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Primordial non-Gaussianity generated in an inflationary model where inflationis preceded by a radiation era is discussed. It is shown that both bispectrumand trispectrum non-Gaussianities are enhanced due to the presence ofpre-inflationary radiation era. One distinguishing feature of such a scenariois that the trispectrum non-Gaussianity is larger than the bispectrum one.

Primordial non-Gaussianity as a signature of pre-inflationary radiation era