Speaker
 Title & Abstract

Senarath (Shanta) de Alwis 
A Minimal Model of Supersymmetry Breaking
A consistent theory of supersymmetry breaking must have a hidden sector an observable sector and must be embedded in a locally supersymmetric theory which arises from string theory. For phenomenological reasons it must also transmit supersymmetry from the hidden to the visible sector in a dominantly flavor neutral manner. Also any such theory of supersymmetry breaking has to take into acount the problem of quadratic divergences which arise once the theory is embedded in supergravity. A model which incorporates all these features with just the bare minimum of necessary supergravity/string theory moduli fields coupled to the minimally supersymmetric standard model, is presented. Every other model has either an extra sector or more finetuning or both. 
Bjorn Andreas 
Stable bundles for heterotic string models
The search for heterotic GUT and standard model vacua has led to various new constructions of stable vector bundles on elliptically respectively K3 fibered CalabiYau threefolds which will be reviewed and discussed. 
Ignatios Antoniadis 
Physics with magnetized branes

Nima ArkaniHamed 

Katrin Becker 
Torsional Heterotic Geometries
We construct some new examples of torsional heterotic backgrounds using duality with orientifold flux compactifications. We then explain how duality provides a solution to the heterotic string Bianchi identity which is an equation of MongeAmpere type. Finally, we propose the existence of a much larger class of compact torsional geometries based on intuition from string duality. 
Melanie Becker 
New Heterotic Flux Compactifications

Massimo Bianchi 
Twists and Shifts
For vacuum configurations with open and unoriented strings, the role of (a) symmetric twists and (non)geometric shifts has not been systematically taken into account so far. We remedy the situation in the perspective of moduli stabilization and susy breaking in combination with other (non)perturbative effects. 
Ralph Blumenhagen 
Multi Dbrane Instanton Effects, String GUT and CC

Lev Borisov 
On CalabiYau varieties with nonabelian fundamental groups of order 64
I will describe the construction (joint with Zheng Hua) of CalabiYaus with large fundamental groups that are obtained as resolutions of complete intersections of four quadrics in P^7. The key ingredient is the use of the holomorphic Lefschetz formula to classify the possible group actions. 
Vincent Bouchard 
The High Country region of the string landscape

Pablo Camara 
Torsion Induced SUSYBreaking Softterms
I discuss the conditions for having noscale solutions of type IIA and IIB supergravity compactified on manifolds of SU(3) structure, where the supersymmetry is spontaneously broken by the intrinsic torsion. The concrete expressions for geometrically induced muterms for D5, D6 and D9branes on twisted tori are presented. Some patterns of soft supersymmetry breaking terms which arise for pure moduli mediation are discussed. 
Michele Cicoli 
General Analysis of LARGE Volume Scenarios with String Loop Moduli Stabilisation
We study the necessary and sufficient topological conditions for general CalabiYaus to get a nonsupersymmetric AdS exponentially large volume minimum of the scalar potential in flux compactifications of IIB string theory. It turns out that string loop corrections play a crucial role to realise exponentially large volume minima for fibration CalabiYaus and to stabilise 4cycles which support chiral matter. The robustness of these results is due to the "extended noscale structure": for arbitrary CalabiYaus, the leading contribution of these corrections to the scalar potential is always vanishing. We use the ColemanWeinberg potential to motivate this cancellation from the viewpoint of lowenergy field theory. We briefly discuss the potential cosmological implications. 
Joe Conlon 
Continuous Global Symmetries in String Theory

Emanuel Diaconescu


Michael Dine 
Symmetries in String Theory

Emilian Dudas 
Multiinstantons and string loop corrections

P. Frampton 
Maldacenainspired phenomenology 
Thomas Grimm 
U(1) Mediation of Fluxed Supersymmetry Breaking
I discuss the mediation of supersymmetry breaking triggered by background fluxes in Type IIB orientifold compactifications with N=1 supersymmetry. For compactifications on nonKaehler backgrounds the mediation can arise due to an U(1) vector multiplet coupling to both a hidden supersymmetry breaking flux sector and a visible brane sector. I will discuss the construction of the required orientifolds with candidate local geometries for the hidden and visible sector. The computation of the relevant BPS invariants confirms the topological connection between the two sectors. 
Mark Gross 
Some CalabiYau manifolds with small Betti numbers.
I will discuss a number of example of CalabiYau threefolds with small Betti numbers and large fundamental group which may be useful for string compactifications.
Many of these examples were discovered with Sorin Popescu, and are fibred in abelian surfaces. One of the examples has h^{1,1}=h^{1,2}=2 and fundamental group
Z_8 x Z_8 
Monika Gabriele Honecker 
Towards the supersymmetric standard model on intersecting branes  the Z6' case
Intersecting D6branes on orbifold backgrounds provide calculable tools for four dimensional lowenergy spectra and couplings. The abundance of phenomenologically appealing spectra, in particular those close to the MSSM, is strongly background dependent. In this talk, I will mainly focus on a fertile region, the Z6' orbifold. (and compare it with other orbifolds if time permits) 
Elias Kiritsis 
Getting the Standard Model from freefield Orientifolds

Igor Klebanov 
Warped Conifolds and Their Applications to Cosmology

Maximilian Kreuzer 
Constructing CalabiYau 3folds and their mirrors via conifold transitions
A surprisingly large class of new CalabiYau 3folds with small Picard numbers and their mirrors can be constructed by conifold transitions from toric hypersurfaces, generalizing the mirror construction of CalabiYau complete intersections in Grassmannians and flag manifolds. I'll describe our recent results with Batyrev and also summarize work on torsion in cohomology for hypersurfaces and complete intersections as well as phenomenological applications. 
Bumseok Kyae 
Orbifold SUSY GUT from the Heterotic String
From the string partition function, we derive the massshell and GSO projection conditions valid for KaluzaKlein (KK) as well as massless states in the heterotic string theory compactified on a nonprime orbifold. Using the obtained conditions we construct a 4D string standard model, which is embedded in a 6D SUSY GUT by including KK states above the compactification scale. We discuss the stringy threshold corrections to gauge couplings, which include the Wilson line effects. We point out the differences in string and field theoretic orbifoldings.

Zygmunt Lalak 
Gravity in Gauge Mediation
Usually gauge mediation of supersymmetry breaking is discussed independently of the structure of the microscopic sector which is responsible for supersymmetry breakdown. We shall discuss in specific models how the internal structure of that sector determines the structure and scales of the supersymmetry breaking terms. We demonstrate the role of supergravity induced corrections to the scalar potential, in particular the constraints imposed by the cancellation of the cosmological constant. We include moduli into the discussion 
Louis Leblond 
Inflation from Wrapped Branes
In brane inflation models, the field range in Planck units for the inflaton is geometrically limited and this imposes strong constraints in model building. In this talk I will discuss how one can extend the field range by using higher dimensional wrapped branes. I will discuss in details a possible scenario where a D5brane falls down a throat and selfannihilate. DBI inflation could be realized in this setup with a strong nonGaussian signal. 
Tao Liu 
Dynamically Solving mu/Bmu Problem in Gaugemediated SUSY Breaking

Dieter Luest 
Supersymmetric, nonsupersymmetric and inflationary type II string vacua
We discuss type II orientifold compactifications on generalized geometries with and without supersymmetry. In addition we also discuss a particular inflationary string model which leads to specific astrophysical observables. 
Juan Maldacena 
Conformal Collider Physics
We discuss energy correlations as infrared finite observables in conformal field theories. We discuss an application of the lightcone operator product expansion for determining the small angle singularities of the energy correlations. We analyze this at both weak and strong coupling. We also discuss general properties of energy correlation functions. 
Fernando Marchesano 
Nonperturbative Fterms across stability lines

Jock McOrist 
Type IIB Flux Vacua from the String Worldsheet
In this talk I will present recent progress towards understanding d=4 Minkowski flux vacua using string worldsheet techniques. In a simple class of examples I will show how to derive spacetime warping and the GukovVafaWitten superpotential for complex structure moduli. 
Ilarion Melnikov 
Linear Sigma Models and (0,2) Mirror Symmetry
I will discuss some recent progress on computing Yukawa couplings in (0,2) Heterotic theories obtained as IR limits of deformed (2,2) gauged linear sigma models. I will show that the combination of the linear structure and the existence of a related halftwisted sigma model render these couplings computable in terms of the parameters of the linear model. Finally, I will comment on the Implications of these computations for (0,2) mirror symmetry. 
David Morrison

Limitations of Geometric Engineering: Implications for Model Building

Slava Mukhanov 
Inflation and CMB fluctuations

Yu Nakayama 
Moduli stabilization in stringy ISS model
We present a stringy realization of the ISS metastable SUSY breaking model with moduli stabilization. The mass moduli of the ISS model is stabilized by gauging of a U(1) symmetry and its Dterm potential. The SUSY is broken both by Fterms and Dterms. It is possible to obtain deSitter vacua with a vanishingly small cosmological constant by an appropriate finetuning of flux parameters. 
Pran Nath 
A New Path to SO(10) Unification and Proton Decay

Stefan Groot Nibbelink 
Heterotic Model Building on Orbifold Resolutions
Heterotic string on orbifolds give an easy insight of the possible phenomenological models that could come out of string theory. In particular recently it has been shown that it is possible to get a rather large class of models that have exactly the MSSM spectrum up to states that do not directly couple to the SM gauge group. Unfortunately orbifolds only define very special points in moduli space, to obtain a more complete picture of heterotic phenomenology one also has to investigate on smooth CalabiYaus. We construct such spaces as blowups of orbifolds with Abelian gauge bundle backgrounds, and make a start in investigating the properties of the resulting models. 
Hans Peter Nilles 
The Gaugino Code
Gauginos may play a crucial role in the search for supersymmetry at the Large Hadron Collider (LHC). Mass predictions for gauginos are rather robust and often related to the values of the gauge couplings. We analyse the ratios of gaugino masses in the LHC range for various schemes of supersymmetry breakdown and mediation in the framework of string inspired models. Three distinct mass patterns emerge. 
Erik Plauschinn 
Moduli Stabilisation versus Chirality
In this talk, the general question of implementing a chiral MSSM like Dbrane sector in Type IIB orientifold models together with complete moduli stabilisation via Fterms induced by fluxes and spacetime instantons is analysed. It turns out that in principle this is not possible and Dterms have to be taken into account. For a concrete model on P_[1,3,3,3,5][15] such a mechanism is illustrated. 
Fernando Quevedo 
LARGE volume string scenarios

Michael Ratz 
MSSMs from Heterotic Orbifolds
Recent progress in embedding the standard model in string theory is described.
Models with the following features are discussed: (i) exact MSSM spectrum below the unification scale; (ii) R parity; (iii) hierarchical Yukawa couplings with nontrivial mixing; (iv) solution to the mu problem; (v) seesaw suppressed neutrino masses. Potential problems with dimension five proton decay are also commented on. 
MasaHiko Saito 
A CalabiYau threefold with abelian fibration and Z/2Zaction
We will report on a new example of CalabiYau threefold with a fibration of Jacobians of curves of genus $2$ with Z/2Z action which may be useful for string compactifications.

Bert Schellekens 
Nonsupersymmetric Gepner orientifolds

Michael Schulz 
String Junctions, Abelian Fibrations and Flux/Geometry Duality
In previous work, it was argued that the type IIB T^6/Z_2 orientifold with a choice of flux preserving N=2 supersymmetry is dual to a class of purely geometric type IIA compactifications on abelian surface (T^4) fibered CalabiYau threefolds. In this talk, I will provide two concrete descriptions of the resulting CalabiYau duals. The first is a monodromy based description, analogous to Ftheory encoding of CalabiYau geometry via 7branes and string junctions, except for T^4 rather than T^2 fibers. The second is an explicit algebrogeometric construction in which the T^4 fibers arise as the Jacobian tori of a family genus2 curves. The talk will conclude with a discussion of applications of this work, including applications to Dbrane instantons and D(imensional) duality. 
Nathan Seiberg

Gauge mediation of SUSY breaking

Savdeep Sethi 
NonSupersymmetric String Theory

Qaisar Shafi 
Higgs Mass Bounds in the light of Neutrino Oscillations
An understanding of the observed solar and atmospheric neutrino oscillations requires new physics beyond the Standard Model (SM). We discuss how this new physics also modifies the vacuum stability and perturbativity bounds on the SM Higgs mass. 
Sarah Shandera 
Testing stringy nonGaussianity
NonGaussianity may be a powerful means to distinguish between inflationary models. It is a particularly interesting probe since it may well be sensitive to UV physics and is observable in the near future. Some string theory models of inflation that predict observably large nonGaussianity also predict that the magnitude of nonGaussianity grows on small scales, and so may be tested with large scale structure measurements, including cluster number counts. This talk will explore a few theoretical and observational implications of scaledependent nonGaussianity. 
Jing Shao 
Solving the moduli and dark matter problem in the G_2 MSSM scenario
We address the cosmological moduli/gravitino problems and the issue of too little thermal but excessive nonthermal dark matter from the decays of moduli in a phenomenological scenario motivated from G2 compacification with moduli stabilized. 
Gary Shiu 
Progress in Warped String Compactifications
Warped compactifications have found interesting applications in cosmology and particle physics. Describing these backgrounds is also conceptually challenging. In this talk, I will describe some recent work on understanding warped string vacua as well as the effective theory describing them. 
Eva Silverstein 
Monodromy in the CMB: Gravity Waves and String Inflation

Paul Steinhardt 
Dark Energy Theorems and Other Curious Corollaries

Balazs Szendroi 
Quivers, Dimers and Noncommutative DonaldsonThomas Invariants
Certain limits of local CalabiYau threefolds are well known to be described by quiver theories, which in turn can be combinatorially defined by the associated dimer model. I will explain how this gives rise to noncommutative analogues of DT invariants, integer invariants closely related to BPS state counting, and how their generating functions can in some cases be computed in closed form, exhibiting wallcrossing behaviour. 
Gonzalo Torroba 
Kinetic terms in string compactifications
We develop a general formalism to construct the kinetic terms of the low energy degrees of freedom in string compactifications. It is shown that the correct 4d fields arise from fluctuations satisfying a (warped) generalization of the harmonic gauge in CalabiYau manifolds. This simplifies considerably the dimensional reduction, enabling us to find explicitly the field space metric. The method is then applied to warped flux compactifications. 
LiSheng Tseng 
Orbifold and local heterotic flux geometry.
presented with ShingTung Yau 
Henry Tye

Mobility in the Cosmic Landscape

Cumrun Vafa 
Ftheory and GUTs: Experimental Predictions

Herman Verlinde 

Liantao Wang 
Zprime Mediated supersymmetry Breaking.

Taizan Watari 
HeteroticF Theory Duality Revisited
[based on an article arXiv:0805.1057] Ftheory is a better framework than the perturbative Type IIB string theory, when it comes to describe Yukawa couplings of quarks and leptons. How should quarks and leptons be described in Ftheory? I would like to talk about recent progress on this issue that was not covered by DonagiWijnholt or BeaseleyHeckmanVafa. Covering matter curves and chirality formulae will be the main theme of the talk. 
Alexander Westphal 
Monodromy in the CMB: Gravity Waves and String Inflation
We present a simple mechanism for obtaining largefield inflation, and hence a gravitational wave signature, from string theory compactified on twisted tori. For Nil manifolds, we obtain a leading inflationary potential proportional to phi^(2/3) in terms of the canonically normalized field phi, yielding predictions for the tilt of the power spectrum and the tensortoscalar ratio, $n_s\approx 0.98$ and $r\approx 0.04$ with 60 efoldings of inflation; we note also the possibility of a variant with a candidate inflaton potential proportional to phi^(2/5). The basic mechanism involved in extending the field range  monodromy in Dbranes as they move in circles on the manifold  arises in a more general class of compactifications, though our methods for controlling the corrections to the slowroll parameters require additional symmetries. We will also discuss closed string versions of our monodromy mechanism in the context of IIB fluxed CalabiYau compactifications a
la GKPKKLT. 
Martijn Wijnholt 
Breaking GUTsin FTheory

ShingTung Yau 
Orbifold and local heterotic flux geometry.
presented with LiSheng Tseng 