Journal
PHYSICAL REVIEW D
Volume 87, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.87.103516
Keywords
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Funding
- CITA National Fellowship
- Natural Science and Engineering Research Council of Canada
- Knowledge Innovation Program of the Chinese Academy of Science
- National Natural Science Foundation of China [10821504, 10705041, 10975032, 11175042]
- National Ministry of Education of China [NCET-09-0276, N100505001, N120505003]
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In this paper, we compare brane inflation models with the Planck data and the pre-Planck data (which combines WAMP, ACT, SPT, BAO and H-0 data). The Planck data prefer a spectral index less than unity at more than 5 sigma confidence level, and a running of the spectral index at around 2 sigma confidence level. We find that the KKLMMT model can survive at the level of 2 sigma only if the parameter beta (the conformal coupling between the Hubble parameter and the inflaton) is less than O(10(-3)), which indicates a certain level of fine-tuning. The IR DBI model can provide a slightly larger negative running of spectral index and red tilt, but in order to be consistent with the non-Gaussianity constraints from Planck, its parameter also needs fine-tuning at some level.
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