from September 29, 2015 to October 2, 2015

DESY Hamburg

Europe/Berlin timezone

# Strings & Mathematical Physics

## Place

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

Session:
Strings & Mathematical Physics

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
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Presented by Mr. Edoardo VESCOVI
on
1/10/2015
at
16:05

Session:
Strings & Mathematical Physics

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
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Presented by Mr. Andreas GERHARDUS
on
30/9/2015
at
16:20

Session:
Strings & Mathematical Physics

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

Session:
Strings & Mathematical Physics

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
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Presented by Mr. Markus DIERIGL
on
1/10/2015
at
17:05

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
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Presented by David CIUPKE
on
30/9/2015
at
17:35

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
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Presented by Dmitry CHICHERIN
on
1/10/2015
at
16:20

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

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
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Presented by Jules LAMERS
on
30/9/2015
at
17:05

Session:
Strings & Mathematical Physics

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
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Presented by Nezhla AGHAEI
on
1/10/2015
at
17:35

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
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Presented by Mrs. Lucila ZÁRATE
on
1/10/2015
at
16:35

Session:
Strings & Mathematical Physics

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
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Presented by Rolf KAPPL
on
1/10/2015
at
12:50

Session:
Strings & Mathematical Physics

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
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Presented by Prof. Gabriele HONECKER
on
30/9/2015
at
12:00

Session:
Strings & Mathematical Physics

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
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Presented by Mrs. Ioana COMAN-LOHI
on
30/9/2015
at
16:50

Session:
Strings & Mathematical Physics

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

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
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Presented by Dr. Norimi YOKOZAKI
on
1/10/2015
at
16:50

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 -
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Presented by Dr. Igor BOGOLUBSKY
on
30/9/2015
at
17:20

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
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Presented by Mr. Julian SCHWEIZER
on
1/10/2015
at
17:20

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
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Presented by Dr. Lukas WITKOWSKI
on
1/10/2015
at
13:15

Session:
Strings & Mathematical Physics

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

Session:
Strings & Mathematical Physics

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
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Presented by Mr. Thorsten SCHIMANNEK
on
30/9/2015
at
16:35

Session:
Strings & Mathematical Physics

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
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Presented by Dr. Alexander MANASHOV
on
1/10/2015
at
12:25