Noncommutative geometry modified non-Gaussianities of cosmological perturbation

Journal Article · Sat Mar 15 00:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.063523· OSTI ID:21249807

Kejie, Fang; Wei, Xue ^[1]; Bin, Chen ^[1]

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1. Department of Physics, Peking University, Beijing 100871 (China)

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 the non-Gaussianity estimator f{sub NL} could reach O(1) in Dirac-Born-Infeld (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.

• OSTI ID: 21249807
• Journal Information: Physical Review. D, Particles Fields, Vol. 77, Issue 6; Other Information: DOI: 10.1103/PhysRevD.77.063523; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BORN-INFELD THEORY
COMMUTATION RELATIONS
CORRECTIONS
COSMOLOGICAL MODELS
DISTURBANCES
INFLATION
MODIFICATIONS
PERTURBATION THEORY
SOUND WAVES
STRING MODELS
VELOCITY