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2010

Primordial non-Gaussianity from the DBI Galileons

Mizuno, Shuntaro, Koyama, Kazuya

Understand

We study primordial fluctuations generated during inflation in a class of models motivated by the DBI Galileons, which are extensions of the DBI action that yield second order field equations.

This class of models generalises the DBI Galileons in a similar way with K-inflation.
We calculate the primordial non-Gaussianity from the bispectrum of the curvature perturbations at leading order in the slow-varying approximations.
We show that the estimator for the equilateral-type non-Gaussianity, $f_{\rm NL} ^{equil}$, can be applied to measure the amplitude of the primordial bispectrum even in the presence of the Galileon-like term although it gives a slightly different momentum dependence from K-inflation models.

Built on

X. Gao and B. Hu, JCAP 0908
Original
1920
Earlier work this paper cites.
C. Deffayet, S. Deser and G. Esposito-Farese, Phys. Rev. D 80
Original
1967
Earlier work this paper cites.
J. Garriga and V. F. Mukhanov, Phys. Lett. B 458
1999
Earlier work this paper cites.
J. M. Maldacena, JHEP 0305
2003
Earlier work this paper cites.
E. Silverstein and D. Tong, Phys. Rev. D 70
2004
Earlier work this paper cites.
M. Alishahiha, E. Silverstein and D. Tong, Phys. Rev. D 70
2004
Earlier work this paper cites.
D. Babich, P. Creminelli and M. Zaldarriaga, JCAP 0408
2004
Earlier work this paper cites.
X. Chen, Phys. Rev. D 71
2005
Earlier work this paper cites.
X. Chen, JHEP 0508
2005
Earlier work this paper cites.
X. Chen, Phys. Rev. D 72
2005
Earlier work this paper cites.
A. Gruzinov, Phys. Rev. D 71
2005
Earlier work this paper cites.
S. Weinberg, Phys. Rev. D 72
2005
Earlier work this paper cites.
S. E. Shandera and S. H. Tye, JCAP 0605
2006
Earlier work this paper cites.
X. Chen, M. x. Huang and G. Shiu, Phys. Rev. D 74
2006
Earlier work this paper cites.
X. Chen, M. x. Huang, S. Kachru and G. Shiu, JCAP 0701
2007
Earlier work this paper cites.