Noncommutative geometry modified non-Gaussianities of cosmological perturbation
Journal Article
·
· Physical Review. D, Particles Fields
- 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, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cosmological perturbations and noncommutative tachyon inflation
Primordial perturbations and non-Gaussianities in DBI and general multifield inflation
Effects of scale-dependent non-Gaussianity on cosmological structures
Journal Article
·
Tue Dec 14 23:00:00 EST 2004
· Physical Review. D, Particles Fields
·
OSTI ID:20698213
Primordial perturbations and non-Gaussianities in DBI and general multifield inflation
Journal Article
·
Mon Sep 15 00:00:00 EDT 2008
· Physical Review. D, Particles Fields
·
OSTI ID:21250831
Effects of scale-dependent non-Gaussianity on cosmological structures
Journal Article
·
Tue Apr 15 00:00:00 EDT 2008
· Journal of Cosmology and Astroparticle Physics
·
OSTI ID:22137839