Oscillations in the CMB from Axion Monodromy Inflation (2009)
Flauger, Raphael, McAllister, Liam, Pajer, Enrico, Westphal, Alexander, Xu, Gang
We study the CMB observables in axion monodromy inflation. These well-motivated scenarios for inflation in string theory have monomial potentials over super-Planckian field ranges, with superimposed...
Gravity Waves and Linear Inflation from Axion Monodromy (2008)
McAllister, Liam, Silverstein, Eva, Westphal, Alexander
Wrapped branes in string compactifications introduce a monodromy that extends the field range of individual closed-string axions to beyond the Planck scale. Furthermore, approximate shift symmetries...
Monodromy in the CMB: Gravity Waves and String Inflation (2008)
Silverstein, Eva, Westphal, Alexander
We present a simple mechanism for obtaining large-field inflation, and hence a gravitational wave signature, from string theory compactified on twisted tori. For Nil manifolds, we obtain a leading...
Accidental Inflation in String Theory (2007)
Linde, Andrei, Westphal, Alexander
We show that inflation in type IIB string theory driven by the volume modulus can be realized in the context of the racetrack-based Kallosh-Linde model (KL) of moduli stabilization. Inflation here...
Quantum motion of a neutron in a waveguide in the gravitational field (2007)
Voronin, Alexei Yu., Abele, H., Baessler, S., Nesvizhevsky, V.V., Petukhov, A.K., Protasov, K.V., ...
We study theoretically the quantum motion of a neutron in a horizontal wave-guide in the gravitational field of the Earth. The wave-guide in question is equipped with a mirror below and a rough...
Moduli stabilization in meta-stable heterotic supergravity vacua (2007)
Serone, Marco, Westphal, Alexander
We revisit the issue of moduli stabilization in a class of N=1 four dimensional supergravity theories which are low energy descriptions of standard perturbative heterotic string vacua compactified on...
Moduli Stabilization in Meta-Stable Heterotic Supergravity Vacua (2007)
Serone, Marco, Westphal, Alexander
We revisit the issue of moduli stabilization in a class of N=1 four dimensional supergravity theories which are low energy descriptions of standard perturbative heterotic string vacua compactified on...
Lifetime of Stringy de Sitter Vacua (2007)
In this note we perform a synopsis of the life-times from vacuum decay of several de Sitter vacuum constructions in string/M-theory which have a single dS minimum arising from lifting a pre-existing...
Lifetime of Stringy de Sitter Vacua (2007)
In this note we perform a synopsis of the life-times from vacuum decay of several de Sitter vacuum constructions in string/M-theory which have a single dS minimum arising from lifting a pre-existing...
Westphal, Alexander, Abele, Hartmut, Baessler, Stefan
Recently, quantum states of ultra-cold neutrons in the Earth's gravitational field have been observed for the first time. From the fact that they are consistent with Newtonian gravity on the 10...
Consistent de Sitter String Vacua from Kahler Stabilization and D-term uplifting (2007)
Parameswaran, Susha L., Westphal, Alexander
In this note, we review our construction of de Sitter vacua in type IIB flux compactifications, in which moduli stabilization and D-term uplifting can be combined consistently with the supergravity...
Consistent de Sitter String Vacua from Kahler Stabilization and D-term uplifting (2007)
Parameswaran, Susha L., Westphal, Alexander
In this note, we review our construction of de Sitter vacua in type IIB flux compactifications, in which moduli stabilization and D-term uplifting can be combined consistently with the supergravity...
de Sitter String Vacua from Kahler Uplifting (2006)
We present 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...
de Sitter String Vacua from Kahler Uplifting (2006)
We present 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...
de Sitter String Vacua from Perturbative Kahler Corrections and Consistent D-terms (2006)
Parameswaran, Susha L., Westphal, Alexander
We present a new way to construct de Sitter vacua in type IIB flux compactifications, in which moduli stabilization and D-term uplifting can be combined in a manner consistent with the supergravity...
de Sitter String Vacua from Perturbative Kahler Corrections and Consistent D-terms (2006)
Parameswaran, Susha L., Westphal, Alexander
We present a new way to construct de Sitter vacua in type IIB flux compactifications, in which moduli stabilization and D-term uplifting can be combined in a manner consistent with the supergravity...
Westphal, Alexander, Abele, H., Baessler, S., Nesvizhevsky, V. V., Petukhov, A. K., Protasov, K. V., ...
Quantum states in the Earth's gravitational field were observed, when ultra-cold neutrons fall under gravity. The experimental results can be described by the quantum mechanical scattering model as...
Eternal Inflation with alpha'-Corrections (2005)
Higher-order alpha'-corrections are a generic feature of type IIB string compactifications. In KKLT-like models of moduli stabilization they provide a mechanism of breaking the no-scale structure of...
Higher-dimension operators in higher-dimensional field theories / (2005)
Zugl.: Hamburg, Univ., Diss., 2005.
Abele, Hartmut, Baessler, Stefan, Westphal, Alexander
Quantum states in the Earth's gravitational field can be observed, when ultra-cold neutrons fall under gravity. In an experiment at the Institut Laue-Langevin in Grenoble, neutrons are reflected and...
Zugl.: Berlin, Techn. Universiẗat, Diss., 1996.
Über Encephalopathia saturnina / (1888)
Thesis (doctoral)--Friedrich-Wilhelms-Universität zu Berlin, 1888.