A First Course in String Theory
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13.6 Unoriented closed strings
This problem is the closed string version of Problem 12.12. The closed string with
and fixed
is a parameterized closed curve in spacetime. The orientation of a string is the direction of the increasing
on this curve.
…
Introduce an orientation reversing twist operator such that
Moreover, declare that
(b) Used the closed string oscillator expansion (13.24) to calculate
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Equation (13.24):
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By comparing with
, we have:
— Me@2019-11-24 04:33:23 PM
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2019.11.24 Sunday (c) All rights reserved by ACHK