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A Renormalisation group for TCSA

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arxiv hep-th/0612203 v1 pith:BKO27P7H submitted 2006-12-19 hep-th

Giovanni Feverati , Kevin Graham , Paul A. Pearce , Gabor Zs. Toth , Gerard Watts This is my paper · ORCID
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keywords grouprenormalisationtcsaboundaryconformalconstantcouplingflows
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We discuss the errors introduced by level truncation in the study of boundary renormalisation group flows by the Truncated Conformal Space Approach. We show that the TCSA results can have the qualitative form of a sequence of RG flows between different conformal boundary conditions. In the case of a perturbation by the field phi(13), we propose a renormalisation group equation for the coupling constant which predicts a fixed point at a finite value of the TCSA coupling constant and we compare the predictions with data obtained using TBA equations.

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Cited by 1 Pith paper

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  1. Systematic Improvement of Hamiltonian Truncation Effective Theory

    hep-th 2025-07 conditional novelty 6.0 of 10

    NLO matching corrections with nonlocal terms are computed for 1+1D λφ⁴ Hamiltonian truncation, and the eigenvalue error is shown to scale as 1/Emax⁴, confirming the effective theory power counting.

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