Critical dimension D=10 for superstring (vs D=26 bosonic). Type-IIA / IIB / I / heterotic 5 string-theories. M-theory unifies in 11D. Foundation of string-phenomenology.
Critical dimension D=10 for superstring (vs D=26 bosonic). Type-IIA / IIB / I / heterotic 5 string-theories. M-theory unifies in 11D. Foundation of string-phenomenology.