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Perturbative renormalization of the T bar{T}-deformed free massive Dirac fermion

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arxiv 2109.10525 v1 pith:23LQWOUA submitted 2021-09-22 hep-th

Perturbative renormalization of the T bar{T}-deformed free massive Dirac fermion

classification hep-th
keywords deformeddiracfermionfreelagrangianmassivematrixperturbative
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this paper we explicitly carry out the perturbative renormalization of the $T\bar{T}$-deformed free massive Dirac fermion in two dimensions up to second order in the coupling constant. This is done by computing the two-to-two $S$-matrix using the LSZ reduction formula and canceling out the divergences by introducing counterterms. We demonstrate that the renormalized Lagrangian is unambiguously determined by demanding that it gives the correct $S$-matrix of a $T\bar{T}$-deformed integrable field theory. Remarkably, the renormalized Lagrangian is qualitatively very different from its classical counterpart.

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