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Double soft limits of cosmological correlations
Mehrdad Mirbabayi (Institute for Advanced Study), Matias Zaldarriaga (Institute for Advanced Study)
Journal of Cosmology and Astroparticle Physics
DOI: 10.1088/1475-7516/2015/03/025 (Physics and Astronomy)
Licence : CC BY
Résumé : Correlation functions of two long-wavelength modes with several short-wavelength modes are shown to be related to lower order correlation functions, using the background wave method, and independently, by exploiting symmetries of the wavefunction of the Universe. These soft identities follow from the non-linear extension of the adiabatic modes of Weinberg, and their generalization by Hinterbichler et al. The extension is shown to be unique. A few checks of the identities are presented.
Publié le 12 Mar. 2015