
TL;DR
This paper introduces a covariant, kappa-symmetric superstring action in doubled superspace, manifestly T-duality invariant, combining two superspaces with chiral boson actions via PST technique, aligning with Green-Schwarz superstring degrees of freedom.
Contribution
It presents a new superstring action in doubled superspace that is covariant, kappa-symmetric, and T-duality invariant, constructed using the PST technique.
Findings
The action reproduces Green-Schwarz superstring degrees of freedom.
It achieves manifest T-duality invariance.
Chirality conditions emerge as gauge-fixed equations of motion.
Abstract
The covariant and kappa-symmetric action for superstring in direct product of two flat D=10 N=1 superspaces is presented. It is given by the sum of supersymmetric generalization of two copies of chiral boson actions constructed with the use of the Pasti-Sorokin-Tonin (PST) technique. The chirality of 8 `left' bosons and 8 `left' fermions and the anti-chirality of their `right' counterparts are obtained as gauge fixed version of the equations of motion, so that the physical degrees of freedom are essentially those of the II Green-Schwarz superstring. Our action is manifestly T-duality invariant as the fields describing oscillating and winding modes enter it on equal footing.
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