The cosmological bootstrap: weight-shifting operators and scalar seeds

@article{Baumann2020TheCB,
  title={The cosmological bootstrap: weight-shifting operators and scalar seeds},
  author={Daniel Baumann and Carlos Duaso Pueyo and Austin Joyce and Hayden Hyungdong Lee and Guilherme L. Pimentel},
  journal={Journal of High Energy Physics},
  year={2020}
}
Abstract A key insight of the bootstrap approach to cosmological correlations is the fact that all correlators of slow-roll inflation can be reduced to a unique building block — the four-point function of conformally coupled scalars, arising from the exchange of a massive scalar. Correlators corresponding to the exchange of particles with spin are then obtained by applying a spin-raising operator to the scalar-exchange solution. Similarly, the correlators of massless external fields can be… 

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