96 citations · 740 across the 17 of their papers we have counts for
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Modulated Natural Inflation
Rolf Kappl, Hans Peter Nilles, Martin Wolfgang Winkler
We discuss some model-independent implications of embedding (aligned) axionic inflation in string theory. As a consequence of string theoretic duality symmetries the pure cosine po…
Natural Inflation and Low Energy Supersymmetry
Rolf Kappl, Hans Peter Nilles, Martin Wolfgang Winkler
Natural (axionic) inflation provides a well-motivated and predictive scheme for the description of the early universe. It leads to sizeable primordial tensor modes and thus a high…
Aligned Natural Inflation: Monodromies of two Axions
Rolf Kappl, Sven Krippendorf, Hans Peter Nilles
Natural (axionic) inflation can accommodate sizeable primordial tensor modes but suffers from the necessity of trans-Planckian variations of the inflaton field. This problem can be…
The Hilbert basis method for D-flat directions and the superpotential
Rolf Kappl, Michael Ratz, Christian Staudt
We discuss, using the Hilbert basis method, how to efficiently construct a complete basis for D-flat directions in supersymmetric Abelian and non-Abelian gauge theories. We extend…
String-derived MSSM vacua with residual R symmetries
Rolf Kappl, Bjoern Petersen, Stuart Raby +3
Recently it was shown that there is a unique Z_4^R symmetry for the MSSM which allows the Yukawa couplings and dimension five neutrino mass operator, forbids the mu term and commut…
Approximate R-symmetries and the mu term
Felix Brummer, Rolf Kappl, Michael Ratz +1
We discuss the role of approximate U(1)_R symmetries for the understanding of hierarchies in Nature. Such symmetries may explain a suppressed expectation value of the superpotentia…