= Twisted sector
{wiki=Twisted_sector}
In the context of theoretical physics—particularly in string theory—the term "twisted sector" refers to a particular construction related to the compactification of extra dimensions and the nature of string states. In string theory, especially in theories involving compactification (where extra dimensions are rolled up to a small scale), the Hilbert space of string states can be divided into different sectors based on how the strings wrap around the compact dimensions.
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