Planck 2018 and Brane Inflation Revisited
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We revisit phenomenological as well as string-theoretical aspects of D-brane inflation cosmological models. Phenomenologically these models stand out on par with $\alpha$-attractors, as models with Planck-compatible values of $n_s$, moving down to the sweet spot in the data with decreasing value of $r$. On the formal side we present a new supersymmetric version of these models in the context of de Sitter supergravity with a nilpotent multiplet and volume modulus stabilization. The geometry of the nilpotent multiplet is evaluated in the framework of string theory.
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Cited by 4 Pith papers
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New family of ξ-attractors yields ns in the interval 1-2/N ≤ ns < 1-1/N with r approaching zero as ξ grows large, plus a supergravity embedding.
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Jordan Frame in Supergravity and Cosmology
New supergravity ξ-attractors built by choosing the Kähler potential first match exponential and polynomial α-attractors with ξ=1/(6α), and Palatini-style supergravity with scalars is shown inconsistent with superconf...
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Jordan Frame in Supergravity and Cosmology
The paper introduces new exponential and polynomial supergravity ξ-attractor models in the Jordan frame with non-minimal coupling and shows that Palatini gravity with independent affine connection has no supergravity ...
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New Exponential and Polynomial $\xi$-attractors
New ξ-attractors with non-minimal coupling and non-canonical kinetics yield Einstein-frame exponential and polynomial potentials whose ns spans 1-2/N to 1-1/N and r can reach zero as ξ grows, fitting Planck, BICEP/Kec...
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