The M branes in M theory are a configuration of the fields of 11D sugra, but sugra is a low energy limit of M theory. So do these fields exist at the fundamental level of the theory, and if not, what are m branes? Also, how does the M5 brane get its magnetic charge? An object gets its electric charge by the motion around the circular dimension. Does the same apply for magnetic charge?

  • $\begingroup$ of course m-branes exist in M-theory, otherwise they wouldn't exist in 11D SUGRA. M5 is magnetic dual of M2, that's why it has magnetic charge. $\endgroup$ – Kosm Aug 19 '18 at 8:25
  • $\begingroup$ @Kosm what I’m asking is if the fields in 11D SUGRA exist in the fundamental level of M theory. If they don’t, how would M branes arise? $\endgroup$ – user164839 Aug 19 '18 at 16:58
  • $\begingroup$ they do exist in M-theory in some form, but the exact picture is not known, because complete non-perturbative M-theory is not known. $\endgroup$ – Kosm Aug 19 '18 at 17:03
  • $\begingroup$ @Kosm This then means that M branes are not fundamental, and it's really the SUGRA fields that are fundamental. Correct? $\endgroup$ – user164839 Aug 19 '18 at 22:52
  • $\begingroup$ M-branes ARE solution to sugra $\endgroup$ – Kosm Aug 20 '18 at 0:34

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