Take a world with $D=3+n$ space-time dimensions, where $n$ are extra space-like dimensions.

With extra-dimensional newton gravity


Can $n$ affect IF the extra dimension is "Grassmann"-like or "time-like" instead "space-like"?

  • $\begingroup$ To reopen this post (v1). consider to only ask one subquestion per post. $\endgroup$ – Qmechanic Sep 15 '18 at 11:41
  • $\begingroup$ Reformulation with unified argument. $\endgroup$ – riemannium Sep 15 '18 at 11:42
  • $\begingroup$ What type of dimensions are the first 3 in $D=3+n$? $\endgroup$ – Qmechanic Sep 15 '18 at 11:43
  • $\begingroup$ Space-like, of course...I ask this, because...I know some bits of the answer...But I am curious of how others see the "issue" if "n" are not "space-like" dimensions... $\endgroup$ – riemannium Sep 15 '18 at 11:46
  • $\begingroup$ The subquestion about multiple time dimensions seems to be a duplicate of physics.stackexchange.com/q/43322/2451 , physics.stackexchange.com/q/43630/2451 and links therein. $\endgroup$ – Qmechanic Sep 15 '18 at 11:48

Grassmann-odd dimensions have no topology or metric. One cannot assign a numerical value to the soul of a supernumber, cf. this related Phys.SE post.

So to answer the question what happen to gravity (in a non-relativistic limit) of some superfield theory, one can remove all the $\theta$-variables, and ask the same question in the corresponding component theory.


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