Problem 14.3a

A First Course in String Theory
 
 
14.3 Massive level in the open superstring.

~~~

b_i^2 = 0

b_i b_j = - b_j b_i

i_1 \ne i_2

Since the sign is ignored, the number of possible b^i b^j states is \frac{1}{2} (8) (7) = 28.

The number of possible b^i b^j b^k states is \frac{1}{6} (8) (7) (6) = 56.

The number of possible b^i b^j b^k b^l states is {8 \choose 4} = 70.

— Me@2015-09-27 10:40:30 AM
 
 
 
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