EPS HEP 2015

Session

Non-Perturbative Field Theory and String Theory

10

25 Jul 2015, 09:00

401. Recent Progress on the Gauge Theory Sector of F-Theory

Dr Denis Klevers (CERN)

25/07/2015, 09:00

Non-Perturbative Field Theory and String Theory

talk

F-theory provides a geometric framework for engineering non-perturbation string vacua that have proven fruitful for the construction of GUT models for particle phenomenology. Its power in reliably extracting the physics of the strongly coupled string theory relies on the power of algebraic geometry. F-theory provides a dictionary between algebro-geometric properties of elliptically fibered...

365. Non-supersymmetric heterotic model building

Stefan Groot Nibbelink

25/07/2015, 09:15

Non-Perturbative Field Theory and String Theory

talk

We discuss recent investigations of constructions of non-supersymmetric models in string theory. We start from the non-supersymmetric heterotic SO(16)xSO(16) in ten dimensions and describe its compactification on smooth and singular manifolds. We show that it is possible to get models that look quite similar to the Standard Model of particle physics. However, understanding the cosmological...

358. A class of 2D non-abelian gauged linear sigma models

Mr Andreas Gerhardus (Bethe Center for Theoretical Physics, Universität Bonn)

25/07/2015, 09:30

Non-Perturbative Field Theory and String Theory

talk

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...

151. Entanglement entropy and far-from-equilibrium energy flow

Dr Eugenio Megias (Max-Planck-Institut fur Physik, Munich)

25/07/2015, 09:45

Non-Perturbative Field Theory and String Theory

talk

The time evolution of the energy transport triggered in a strongly coupled quantum critical system by a temperature gradient is holographically related to the evolution of an asymptotically AdS black brane with a gradient in its planar horizon. Of relevance in these systems is the appearance of a universal steady state, described by a boosted thermal state. A relevant observable that provides...

124. Thermalization in a confining Gauge Theory at strong coupling

Prof. Elias Kiritsis (University of Crete and APC)

25/07/2015, 10:00

Non-Perturbative Field Theory and String Theory

talk

Time-dependent perturbations of states in a 3+1 dimensional confining gauge theory are considered in the context of holography. The perturbations are induced by varying the gauge theory's coupling of a dimension three scalar operator in time. The dual gravitational theory belongs to a class of Einstein-dilaton theories which exhibit a mass gap at zero temperature and a first order deconfining...

362. FRG Approach to Nuclear Matter in Extreme Conditions

Péter Pósfay (Wigner Research Centre for Physics)

25/07/2015, 10:15

Non-Perturbative Field Theory and String Theory

talk

Functional renormalization group (FRG) is an exact method for taking into account the effect of quantum fluctuations in the effective action of the system. The FRG method applied to effective theories of nuclear matter yields equation of state witch incorporates quantum fluctuations of the fields. Using the local potential approximation the equation of state for Walecka-type models of...

752. Tensor networks for gauge field theories

Karel Van Acoleyen (Ghent University)

25/07/2015, 11:30

Non-Perturbative Field Theory and String Theory

talk

In the last decade the tensor network state (TNS) formalism has emerged as a new language for our understanding of quantum many body systems. As a Hamiltonian variational method, the TNS framework can handle dynamical non-equilibrium phenomena and regimes with finite fermionic densities, and it therefore presents a promising complementary approach to the Monte-Carlo Euclidean lattice...

354. Error reduction using the covariant approximation averaging

Eigo Shintani (Mainz University)

25/07/2015, 11:45

Non-Perturbative Field Theory and String Theory

talk

I will present the recent result of nucleon form factor using error reduction technique, so called as all-mode-averaging. This algorithm is able to reduce the computational cost of correlation function in Monte-Carlo calculation by adopting the covariant approximation into quark propagator. In this talk, I will discuss this technique on nucleon form factor calculation and show the high...

753. Renormalization of the energy-momentum tensor on the lattice

Michele Pepe (INFN)

25/07/2015, 12:00

Non-Perturbative Field Theory and String Theory

talk

We construct an energy-momentum tensor on the lattice which satisfies the appropriate Ward Identities and has the right trace anomaly in the continuum limit. These relations come forth when the length of the box in the temporal direction is finite, and they take a particularly simple form if the coordinate and the periodicity axes are not aligned. We implement the method for the...

591. Universal aspects in the equation of state for Yang-Mills theories

Mr Alessandro Nada (University of Torino & INFN, Turin)

25/07/2015, 12:15

Non-Perturbative Field Theory and String Theory

talk

We present high-precision lattice calculations of the thermodynamics of Yang-Mills theories with different gauge groups. In the confining phase, we show that the equation of state is described remarkably well by a gas of massive, non-interacting glueballs, provided that an effective bosonic closed-string model is used to derive an exponentially growing Hagedorn spectrum for the heavy...

585. The low-lying spectrum of N=1 supersymmetric Yang-Mills theory

Dr Pietro Giudice (University of Münster)

25/07/2015, 12:30

Non-Perturbative Field Theory and String Theory

talk

The spectrum of the lightest bound states in N=1 supersymmetric Yang-Mills theory, calculated on the lattice, is presented. The masses have first been extrapolated towards vanishing gluino mass and then to the continuum limit. The final picture is consistent with the formation of degenerate supermultiplets.

624. Volume dependence in SU(N) gauge theories with twisted boundary conditions

Mateusz Koren (IFT UAM-CSIC Madrid)

25/07/2015, 12:45

Non-Perturbative Field Theory and String Theory

talk

We analyze 2+1 dimensional Yang-Mills theory on a spatial torus with twisted boundary conditions. It is conjectured that the physical quantities in the theory obey the so-called x-scaling, i.e. depend only on the variable x~NL/b and the magnetic flux, given by the parameters of the twist (L being the length of the spatial torus and b the inverse 't Hooft coupling). Using lattice...