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High Energy Physics - Theory

arXiv:0807.3191 (hep-th)
[Submitted on 21 Jul 2008 (v1), last revised 16 Nov 2008 (this version, v4)]

Title:Fine-Tuning in DBI Inflationary Mechanism

Authors:Xingang Chen
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Abstract: 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.
Comments: 13 pages; v4, several discussions expanded, JCAP version
Subjects: High Energy Physics - Theory (hep-th); Astrophysics (astro-ph); High Energy Physics - Phenomenology (hep-ph)
Report number: MIT-CTP-3961
Cite as: arXiv:0807.3191 [hep-th]
  (or arXiv:0807.3191v4 [hep-th] for this version)
  https://doi.org/10.48550/arXiv.0807.3191
Journal reference: JCAP 0812:009,2008
Related DOI: https://doi.org/10.1088/1475-7516/2008/12/009

Submission history

From: Xingang Chen [view email]
[v1] Mon, 21 Jul 2008 17:04:20 UTC (11 KB)
[v2] Wed, 23 Jul 2008 19:25:35 UTC (11 KB)
[v3] Sun, 27 Jul 2008 18:03:11 UTC (12 KB)
[v4] Sun, 16 Nov 2008 19:52:48 UTC (13 KB)
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