Corpus ID: 236171057

Form Factors and Spectral Densities from Lightcone Conformal Truncation

@inproceedings{Chen2021FormFA,
  title={Form Factors and Spectral Densities from Lightcone Conformal Truncation},
  author={Hongbin Chen and A. Liam Fitzpatrick and Denis Karateev},
  year={2021}
}
We use the method of Lightcone Conformal Truncation (LCT) to obtain form factors and spectral densities of local operators $\mathcal{O}$ in $\phi^4$ theory in two dimensions. We show how to use the Hamiltonian eigenstates from LCT to obtain form factors that are matrix elements of a local operator $\mathcal{O}$ between single-particle bra and ket states, and we develop methods that significantly reduce errors resulting from the finite truncation of the Hilbert space. We extrapolate these form… Expand
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