We show that the *\beta*-symmetry is broken by the higher derivative couplings at order *\alpha'*. In particular, we show that the *\beta*-transformation of the parity-odd part of the effective action of the heterotic string theory at order *\alpha'* produces, among other things, a four-flux term which can not be removed... Show more

April 30, 2023

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An obstacle in $β$-symmetry at order $α'$

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