In the string theory of Edward Witten:
A)there are 11 dimensions, including two time dimensions (essentially "forward" and "backward").
B)all of the dimensions are coiled up tightly like coiled strings.
C)the 11 dimensions include several dimensions that ought to be observable at very low temperatures.
D)seven dimensions are coiled tightly like coiled strings.

Question

Quizplus · Accepted Answer

In Edward Witten's version of string theory, which is part of M-theory, there are a total of 11 dimensions. Of these, 7 dimensions are theorized to be compactified or coiled up tightly, beyond our current observational capabilities, while the remaining 4 dimensions are the ones we are familiar with (3 dimensions of space and 1 of time).

In the String Theory of Edward Witten