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Abstract: We investigate the noncommutative effect on the non-Gaussianities ofprimordial cosmological perturbation. In the lowest order of string length andslow-roll parameter, we find that in the models with small speed of sound thenoncommutative modifications could be observable if assuming a relatively lowstring scale. In particular, the dominant modification of non-Gaussianityestimator f {NL} could reach O1 in DBI inflation and K-inflation. Thecorrections are sensitive to the speed of sound and the choice of string lengthscale. Moreover the shapes of the corrected non-Gaussianities are distinct fromthat of ordinary ones.



Author: Kejie Fang, Bin Chen, Wei Xue

Source: https://arxiv.org/







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