%0 Journal Article %1 Chen2008 %A Chen, Xingang %D 2008 %K DBI cosmology inflation %T Fine-Tuning in DBI Inflationary Mechanism %U http://arxiv.org/abs/0807.3191 %X 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.

@article{Chen2008, 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. }, added-at = {2009-09-01T11:30:48.000+0200}, author = {Chen, Xingang}, biburl = {https://www.bibsonomy.org/bibtex/2cebc618e7feefd1aa3ff3a931dafa299/jpschaar}, description = {Fine-Tuning in DBI Inflationary Mechanism}, interhash = {4a110b735ff4ea7775c10e28a739e90b}, intrahash = {cebc618e7feefd1aa3ff3a931dafa299}, keywords = {DBI cosmology inflation}, note = {cite arxiv:0807.3191 Comment: 13 pages; v4, several discussions expanded, JCAP version}, timestamp = {2009-09-01T11:30:48.000+0200}, title = {Fine-Tuning in DBI Inflationary Mechanism}, url = {http://arxiv.org/abs/0807.3191}, year = 2008 }