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1979
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1982
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1989
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1992
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J. García-Bellido and D. Wands, Phys.Rev. D53
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1999
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2006
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A. Aazami and R. Easther, JCAP 0603
2006
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2013

Easther, Richard, Frazer, Jonathan, Peiris, Hiranya V. et al.

We explore whether multifield inflationary models make unambiguous predictions for fundamental cosmological observables.

Focusing on $N$-quadratic inflation, we numerically evaluate the full perturbation equations for models with 2, 3, and $\mathcal{O}(100)$ fields, using several distinct methods for specifying the initial values of the background fields.
All scenarios are highly predictive, with the probability distribution functions of the cosmological observables becoming more sharply peaked as $N$ increases.
For $N=100$ fields, 95% of our Monte Carlo samples fall in the ranges $n_s \in (0.9455,0.9534)$; $\alpha \in (-9.741,-7.047)\times 10^{-4}$; $r\in(0.1445,0.1449)$; and $r_\mathrm{iso} \in (0.02137,3.510)\times 10^{-3}$ for the spectral index, running, tensor-to-scalar ratio, and isocurvature-to-adiabatic ratio, respectively.

D. W. Scott, Biometrika 66
1979
Earlier work this paper cites.
S. A. Kim and A. R. Liddle, Phys.Rev. D76
Original
1982
Earlier work this paper cites.
D. Salopek, J. Bond, and J. M. Bardeen, Phys.Rev. D40
1989
Earlier work this paper cites.
D. Polarski and A. A. Starobinsky, Nucl.Phys. B385
1992
Earlier work this paper cites.
J. García-Bellido and D. Wands, Phys.Rev. D53
1996
Earlier work this paper cites.
A. R. Liddle, A. Mazumdar, and F. E. Schunck, Phys.Rev. D58
1998
Earlier work this paper cites.
P. Kanti and K. A. Olive, Phys.Lett. B464
1999
Earlier work this paper cites.
M. Grana, Phys.Rept. 423
2006
Earlier work this paper cites.
R. Easther and L. McAllister, JCAP 0605
2006
Earlier work this paper cites.
S. A. Kim and A. R. Liddle, Phys.Rev. D74
2006
Earlier work this paper cites.
A. Aazami and R. Easther, JCAP 0603
2006
Earlier work this paper cites.
M. R. Douglas and S. Kachru, Rev.Mod.Phys. 79
2007
Earlier work this paper cites.
F. Denef, M. R. Douglas, and S. Kachru, Ann.Rev.Nucl.Part.Sci. 57
2007
Earlier work this paper cites.