Monodromy in the CMB : Gravity Waves and String Inflation

  title={Monodromy in the CMB : Gravity Waves and String Inflation},
  author={E. Silverstein and Alexander Westphal},
We present a simple mechanism for obtaining large-field inflation, and hence a gravitational wave signature, from string theory compactified on twisted tori. For Nil manifolds, we obtain a leading inflationary potential proportional to φ 2/3 in terms of the canonically normalized field φ, yielding predictions for the tilt of the power spectrum and the tensor-to-scalar ratio, n s ≈ 0.98 and r ≈ 0.04 with 60 e-foldings of inflation; we note also the possibility of a variant with a candidate… CONTINUE READING
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