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000275279 0247_ $$2arXiv$$aarXiv:1509.00024
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000275279 0881_ $$aIFT-UAM/CSIC-15-093, DESY-15-166
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000275279 1001_ $$0P:(DE-H253)PIP1018435$$aBroy, Benedict$$b0$$eCorresponding author
000275279 245__ $$aStarobinsky-Type Inflation from $\alpha'$-Corrections
000275279 260__ $$c2015
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000275279 520__ $$aWorking in the Large Volume Scenario (LVS) of IIB Calabi-Yau flux compactifications, we construct inflationary models from recently computed higher derivative $(\alpha')^3$-corrections. Inflation is driven by a Kaehler 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 $V=V_0(1-e^{-\nu\phi})^2$, where we obtain one set-up with $\nu=-1/\sqrt{3}$ and one with $\nu=2/\sqrt{3}$ corresponding to inflation occurring for increasing or decreasing $\phi$ 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 $r\simeq (2\ldots 7)\,\times 10^{-3}$. They hence realise inflation with moderately large fields $\left(\Delta\phi\sim 6\thinspace M_{Pl}\right)$ 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.
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000275279 536__ $$0G:(EU-Grant)320421$$aSPLE - String Phenomenology in the LHC Era (320421)$$c320421$$fERC-2012-ADG_20120216$$x2
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000275279 7001_ $$0P:(DE-H253)PIP1017434$$aCiupke, David$$b1$$udesy
000275279 7001_ $$0P:(DE-HGF)0$$aPedro, Francisco G.$$b2
000275279 7001_ $$0P:(DE-H253)PIP1013212$$aWestphal, Alexander$$b3$$udesy
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