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The O(dd) story of massive supergravity
The low energy effective action describing the standard Kaluza-Klein reduction of heterotic string theory on a d-torus possesses a manifest O(d,d+16) symmetry. We consider generalized Scherk-SchwarzExpand
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String Axiverse
String theory suggests the simultaneous presence of many ultralight axions, possibly populating each decade of mass down to the Hubble scale 10−33eV. Conversely the presence of such a plenitude ofExpand
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A Small cosmological constant from a large extra dimension
We propose a new approach to the Cosmological Constant Problem which makes essential use of an extra dimension. A model is presented in which the Standard Model vacuum energy “warps” theExpand
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Duality beyond the first loop
In this article we give a calculation of the two-loop {sigma}-model corrections to the T-duality map in string theory. We use the effective action approach, and analyze two-loop corrections in aExpand
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A natural framework for chaotic inflation.
We show that inflation with a quadratic potential occurs naturally in theories where an axionlike field mixes with a 4-form. Such an axion is massive, with the mass which arises from the mixing beingExpand
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Signatures of short distance physics in the cosmic microwave background
We systematically investigate the effect of short distance physics on the spectrum of temperature anistropies in the Cosmic Microwave Background produced during inflation. We present a generalExpand
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Bent domain walls as brane worlds
We consider domain walls embedded in curved backgrounds as an approximation for braneworld scenarios. We give a large class of new exact solutions, exhausting the possibilities for describing one andExpand
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An ignoble approach to large field inflation
We study an inflationary model developed by Kaloper and Sorbo, in which the inflaton is an axion with a sub-Planckian decay constant, whose potential is generated by mixing with a topological 4-formExpand
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Quantum Black Holes as Holograms in AdS Braneworlds
We propose a new approach for using the AdS/CFT correspondence to study quantum black hole physics. The black holes on a brane in an AdSD+1 braneworld that solve the classical bulk equations areExpand
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String theory and quintessence
We discuss the obstacles for defining a set of observable quantities analogous to an S-matrix which are needed to formulate string theory in an accelerating universe. We show that the quintessenceExpand
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