期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 3, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP03(2016)113
关键词
D-branes; Flux compactifications; Cosmology of Theories beyond the SM; Supergravity Models
资金
- MINECO [FPA2012-32828]
- REA grant from the People Programme of FP7 (Marie Curie Action) [PCIG10-GA-2011-304023]
- ERC Advanced Grant SPLE [ERC-2012-ADG-20120216-320421]
- Centro de Excelencia Severo Ochoa Programme [SEV-2012-0249]
- FPI [SVP-2014-068283, SVP-2013-067949]
- Ramon y Cajal programme [RYC-2009-05096]
- Max Planck Society
- NSF [PHY-1066293]
- UW-Madison
We develop new scenarios of large field inflation in type IIA string compact-ifications in which the key ingredient is a D6-brane that creates a potential for a B-field axion. The potential has the multi-branched structure typical of F-term axion monodromy models and, near its supersymmetric minima, it is described by a 4d supergravity model of chaotic inflation with a stabiliser field. The same statement applies to the D6-brane Wilson line, which can also be considered as an inflaton candidate. We analyse both cases in the context of type IIA moduli stabilisation, finding an effective potential for the inflaton system and a simple mechanism to lower the inflaton mass with respect to closed string moduli stabilised by fluxes. Finally, we compute the B-field potential for trans-Planckian field values by means of the DBI action. The effect of Planck suppressed corrections is a flattened potential which, in terms of the compactification parameters, interpolates between linear and quadratic inflation. This renders the cosmological parameters of these models compatible with current experimental bounds, with the tensor-to-scalar ratio ranging as 0.08 less than or similar to r less than or similar to 0.12.
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