A First Course in String Theory
14.3 Massive level in the open superstring
How come R sector has a factor 16 while NS sector has not?
p.319 “The overall multiplicative factor appears because each combination of oscillators gives rise to 16 states by acting on each of the available ground states.”
p.319 “We note that the R coefficients are actually double the corresponding NS coefficients. This is not a coincidence, as we will see in the following section.”
p.320 “We have seen that the Ramond sector has world-sheet supersymmetry: there are equal numbers of fermionic and bosonic states at each mass level.”
With the factor 16, how come the R coefficients are only double, but not 16 times as big as the corresponding NS coefficients?
It is caused by the difference of and .
— Me@2015.10.06 08:23 AM
2015.10.06 Tuesday (c) All rights reserved by ACHK