Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-10-18
Phys.Rev.D77:043501,2008
Physics
High Energy Physics
High Energy Physics - Theory
30 + 16 pages, 5 figures. Added references, corrected typos
Scientific paper
10.1103/PhysRevD.77.043501
The majority of models of inflation in string theory predict an absence of measurable gravitational waves, r << 10^{-3}. The most promising proposals for making string theoretic models that yield measurable tensor fluctuations involve axion fields with slightly broken shift symmetry. We consider such models in detail, with a particular focus on the N-flation scenario and on axion valley/natural inflation models. We find that in Calabi-Yau threefold compactifications with logarithmic Kahler potentials K it appears to be difficult to meet the conditions required for axion inflation in the supergravity regime. However, in supergravities with an (approximately) quadratic shift-symmetric K, axion inflation may be viable. Such Kahler potentials do arise in some string models, in specific limits of the moduli space. We describe the most promising classes of models; more detailed study will be required before one can conclude that working models exist.
Kallosh Renata
Sivanandam Navin
Soroush Masoud
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