We have studied the non-Gaussian features in single-field slow-roll inflationary scenario, where inflation is preceded by a radiation era. In such a scenario, both bispectrum and trispectrum non-Gaussianities are enhanced. Interestingly, the trispectrum in this scenario does not depend up on the slow-roll parameters, and thus, τNL is larger than fNL, which can be a signature of such a pre-inflationary radiation era.
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