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Orbifold actions and twist operators

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A twist operator $\sigma$ is the operator that acts on the untwisted vacuum $|0\rangle$ to create a twisted vacuum $\sigma|0\rangle$. States belonging to the twisted sector of an orbifold are built on such twisted vacua (which are also in 1-1 correspondence with the fixed points of the orbifold action).

My question is given a specific twist operator $\sigma$, how can I possibly deduce the orbifold action that corresponds to it?

More specifically, let
$$\sigma=\psi^1+i\psi^2$$
the operator that arises after bosonizing two real fermions. If the boundary conditions for the fermions are known, let's say $\psi^1\rightarrow \psi^1$ and $\psi^2\rightarrow -\psi^2$ then we have some information on $\sigma$. We should be able to interpret this $\sigma$ as the twist operator that generates a twisted sector of some orbifold, but what would the orbifold action in this case be?

asked Jan 6, 2016 in Theoretical Physics by Heterotic (525 points) [ no revision ]

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