Abstract
We revisit \( T\overline{T} \) 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 \( T\overline{T} \) 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 \( T\overline{T} \) deformation of a \( \mathcal{N} \) = (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 \( T\overline{T} \) deformations, such as manifestly supersymmetric \( T\overline{T} \) 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.
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Lee, KS., Yi, P. & Yoon, J. \( T\overline{T} \)-deformed fermionic theories revisited. J. High Energ. Phys. 2021, 217 (2021). https://doi.org/10.1007/JHEP07(2021)217
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DOI: https://doi.org/10.1007/JHEP07(2021)217