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Largevolume flux compactifications: Moduli spectrum and D3/D7 soft supersymmetry breaking
 SYSTEMATICS OF MODULI STABILISATION IN CALABIYAU FLUX COMPACTIFICATIONS,” JHEP 0503 (2005) 007 [ARXIV:HEPTH/0502058]. – 42
, 2005
"... We present an explicit calculation of the spectrum of a general class of string models, corresponding to CalabiYau flux compactifications with h1,2> h1,1> 1 with leading perturbative and nonperturbative corrections, in which all geometric moduli are stabilised as in hepth/0502058. The volum ..."
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Cited by 129 (20 self)
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We present an explicit calculation of the spectrum of a general class of string models, corresponding to CalabiYau flux compactifications with h1,2> h1,1> 1 with leading perturbative and nonperturbative corrections, in which all geometric moduli are stabilised as in hepth/0502058. The volume is exponentially large, leading to a range of string scales from the Planck mass to the TeV scale, realising for the first time the large extra dimensions scenario in string theory. We provide a general analysis of the relevance of perturbative and nonperturbative effects and the regime of validity of the effective field theory. We compute the spectrum in the moduli sector finding a hierarchy of masses depending on inverse powers of the volume. We also compute soft supersymmetry breaking terms for particles living on D3 and D7 branes. We find a hierarchy of soft terms corresponding to ‘volume dominated ’ Fterm supersymmetry breaking. Fterms for Kähler moduli dominate both those for dilaton and complex
Towards inflation in string theory
 JCAP
, 2003
"... We investigate the embedding of brane inflation into stable compactifications of string theory. At first sight a warped compactification geometry seems to produce a naturally flat inflaton potential, evading one wellknown difficulty of braneantibrane scenarios. Careful consideration of the closed ..."
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Cited by 82 (9 self)
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We investigate the embedding of brane inflation into stable compactifications of string theory. At first sight a warped compactification geometry seems to produce a naturally flat inflaton potential, evading one wellknown difficulty of braneantibrane scenarios. Careful consideration of the closed string moduli reveals a further obstacle: superpotential stabilization of the compactification volume typically modifies the inflaton potential and renders it too steep for inflation. We discuss the nongeneric conditions under which this problem does not arise. We conclude that brane inflation models can only work if restrictive assumptions about the method of volume stabilization, the warping of the internal space, and the source of inflationary energy are satisfied. We argue that this may not be a real problem, given the large range of available fluxes and background geometries in string theory.
Dynamics of warped compactifications and the shape of the warped landscape
, 2005
"... The dynamics of warped/flux compactifications is studied, including warping effects, providing a firmer footing for investigation of the “landscape.” We present a general formula for the fourdimensional potential of warped compactifications in terms of tendimensional quantities. This allows a syste ..."
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Cited by 77 (2 self)
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The dynamics of warped/flux compactifications is studied, including warping effects, providing a firmer footing for investigation of the “landscape.” We present a general formula for the fourdimensional potential of warped compactifications in terms of tendimensional quantities. This allows a systematic investigation of modulifixing effects and potentials for mobile branes. We provide a necessary criterion, “slopedominance, ” for evading “nogo ” results for de Sitter vacua. We outline the tendimensional derivation of the nonperturbative effects that should accomplish this in KKLT examples, and outline a systematic discussion of their corrections. We show that potentials for mobile branes receive generic contributions inhibiting slowroll inflation. We give a linearized analysis of general scalar perturbations of warped IIB compactifications, revealing new features for both time independent and dependent moduli, and new aspects of the kinetic part of the fourdimensional effective action. The universal Kahler modulus is found not to be a simple scaling of the internal metric, and a prescription is given for defining holomorphic Kahler moduli, including warping effects. In the presence of mobile branes, this
Inflation from warped space
 JHEP
, 2005
"... A long period of inflation can be triggered when the inflaton is held up on the top of a steep potential by the infrared end of a warped space. We first study the field theory description of such a model. We then embed it in the flux stabilized string compactification. Some special effects in the th ..."
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Cited by 38 (8 self)
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A long period of inflation can be triggered when the inflaton is held up on the top of a steep potential by the infrared end of a warped space. We first study the field theory description of such a model. We then embed it in the flux stabilized string compactification. Some special effects in the throat reheating process by relativistic branes are discussed. We put all these ingredients into a multithroat brane inflationary scenario. The resulting cosmic string tension Inflation [1–3] provides a natural mechanism for creating the homogeneity and flatness of our observable universe. It also gives an elegant way of generating the perturbations [4–10] which seed the structure formation. In order for the inflation to last sufficiently long and then successfully exit to reheat the universe, the inflaton has to be held up on a potential for
Closer towards inflation in string theory,” Phys
 Inflation in realistic Dbrane models,” JHEP 0409, 033 (2004), hepth/0403119 ; A. Buchel
, 2004
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The giant inflaton
, 2002
"... We investigate a new mechanism for realizing slow roll inflation in string theory, based on the dynamics of p antiD3 branes in a class of mildly warped flux compactifications. Attracted to the bottom of a warped conifold throat, the antibranes then cluster due to a novel mechanism wherein the back ..."
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Cited by 30 (5 self)
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We investigate a new mechanism for realizing slow roll inflation in string theory, based on the dynamics of p antiD3 branes in a class of mildly warped flux compactifications. Attracted to the bottom of a warped conifold throat, the antibranes then cluster due to a novel mechanism wherein the background flux polarizes in an attempt to screen them. Once they are sufficiently close, the M units of flux cause the antibranes to expand into a fuzzy NS5brane, which for rather generic choices of p/M will unwrap around the geometry, decaying into D3branes via a classical process. We find that the effective potential governing this evolution possesses several epochs that can potentially support slowroll inflation, provided the process can be arranged to take place at a high enough energy scale, of about one or two orders of magnitude below the Planck energy; this scale, however, lies just outside the bounds of our approximations
Dterms and Fterms from D7brane fluxes
, 2005
"... Using a KaluzaKlein reduction of the fermionic part of the Dbrane action we compute D and Fterms of the N = 1 effective action for generic CalabiYau orientifold compactifications in the presence of a spacetime filling D7brane. We include nontrivial background fluxes for the D7brane U(1) fie ..."
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Cited by 20 (2 self)
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Using a KaluzaKlein reduction of the fermionic part of the Dbrane action we compute D and Fterms of the N = 1 effective action for generic CalabiYau orientifold compactifications in the presence of a spacetime filling D7brane. We include nontrivial background fluxes for the D7brane U(1) field strength on the internal fourcycle wrapped by the brane. First the fourdimensional fermionic spectrum arising from the D7brane is derived and then the D and Fterms are obtained by computing appropriate couplings of these fermionic fields. For specific examples we examine the resulting fluxinduced scalar potentials and comment on their relevance in string cosmology.