Features from the non-attractor beginning of inflation - INSPIRE

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Features from the non-attractor beginning of inflation

Yi-Fu Cai
(
- USTC, Hefei
)
,
Jinn-Ouk Gong
(
- APCTP, Pohang and
- POSTECH, Pohang
)
,
Dong-Gang Wang
(
- USTC, Hefei
)
,
Ziwei Wang
(
- USTC, Hefei
)

Jul 26, 2016

16 pages

Published in:

JCAP 10 (2016) 017

Published: Oct 11, 2016

e-Print:

1607.07872 [astro-ph.CO]

DOI:

10.1088/1475-7516/2016/10/017

Report number:

APCTP-PRE2016-010

View in:

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Abstract: (IOP)

We study the effects of the non-attractor initial conditions for the canonical single-field inflation. The non-attractor stage can last only several e-folding numbers, and should be followed by hilltop inflation. This two-stage evolution leads to large scale suppression in the primordial power spectrum, which is favored by recent observations. Moreover we give a detailed calculation of primordial non-Gaussianity due to the ``from non-attractor to slow-roll'' transition, and find step features in the local and equilateral shapes. We conclude that a plateau-like inflaton potential with an initial non-attractor phase yields interesting features in both power spectrum and bispectrum.

Note:

17 pages, 9 figures, references added, several figures replotted

The very early universe
initial condition of inflation
primordial perturbation
non-Gaussianity
power spectrum: primordial
inflaton: potential
inflation
slow-roll approximation
boundary condition
suppression

References(32)

Figures(10)

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