited | Ilya Nikokoshev | CC BY-SA 2.5 |
+quantum
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Oct 30, 2009 at 23:07 | history | edited | Ilya Nikokoshev | CC BY-SA 2.5 |
explanation
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Oct 30, 2009 at 22:55 | history | answered | Ilya Nikokoshev | CC BY-SA 2.5 |