The double soft limit in cosmological correlation functions and graviton exchange effects

@article{Alinea2016TheDS,
  title={The double soft limit in cosmological correlation functions and graviton exchange effects},
  author={Allan L. Alinea and Takahiro Kubota and Nobuhiko Misumi},
  journal={arXiv: High Energy Physics - Theory},
  year={2016}
}
The graviton exchange effect on cosmological correlation functions is examined by employing the double-soft limit technique. A new relation among correlation functions that contain the effects due to graviton exchange diagrams in addition to those due to scalar-exchange and scalar-contact-interaction, is derived by using the background field method and independently by the method of Ward identities associated with dilatation symmetry. We compare these three terms, putting small values for the… 
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