from September 29, 2015 to October 2, 2015
DESY Hamburg
Europe/Berlin timezone
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Strings & Mathematical Physics


Location: DESY Hamburg
Address: Notkestrasse 85, 22607 Hamburg
Room: Seminar rooms
Date: from 30 Sep 14:00 to 1 Oct 18:05

Timetable | Contribution List

Displaying 22 contributions out of 22
We study the strong coupling behaviour of 1/4 BPS latitude Wilson loops in N=4 SYM theory, computing the one-loop corrections to the relevant classical string solution in AdS5xS5 in sigma-model perturbation theory. The approach is based on the application of the Gel’fand-Yaglom method to compute the relevant functional determinants for the fluctuations of the type IIB Green-Schwarz action expan ... More
Presented by Mr. Edoardo VESCOVI on 1/10/2015 at 16:05
Two-dimensional gauged linear sigma models with N=(2,2) supersymmetry are a powerful tool for studying the worldsheet theories of type II string compactifications. We construct a certain class of non-Abelian gauged linear sigma models that exhibit an interesting phase structure emerging from non-Abelian strong coupling dynamics. The observed phase structure leads to a duality proposal amongst thes ... More
Presented by Mr. Andreas GERHARDUS on 30/9/2015 at 16:20
We study higher spin currents in the O(N) vector models using analytic conformal bootstrap. For large $N$ we compare the predictions of the bootstrap for anomalous dimensions of higher spin currents against the available perturbative computations. We then generalize to arbitrary loop order. For small $N$ our results can be tested using numerical bootstrap or future experiments.
Presented by Mr. Alexander ZHIBOEDOV on 1/10/2015 at 12:00
We consider six-dimensional supergravity compactified on orbifolds with Wilson lines and flux. Both orbifold singularities and flux lead to chiral fermions in four dimensions. The six-dimensional bulk anomaly, the fixed point anomalies and also the four-dimensional chiral anomaly are cancelled by the Green-Schwarz mechanism. The effective four dimensional theory contains two axions with interestin ... More
Presented by Mr. Markus DIERIGL on 1/10/2015 at 17:05
Session: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
Models of 4D $\mathcal{N}=1$ supergravity coupled to chiral multiplets with vanishing scalar potential have been denoted as no-scale. Of particular interest in the context of string theory are models which additionally possess a shift-symmetry. In this case there exists a dual description of chiral models in terms of real linear multiplets. We classify all shift-symmetric no-scale supergravities i ... More
Presented by David CIUPKE on 30/9/2015 at 17:35
Session: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
Correlation functions of local gauge-invariant operators are natural observables inany conformal quantum field theory. In N=4 SYM a particular role is played by the multipoint supercorrelators of thestress-tensor multiplet. Their chiral truncation in the light-cone limit coincides with the scattering superamplitudes. We propose a novel approach to calculating such correlators based on the L ... More
Presented by Dmitry CHICHERIN on 1/10/2015 at 16:20
Presented by Christoph MAYRHOFER on 30/9/2015 at 12:50
Session: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
I will discuss the effective action of F-theory at order \alpha'^3 from a 12 dimensional perspective. Upon compactification on elliptic Calabi-Yau fourfolds, I will show how the non-trivial vacuum profile for the axio-dilaton leads to a new, genuinely N=1 correction to the 4-dimensional effective action.
Presented by Raffaele SAVELLI on 30/9/2015 at 13:15
Session: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
Solid-on-solid (SOS) models in statistical physics describe the (two-dimensional) interface between two media. To model the shape of the interface we assign a (discrete) height variable to each vertex of a square lattice. The surface tension is taken into account by interactions between these height variables. In case the nearest-neighbouring heights differ by one unit, and the interactions occur ... More
Presented by Jules LAMERS on 30/9/2015 at 17:05
The quantization of the Teichmueller spaces of Riemann surfaces has found important applications to conformal field theory and N=2 supersymmetric gauge theories. The aim of the talk is to construct generalizations of the quantum Teichmueller theory which would, in particular, describe the quantum theory of the Teichmueller spaces of Super-Riemann surfaces. The starting point of the project ... More
Presented by Nezhla AGHAEI on 1/10/2015 at 17:35
Session: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
In this work we consider a set of soft supersymmetry breaking terms within the NMSSM which leads to a small hierarchy between the supersymmetry breaking scale and the electroweak scale. Specifically only the gaugino masses and the soft term in the Higgs sector are non-vanishing at the GUT scale. This pattern can be found in gaugino mediated models and in higher-dimensional orbifold GUTs. We al ... More
Presented by Mrs. Lucila ZÁRATE on 1/10/2015 at 16:35
Natural (axionic) inflation provides a well-motivated and predictive scheme for the description of the early universe. It leads to sizeable primordial tensor modes and thus a high mass scale of the inflationary potential. Naively this seems to be at odds with low (TeV) scale supersymmetry, especially when embedded in string theory. I will outline in the talk that low scale supersymmetry is compati ... More
Presented by Rolf KAPPL on 1/10/2015 at 12:50
Phenomenologically appealing string vacua with either the Standard Model or some GUT spectrum and suitable orders of magnitudes of matter couplings are essential to establish string theory as the framework that unifies all fundamental interactions. I will present here recent results on the quest for such vacua based on Type II string theory with D-branes, and I will discuss their impact on new phy ... More
Presented by Prof. Gabriele HONECKER on 30/9/2015 at 12:00
Non-perturbative aspects of N=2 SUSY gauge theories of class S are encoded in the algebra of functions on the moduli space M-flat of flat SL(N)-connections on Riemann surfaces. Expectation values of Wilson and 't Hooft line operators are related to holonomies of flat connections and, in the low-energy effective theory, to Fock-Goncharov coordinates on M-flat. We determine the non-commutative alg ... More
Presented by Mrs. Ioana COMAN-LOHI on 30/9/2015 at 16:50
Two approaches to heterotic string model building are discussed and compared: first toroidal orbifolds and secondly Calabi-Yau manifolds with line bundle gauge backgrounds.
Presented by Dr. Patrick VAUDREVANGE on 30/9/2015 at 12:25
Session: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
We propose a focus point gauge mediation model based on the product group unification (PGU), which solves the double-triplet splitting problem of the Higgs multiplets. In the focus point gauge mediation, the electroweak symmetry breaking scale can be naturally explained even for multi-TeV stops. It is known that the focus point behavior appears if a ratio of the number of SU(2) doublet messengers ... More
Presented by Dr. Norimi YOKOZAKI on 1/10/2015 at 16:50
Session: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
First I will give a short comparison of topological defects and topological solitons for various space dimensions (D=1,2,3). Then I will discuss properties of 2-dimensional solitons for U(1) gauged easy-axis Heisenberg antiferromagnet, compare these solitons both with 2D Nielsen-Olesen strings in the Abelian Higgs model and with 2D Belavin-Polyakov solitons in isotropic antiferromagnet model - ... More
Presented by Dr. Igor BOGOLUBSKY on 30/9/2015 at 17:20
Session: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
Recently, a model with SO(10) symmetry and bulk flux in 6d was constructed. Anomalies can be canceled and the flux leads to interesting features. Notably, a U(1) flux breaks supersymmetry at a high scale in the matter sector while leaving it intact on gauge and Higgs multiplets. On the other hand, the flux creates a multiplicity for the matter fields while protecting them from symmetry breaking by ... More
Presented by Mr. Julian SCHWEIZER on 1/10/2015 at 17:20
Session: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
We explore a recent proposal of Cosmological Relaxation, by Graham, Kaplan and Rajendran, for generating a hierarchically small Higgs vacuum expectation value. In particular, we discuss its capacity for solving the electroweak hierarchy problem. To do so, we study the dynamics of the model and determine the relation between the fundamental input parameters and the electroweak vacuum expectation va ... More
Presented by Dr. Lukas WITKOWSKI on 1/10/2015 at 13:15
We give an overview on all F-theory fibrations with the 16 classical 2D polytopes as the fiber. These models include Abelian, discrete and quotient symmetries as well as the exact standard model of particle physics that we construct explicitly in four dimensions.
Presented by Paul OEHLMANN on 30/9/2015 at 16:05
The topological string theory partition function captures non-trivial invariants of Calabi-Yau threefolds. In general, target space symmetries acting on the cohomology induce an automorphic structure on the free energies. For non-compact geometries with spectral curve of genus one this allowed to re-express the physical constraints in terms of modular forms. The construction, however, relied on a ... More
Presented by Mr. Thorsten SCHIMANNEK on 30/9/2015 at 16:35
QCD evolution equations in MS-like schemes can be recovered from the same equations in a modified theory, QCD in non-integer d=4−2ϵ dimensions, which enjoys exact scale and conformal invariance at the critical point. Restrictions imposed by the conformal symmetry of the modified theory allow one to obtain complete evolution kernels in integer (physical) dimensions at the given order of perturba ... More
Presented by Dr. Alexander MANASHOV on 1/10/2015 at 12:25
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