Starobinsky-type inflation from α'-corrections
- Deutsches Elektronen-Synchrotron DESY, Theory Group, 22603 Hamburg (Germany)
Working in the Large Volume Scenario (LVS) of IIB Calabi-Yau flux compactifications, we construct inflationary models from recently computed higher derivative (α'){sup 3}-corrections. Inflation is driven by a Kähler modulus whose potential arises from the aforementioned corrections, while we use the inclusion of string loop effects just to ensure the existence of a graceful exit when necessary. The effective inflaton potential takes a Starobinsky-type form V=V{sub 0}(1−e{sup −νφ}){sup 2}, where we obtain one set-up with ν=−1/√3 and one with ν=2/√3 corresponding to inflation occurring for increasing or decreasing φ respectively. The inflationary observables are thus in perfect agreement with PLANCK, while the two scenarios remain observationally distinguishable via slightly varying predictions for the tensor-to-scalar ratio r. Both set-ups yield r≅ (2... 7) × 10{sup −3}. They hence realise inflation with moderately large fields (Δφ∼ 6 M{sub Pl}) without saturating the Lyth bound. Control over higher corrections relies in part on tuning underlying microscopic parameters, and in part on intrinsic suppressions. The intrinsic part of control arises as a leftover from an approximate effective shift symmetry at parametrically large volume.
- OSTI ID:
- 22525087
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 01; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fibre inflation: observable gravity waves from IIB string compactifications
Linking Starobinsky-type inflation in no-scale supergravity to MSSM