Fine-Tuning in DBI Inflationary Mechanism

Details Fine-Tuning in DBI Inflationary Mechanism Fine-Tuning in DBI Inflationary Mechanism

2008-07-21

arxiv.org/abs/0807.3191v4

JCAP 0812:009,2008

Physics

High Energy Physics

High Energy Physics - Theory

13 pages; v4, several discussions expanded, JCAP version

Scientific paper

10.1088/1475-7516/2008/12/009

We show a model-independent fine-tuning issue in the DBI inflationary mechanism. DBI inflation requires a warp factor h small enough to sufficiently slow down the inflaton. On the other hand, the Einstein equation in extra dimensions under the inflationary background deforms the warp space in the IR side. Generically these two locations coincide with each other, spoiling the DBI inflation. The origin and tuning of this ``h-problem'' is closely related, through the AdS/CFT duality, to those of the well-known ``eta-problem'' in the slow-roll inflationary mechanism.

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