Abstract
It has been argued that rather generic features of string-inspired inflationary theories with low-energy supersymmetry (SUSY) make it difficult to achieve inflation with a Hubble scale H > m 3/2, where m 3/2 is the gravitino mass in the SUSY-breaking vacuum state. We present a class of string-inspired supergravity realizations of chaotic inflation where a simple, dynamical mechanism yields hierarchically small scales of post-inflationary supersymmetry breaking. Within these toy models we can easily achieve small ratios between m 3/2 and the Hubble scale of inflation. This is possible because the expectation value of the superpotential 〈W〉 relaxes from large to small values during the course of inflation. However, our toy models do not provide a reasonable fit to cosmological data if one sets the SUSY-breaking scale to m 3/2 ≤ TeV. Our work is a small step towards relieving the apparent tension between high-scale inflation and low-scale supersymmetry breaking in string compactifications.
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ArXiv ePrint: 1003.4265
On leave of absence from Stanford University and SLAC. (Shamit Kachru)
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He, T., Kachru, S. & Westphal, A. Gravity waves and the LHC: towards high-scale inflation with low-energy SUSY. J. High Energ. Phys. 2010, 65 (2010). https://doi.org/10.1007/JHEP06(2010)065
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DOI: https://doi.org/10.1007/JHEP06(2010)065