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Dynamical fine-tuning of initial conditions for small field inflations | | Satoshi Iso
; Kazunori Kohri
; Kengo Shimada
; | | Date: |
18 Nov 2015 | | Abstract: | Small-field inflation (SFI) is widely considered to be unnatural because an
extreme fine-tuning of the initial condition is necessary for sufficiently
large e-folding. In this paper, we show that the unnaturally-looking initial
condition can be dynamically realised without any fine-tuning if the SFI occurs
after rapid oscillations of the inflaton field and particle creations by
preheating. In fact, if the inflaton field $phi$ is coupled to another scalar
field $chi$ through the interaction $g^2 chi^2 phi^2$ and the vacuum energy
during the small field inflation is given by $lambda M^4$, the initial value
can be dynamically set at $(sqrt{lambda}/g) M^2/M_{
m pl}$, which is much
smaller than the typical scale of the potential $M.$ This solves the initial
condition problem in the new inflation model or some classes of the hilltop
inflation models. | | Source: | arXiv, 1511.5923 | | Services: | Forum | Review | PDF | Favorites | |
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