Red Spectral Tilt and Observable Gravity Waves in Shifted Hybrid
  Inflation
  We consider supersymmetric shifted hybrid inflation models with a red tilted
scalar spectral index n_s in agreement with the WMAP 7-yr central value. If
non-minimal supergravity corrections are included, these models can also
support a tensor-to-scalar ratio as large as r = 0.02, which may be observable
by the Planck Satellite. In contrast to the standard supersymmetric hybrid
inflation scenario, topological defects produced via gauge symmetry breaking
are inflated away in the shifted version of the theory.
