A three-field inflation model is constructed in a perturbative large-volume string setup where loop and higher-derivative corrections stabilize the moduli and produce a two-stage inflationary trajectory.
Non-compact Calabi--Yau Manifolds and Localized Gravity
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abstract
We study localization of gravity in flat space in superstring theory. We find that an induced Einstein-Hilbert term can be generated only in four dimensions, when the bulk is a non-compact Calabi-Yau threefold with non-vanishing Euler number. The origin of this term is traced to R^4 couplings in ten dimensions. Moreover, its size can be made much larger than the ten-dimensional gravitational Planck scale by tuning the string coupling to be very small or the Euler number to be very large. We also study the width of the localization and discuss the problems for constructing realistic string models with no compact extra dimensions.
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Three-Field String Inflation with Perturbative Corrections: Dynamics and Implications
A three-field inflation model is constructed in a perturbative large-volume string setup where loop and higher-derivative corrections stabilize the moduli and produce a two-stage inflationary trajectory.