Alexander Westphal
University of Hamburg
157 Papers
2.2K Citations
Alexander Westphal is an academic researcher from University of Hamburg. The author has contributed to research in topics: Inflation (cosmology) & Moduli. The author has an hindex of 45, co-authored 153 publications. Previous affiliations of Alexander Westphal include Stanford University & International School for Advanced Studies.
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Papers
Monodromy in the CMB: Gravity Waves and String Inflation
TL;DR: In this article, the authors present a simple mechanism for obtaining large-field inflation, and hence a gravitational wave signature, from string theory compactified on twisted tori, yielding predictions for the tilt of the power spectrum and the tensor-to-scalar ratio.
Gravity Waves and Linear Inflation from Axion Monodromy
TL;DR: In this article, a general mechanism for chaotic inflation driven by monodromy-extended closed-string axions is proposed, compatible with moduli stabilization and can be realized in many types of compactifications, including warped Calabi-Yau manifolds and more general Ricci-curved spaces.
1.1K
Quantum states of neutrons in the Earth's gravitational field
Valery Nesvizhevsky,Hans G. Börner,A. K. Petukhov,Hartmut Abele,S. Baeßler,Frank J. Rueß,Thilo Stöferle,Alexander Westphal,A.M Gagarski,Guennady A. Petrov,A. V. Strelkov +10 more
TL;DR: In this article, it was shown that the falling neutrons do not move continuously along the vertical direction, but rather jump from one height to another, as predicted by quantum theory, and the particles are allowed to fall towards a horizontal mirror which, together with the Earth's gravitational field, provides the necessary confining potential well.
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The Powers of Monodromy
TL;DR: In this article, a general overview of the monodromy effect and its application to large-field inflation is presented, with monomial potentials of $mu^{4-p}\phi^p.
269
de Sitter String Vacua from Kahler Uplifting
TL;DR: In this article, a new way to construct de Sitter vacua in type IIB flux compactifications, in which the interplay of the leading perturbative and non-perturbative effects stabilize all moduli in dS vacua at parametrically large volume.
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