Abstract
We show a model-independent fine-tuning issue in the DBI inflationary mechanism. DBI inflation requires awarp factor h small enough to sufficiently slow down the inflation. On the other hand,the Einstein equation in extra dimensions under the inflationary backgrounddeforms the warp space on the IR side. Generically these two locations coincidewith 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‘η problem’ in the slow-roll inflationary mechanism.
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