Does anyone know if M-Theory is that same as Superstring Field Theory?
Haha does anyone knooooow?
As far as I know neither of these theories is completely understood. It is therefore unlikely that anyone knows if they are or are not "the same."
You might find the responses in this very old thread helpful. Someone asked basically the same question you did. I think the conclusion we came to was something like:
- "Strin[g] field theory is a second quantized formulation of string theory... this is a very technical point to explain. In a nutshell, string field theory is a more general form[al]ism to do calculations in string theory. It's more of a technique than a new theory."
- M-Theory is a variant of string theory with new structures, like an 11th spacetime dimension and the introduction of n-dimensional "branes" in addition to vanilla strings. Pre-M-Theory string theories can be found "inside of" M-Theory (that is, they are dual to special cases of M Theory).
- The two do not have anything to do with each other.
As far as I know String Field Theory techniques not widely used, but M-Theory has been the basis of virtually all string theory research for at least the last decade.
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