Non-commutative Geometry Modified Non-Gaussianities of Cosmological Perturbation

Details Non-commutative Geometry Modified Non-Gaussianities of Cosmological Perturbation Non-commutative Geometry Modified Non-Gaussianities of Cosmological Perturbation

2007-07-13

arxiv.org/abs/0707.1970v2

Phys.Rev.D77:063523,2008

Astronomy and Astrophysics

Astrophysics

26 pages, 3 figures Added references, changed content

Scientific paper

10.1103/PhysRevD.77.063523

We investigate the noncommutative effect on the non-Gaussianities of primordial cosmological perturbation. In the lowest order of string length and slow-roll parameter, we find that in the models with small speed of sound the noncommutative modifications could be observable if assuming a relatively low string scale. In particular, the dominant modification of non-Gaussianity estimator f_{NL} could reach O(1) in DBI inflation and K-inflation. The corrections are sensitive to the speed of sound and the choice of string length scale. Moreover the shapes of the corrected non-Gaussianities are distinct from that of ordinary ones.

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