T T ¯ $$ T\overline{T} $$ -deformed fermionic theories revisited

Abstract

Abstract We revisit T T ¯ $$ T\overline{T} $$ deformations of d = 2 theories with fermions with a view toward the quantization. As a simple illustration, we compute the deformed Dirac bracket for a Majorana doublet and confirm the known eigenvalue flows perturbatively. We mostly consider those T T ¯ $$ T\overline{T} $$ theories that can be reconstructed from string-like theories upon integrating out the worldsheet metric. After a quick overview of how this works when we add NSR-like or GS-like fermions, we obtain a known non-supersymmetric T T ¯ $$ T\overline{T} $$ deformation of a N $$ \mathcal{N} $$ = (1, 1) theory from the latter, based on the Noether energy-momentum. This world- sheet reconstruction implies that the latter is actually a supersymmetric subsector of a d = 3 GS-like model, implying hidden supercharges, which we do construct explicitly. This brings us to ask about different T T ¯ $$ T\overline{T} $$ deformations, such as manifestly supersymmetric T T ¯ $$ T\overline{T} $$ and also more generally via the symmetric energy-momentum. We show that, for theories with fermions, such choices often lead us to doubling of degrees of freedom, with potential unitarity issues. We show that the extra sector develops a divergent gap in the “small deformation” limit and decouples in the infrared, although it remains uncertain in what sense these can be considered a deformation.

Keywords

• Field Theories in Lower Dimensions
• Integrable Field Theories
• Superstrings and Heterotic Strings
• Extended Supersymmetry