6-10 March 2017
Mainz Institute for Theoretical Physics, Johannes Gutenberg University
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Feynman integrals are one of the most important tools of pertubation theory for high precision calculations in particle physics. Due to the presence of ultraviolet or infrared divergences these integrals may require regularisation where the dimensional regularisation is commonly used (the regularisation parameter ε denotes the deviation from the number of space-time dimensions). The result for a ... More
Presented by Luise ADAMS on 9 Mar 2017 at 14:45
The mathematics of Calabi-Yau spaces plays a crucial role in the context of string compactifications. In this talk I discuss the gauged linear sigma model (GLSM), which is a supersymmetric gauge theory in two dimensions that encodes information about Calabi-Yaus and their moduli spaces. After a basic introduction to GLSMs, I will discuss new methods for computing quantum corrections in string ... More
Presented by Johanna KNAPP on 7 Mar 2017 at 09:30
We present recent developments in F-theory compactifications and focus on advances in constructions of globally consistent F-theory compactifications with Abelian and discrete gauge symmetries, emphasizing technical advances and insights into higher-rank gauge symmetries. We also present recent studies of the origin of Abelian and discrete symmetries in Heterotic/F-theory duality.
Presented by Mirjam CVETIC on 10 Mar 2017 at 11:30
We study the non-perturbative behaviour of superconformal gauge theories with rigid N=2 supersymmetry in four dimensions, in particular N=2* theories, and discuss the relation between their S-duality properties and the possibility of computing exact quantum observables. For these theories in fact, the prepotential function, that encodes the low-energy effective dynamics on the Coulomb branch of mo ... More
Presented by Marialuisa FRAU on 7 Mar 2017 at 14:00
Enumerative geometry is an old subject with roots in the 19th century whose aim is to count the number of geometric objects of a certain type that satisfy given conditions. Advances in both mathematics, and unexpectedly, mathematical physics have led to the resolution of many of its conjectures and have highlighted new deep connections between mathematics and string theory. In this talk I ... More
Presented by Mara UNGUREANU on 9 Mar 2017 at 14:00
Presented by Michela PETRINI on 6 Mar 2017 at 15:15
We explain how the concept of a lattice gauge theory with values in a group can be generalised to a gauge theory with values in a Hopf algebra on a graph embedded into a surface. We give an axiomatic description of Hopf algebra gauge theories and show that they include the quantum algebra of observables obtained by the combinatorial quantisation of Chern-Simons theory as an example. We relate Ho ... More
Presented by Catherine MEUSBURGER on 8 Mar 2017 at 09:00
The aim of quantum field theory (QFT) is to unify quantum theory with the principles of relativity. The problem of a consistent mathematical description, beyond the level of formal perturbation theory, is still open to date, in particular for many physically interesting models describing interaction among relativistic particles. One mathematical framework for the description of QFT on Minkowski sp ... More
Presented by Daniela CADAMURO on 8 Mar 2017 at 11:00
I will discuss the moduli of heterotic compactifications on seven-dimensional manifolds with G2 structure with instanton bundles. I will also discuss how such compactifications can be used for model building in string theory.
Presented by Magdalena LARFORS on 7 Mar 2017 at 14:45
I review the geometry of heterotic string compactifications leading to supersymmetric gauge theories in 4 and 3 dimensions. The data of these compactifications are specified by a quadruple (Y, V, TY, H) where X is a 6 or 7 dimensional manifold with a G-sturcture (a certain SU(3) structure in 6 dimensions or an integrable G2 structure in 7), V is a vector bundle over X with a Yang Mills connecti ... More
Presented by Xenia DE LA OSSA on 6 Mar 2017 at 11:30
In this talk, I give a different graphical representatioin (unrelated to Feynman diagrams) for the numbers that arise as amplitude calculations in QFTs, i.e. mixed Tate motives. The graphs in this talk are chosen to better illuminate the symmetries underlying the mixed Tate motives themselves, with the eventual goal of understanding their structure.
Presented by Susama AGARWALA on 10 Mar 2017 at 10:15
Transport and deposition of asbestos-fibers are strongly affected by their diameter and aspect ratio, airflow condition, and the airway morphology. Very few prior works resolved the full motion of nano-scale fibers where the Brownian diffusion is dominant. In this work, the transport and deposition of nano-fibers were numerically simulated in a physiologically realistic lung bifurcation model. Det ... More
Presented by Sarita SINGH
I will set the stage for and explain what periods of Feynman graphs are and why they should be interesting both to mathematicians and physicists. From there I will focus on some graph theoretic tools for understanding the resulting number and their symmetries.
Presented by Karen YEATS on 9 Mar 2017 at 09:00
String theory remains to date our best framework to construct a quantum theory that unifies gravity and the other three fundamental forces of Nature. Although it has emerged as a fantastic arena in which mathematics and physics ideas constantly cross-fertilize, its credibility relies on the power of its testable predictions. In this talk, I will review progress made since the defining work o ... More
Presented by Anne TAORMINA on 6 Mar 2017 at 09:30
In this talk we give a brief review on the conceptual and mathematical framework underlying loop quantum gravity with a focus on its dynamics encoded in the so called quantum Einstein equations. We will discuss how the notion of Dirac observables in the context of general relativity can be used to derive a reduced phase space quantization for loop quantum gravity. Furthermore, we explain how the q ... More
Presented by Kristina GIESEL on 8 Mar 2017 at 14:00
I will discuss the physical context in which amplitude calculations are required and describe some techniques in active development. I focus particularly on singularities and discontinuities as key tools for exploration and computation. I will describe their physical interpretations and ways to embed them in algebraic frameworks which can aid in constructing the full amplitudes.
Presented by Ruth BRITTO on 9 Mar 2017 at 11:00
I will discuss various aspects of the mathematics and the physics, especially of F-theory compactifications, on Calabi-Yau threefolds with singularities.
Presented by Antonella GRASSI on 7 Mar 2017 at 11:30
Compactifications on manifolds whose size is of the order of the string length reveal purely stringy phenomena such as very light modes corresponding to strings winding around the space. As a consequence, the usual low-energy description of string compactifications given by field theory breaks down. In this talk I will review the basic features of compactifications on tori of string size, and ... More
Presented by Mariana GRANA on 6 Mar 2017 at 14:30
on 6 Mar 2017 at 09:15
Am 11. Februar 2016 haben die Wissenschaftler der internationalen LIGO-Kollaboration bekannt gegeben, dass sie die ersten Gravitationswellen beobachtet haben. Ihre Quelle bestand aus zwei sich umkreisenden schwarzen Löchern mit 29 bzw. 36 mal so viel Masse wie unsere Sonne, die zu einem einzigen schwarzen Loch mit 62 Sonnenmassen verschmolzen sind. Die übrigen 3 Sonnenmassen waren in Gravitation ... More
Presented by Anda DEGERATU
String sigma-models relevant in the AdS/CFT correspondence are highly non-trivial two-dimensional field theories, for which predictions at finite coupling assume integrability and/or the correspondence itself. After having discussed general features of the perturbative approach, I will present progress on how to extract finite coupling information via the use of lattice f ... More
Presented by Valentina FORINI on 8 Mar 2017 at 14:45