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  • Letter
  • Open Access

Correlators from graphical amplitudes

Ross Glew*

  • *Contact author: r.glew@herts.ac.uk
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Phys. Rev. D 112, L061302 – Published 29 September, 2025

DOI: https://doi.org/10.1103/cg2r-gtkt

Abstract

Recently, the wavefunction coefficients for conformally coupled scalars in an Friedmann-Robertson-Walker cosmology have been presented as a sum over amplitudelike functions known as amplitubes. In this work, we extend this analysis to full correlation functions. Remarkably, the amplitube expansion of the correlator exhibits many vanishing contributions that are otherwise present in the expansion of the wavefunction. Moreover, while the wavefunction coefficients suffer from relative minus signs between terms, the surviving terms in thte correlation function do not. These observations point to a hidden simplicity in the structure of the correlation function compared to that of the wavefunction coefficient.

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Phys. Rev. D 112, L061302– Published 29 September, 2025
  • Received 12 July 2025
  • Accepted 3 September 2025
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