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**11 - 17**of**17**### Flux–induced Soft Supersymmetry Breaking in Chiral Type IIB Orientifolds with D3/D7–Branes

, 2004

"... We discuss supersymmetry breaking via 3–form fluxes in chiral supersymmetric type IIB orientifold vacua with D3 – and D7–branes. After a general discussion of possible choices of fluxes allowing for stabilizing of a part of the moduli, we determine the resulting effective action including all soft s ..."

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We discuss supersymmetry breaking via 3–form fluxes in chiral supersymmetric type IIB orientifold vacua with D3 – and D7–branes. After a general discussion of possible choices of fluxes allowing for stabilizing of a part of the moduli, we determine the resulting effective action including all soft supersymmetry breaking terms. We also extend the computation of our previous work [1] concerning the matter field metrics arising from various open string sectors, in particular focusing on the 1/2 BPS D3/D7–brane configuration. Afterwards, the F–theory lift of our constructions is investigated

### NSF-ITP-02-71

, 2002

"... hep-th/0208123 Scales and hierarchies in warped compactifications and brane worlds ..."

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hep-th/0208123 Scales and hierarchies in warped compactifications and brane worlds

### UM-TH-00-15 Imperial/TP/99-0/33 hep-th/0007120 A supersymmetric Type IIB Randall-Sundrum realization

, 2000

"... We show that an earlier domain wall solution of type IIB supergravity provides a supersymmetric realization of the Randall-Sundrum brane-world, and give its ten-dimensional interpretation in terms of IIB 3-branes. We also explain how previous no-go theorems are circumvented. In particular, whereas D ..."

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We show that an earlier domain wall solution of type IIB supergravity provides a supersymmetric realization of the Randall-Sundrum brane-world, and give its ten-dimensional interpretation in terms of IIB 3-branes. We also explain how previous no-go theorems are circumvented. In particular, whereas D = 5 supergravity scalars have AdS5 energy E0 ≤ 4 and are unable to support a D = 5 positive tension brane, our scalar has E0 = 8, and is the breathing mode of the S 5 compactification. Another essential element of the construction is the implementation of a Z2 symmetry by patching together compactifications with opposite signs for their 5-form field strengths. This is thus a IIB analogue of a previous D = 5 3-brane realization of the Hoˇrava-Witten orbifold. A mode-locking phenomenon avoids the appearance of negative energy zero-modes in spite of the necessity of a D = 10 negative tension brane-source. 1

### CERN-TH/2000-176 hep-th/0006204 Stringy World Branes and Exponential Hierarchies

, 2000

"... We describe heterotic string and M-theory realizations of the Randall-Sundrum (RS) scenario with N = 2 and N = 1 supersymmetry in the bulk. Supersymmetry can be broken only on the world brane, a scenario that has been proposed to account for the smallness of the cosmological constant. An interesting ..."

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We describe heterotic string and M-theory realizations of the Randall-Sundrum (RS) scenario with N = 2 and N = 1 supersymmetry in the bulk. Supersymmetry can be broken only on the world brane, a scenario that has been proposed to account for the smallness of the cosmological constant. An interesting prediction from string duality is the generation of a warp factor for conventional type II Calabi–Yau 3-fold compactifications. On the other hand we argue that an assumption that is needed in the RS explanation of the hierarchy is hard to satisfy in the string theory context.

### and the Non-existence of Horizons in 5d Gravity-Scalar System

, 2000

"... We present an exact thick domain wall solution with naked singularities to five dimensional gravity coupled with a scalar field with exponential potential. In our solution we found exactly the special coefficient of the exponent as coming from compactification of string theory with cosmological cons ..."

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We present an exact thick domain wall solution with naked singularities to five dimensional gravity coupled with a scalar field with exponential potential. In our solution we found exactly the special coefficient of the exponent as coming from compactification of string theory with cosmological constant. We show that this solution is self-tuning when a 3-brane is included. In searching for solution with horizon we found a similar exact solution with fine-tuned exponent coefficient with an integration constant. Failed to find a solution with horizon we prove the non-existence of horizons. These naked singularities actually can’t be resolved by horizon. We also comment on the physical relevance of this solution.

### hep-th/0404151

, 2004

"... We discuss various realizations of the four dimensional braneworld inflation in warped geometries of string theory. In all models the inflaton field is represented by a Dp probe brane scalar specifying its position in the warped throat of the compactification manifold. We study existing inflationary ..."

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We discuss various realizations of the four dimensional braneworld inflation in warped geometries of string theory. In all models the inflaton field is represented by a Dp probe brane scalar specifying its position in the warped throat of the compactification manifold. We study existing inflationary throat local geometries, and construct a new example. The inflationary brane is either a D3- or a D5-brane of type IIB string theory. In the latter case the inflationary brane is wrapping a two-cycle of the compactification manifold. We discuss some phenomenological aspects of the model where slow-roll conditions are under computational control. Inflation [1–3] is an attractive scenario which solves many important problems in cosmology. The basic idea of its simplest realization is that our Universe went through the stage of the accelerated expansion driven by the potential energy of the slowly rolling inflaton field. In agreement with current observational data such a model naturally predicts