Closed string degeneracies | A First Course in String Theory

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(a) State the values of and give the degeneracies for the first five mass levels of the closed bosonic string theory.

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But for non-massless states, this probably is not true anymore:

So the total number of states for () is

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**Should be 10 or 26?**

p.324 “Out of 26 left-moving bosonic coordinates of the bosonic factor only ten of them are matched by the right-moving bosonic coordinates of the superstring factor.”

should be 26 for bosonic strings. So the total number of states is

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**What does the difference of this part and Section 14.6 come from?**

This part is for bosonic closed string, while Section 14.6 is for bosonic open string. There is no to consider in Section 14.6.

p.290 “A basis vector belongs to the state space *if and only if* it satisfies the level-matching constraint”

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**Can we create a formula for the number of states?**

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— Me@2018-04-23 11:31:16 AM

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2018.04.23 Monday (c) All rights reserved by ACHK