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We study the effects of non-trivial initial quantum states for inflationary fluctuations within the context of the effective field theory for inflation constructed by Cheung et al.
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P. Creminelli, A. Nicolis, L. Senatore, M. Tegmark, and M. Zaldarriaga, Limits on non-Gaussianities from WMAP data
2006
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2007
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R. Holman and A. J. Tolley, Enhanced non-Gaussianity from excited initial states
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2011
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A. Ashoorioon and G. Shiu, A note on calm excited states of inflation
2011
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D. Chialva, Signatures of very high energy physics in the squeezed limit of the bispectrum
2012
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S. Kundu, Inflation with general initial conditions for scalar perturbations
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