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Eduardo Royo (Universidad de Zaragoza)01/08/2016, 17:25Quantum Field Theories of dense, cold matterPosterUnderstanding the role of the $\theta$ parameter in QCD and its connection with the strong CP problem and axion physics is one of the major challenges for high energy theorists. Due to the sign problem, at present only the QCD topological susceptibility is well known. Using an algorithmic approach that could potentially be extended to QCD, we study as a first step the $\theta$-dependence...Go to contribution page
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Ms Ouraman Hajizadeh (University of Graz)01/08/2016, 17:25Quantum Field Theories of dense, cold matterPosterG2-QCD, i.e. QCD with the gauge group SU(3) replaced by the exceptional group G(2), shares many features with SU(3). But it is accessible at finite density on the lattice, as it has no sign problem, and at the same time has a neutron. Therefore, this theory can sustain in princple neutron star. Using the equation of state for this theory from lattice simulations, we solve...Go to contribution page
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Dr Julien Frison (KEK Theory Center)01/08/2016, 17:25Bulk properties of the quark-gluon plasmaPosterAt $T>T_c$, the topological susceptibility quickly drops down, although the precise speed of this fall is still subject to theoretical debates. It then becomes practically impossible for lattice QCD to handle volumes large enough to allow non-trivial topology and a precise sampling of the sectors involved in the $\theta=0$ vacuum. We present a new method applicable to the computation of the...Go to contribution page
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Prof. Gert Aarts (Swansea University)01/08/2016, 17:25Transport properties and probesPosterUnlike mesons, lattice studies of baryons at finite temperature are very limited. We present results for baryon correlators and spectral functions across the deconfinement transition, using the FASTSUM 2+1 flavour ensembles as well as results with free lattice fermions.Go to contribution page
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Dr Mathias Wagner (NVIDIA)01/08/2016, 17:25PosterAnalysis tasks in Lattice QCD thermodynamics often requires solving linear equations for multiple right hand sides for a constant gauge field. Recently deflation methods have become more widely used and proven to be very efficient. They however do require the calculation and storing of eigenvectors which is either not always feasible or suffer from high setup costs. We present results for an...Go to contribution page
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Mr Haitao Shu (CCNU)01/08/2016, 17:25Transport properties and probesPosterWe present our most updated results on the charmonium correlation and spectral functions. The correlation functions are obtained using the clover improved Wilson fermions on quenched lattices with spatial size fixed to 192. And temporal sizes of these lattices are chosen to be 96, 64, 56, 48 and 32 corresponding to 0.73, 1.1, 1.25, 1.5 and 2.2 Tc. We perform a detailed analysis of these...Go to contribution page
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Mr Sheng-Tai Li (Central China Normal University)01/08/2016, 17:25QCD phase diagramPosterWe present our recent results on the chiral phase transition in 2+1 flavor QCD on lattices with temporal extent $N_{\tau} = 6$. We have performed lattice QCD simulations using the Highly Improved Staggered Quarks with 5 different values of pion masses, i.e. 160, 140, 110, 90, 80 MeV in a temperature window from 140 MeV to 170 MeV. We have analyzed the universal scaling behaviour of the chiral...Go to contribution page
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Dr Savvas Zafeiropoulos (Goethe University Frankfurt)01/08/2016, 17:25Quantum Field Theories of dense, cold matterPosterWe study a Random Matrix Model for QCD at finite density via Complex Langevin dynamics. This model has a phase transition to a phase with non-zero baryon density. We study the convergence of the algorithm as a function of the quark mass and the chemical potential and focus on two main observables: the baryon density and the chiral condensate. As expected, for simulations close to the chiral...Go to contribution page
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Mr Francesco Sanfilippo (University of Southampton)01/08/2016, 17:25Bulk properties of the quark-gluon plasmaPosterOne of the greatest achievement of lattice QCD is the numerical determination of the confinement potential between pairs of static quarks, as well as the measurement of the shape of the color-flux tube connecting them. In this talk I will present how this is modified in the presence of a magnetic field.Go to contribution page
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Akihiro Shibata (Computing Research Center, KEK)01/08/2016, 17:25QCD phase diagramPoster
The dual superconductivity is a promising mechanism for quark confinement. We have presented a new formulation of the Yang-Mills theory on the lattice, and pointed out that the $SU(3)$ Yang-Mills theory has a new way of reformulation using new field variables (minimal option), in addition to the conventional option adopted by Cho, Faddeev and Niemi (maximal option). In the preceding...
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Dr Anthony Francis (York University)01/08/2016, 17:25Transport properties and probesPosterWe present results on the isovector vector channel spectral functions at vanishing momentum across the deconfinement phase transition in dynamical $n_f=2$ lattice QCD. Using Wilson-Clover fermions the calculations are carried out with a vacuum pion mass of $\simeq 270$MeV at the temperatures $T/T_c=0.156, 0.8, 1.0, 1.25$ and 1.67. The spectral functions are reconstructed from local-conserved...Go to contribution page
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Prof. Ion-Olimpiu Stamatescu (I.T.P., University Heidelberg)01/08/2016, 17:25Quantum Field Theories of dense, cold matterPosterZeroes in the fermionic determinant induce poles in the drift of the Langevin equation. We here study their effect on Complex Langevin simulations in an effective model related to QCD in the limit of heavy quarks and large chemical potential. The latter was defined long ago by one of the authors and used thereafter in various contexts. We approach in this way a quantitative...Go to contribution page
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Dr Saumen Datta (Tata Institute of Fundamental Research)01/08/2016, 17:25Transport properties and probesPosterThe deconfinement transition is typically studied using the Polyakov loop, which needs renormalization. We look at the renormalization of Polyakov loop using Wilson flow, for both quenched and $N_f=2$ QCD. We also investigate some observables related to the Polyakov loop that has been suggested, and the behavior of the gluon condensate across the transition.Go to contribution page
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Mr Francesco Capponi (Plymouth University)01/08/2016, 17:25Transport properties and probesPosterWe present an update about our program for the non perturbative renormalization of the energy momentum tensor. Our strategy is based on probing suitable lattice Ward identities with observables computed along the gradient flow. This set of identities exhibits many interesting qualities, resulting from the UV finiteness of flowed composite operators, and can be used to measure the...Go to contribution page
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Mr Felix Ziegler (Heidelberg University)01/08/2016, 17:25PosterStudying the topological properties of the QCD vacuum on the lattice, observables such as the gauge action density are blurred by short distance fluctuations at scales of the order of the lattice spacing. To extract the physical content from the mentioned configurations, those have to be treated using smoothing methods such as cooling or the Wilson flow which have been investigated...Go to contribution page
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Dr Benjamin Jaeger (Swansea University)01/08/2016, 17:25Quantum Field Theories of dense, cold matterPosterComplex Langevin methods have been successfully applied in theories that suffer from a sign problem such as HDQCD. We present and illustrate a novel method that ensures that Complex Langevin simulations stay close to the SU(3) manifold, which lead to correct and improved results in the framework of HDQCD and pure gauge simulations. Applying the same technique in fully dynamical QCD simulations...Go to contribution page
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Dr Bastian Brandt (University of Frankfurt)01/08/2016, 17:25QCD phase diagramPosterWe study the strength of the anomalous breaking of the $U_A(1)$ symmetry in the chiral limit of two-flavour QCD at the transition temperature using the difference of the pseudoscalar and scalar iso-vector screening masses. To this end we use simulations with non-perturbatively $O(a)$-improved Wilson fermions for three different pion masses in the range of 200-550MeV on lattices with a temporal...Go to contribution page
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Mr Tobias Rindlisbacher (ETH Zürich)01/08/2016, 17:25Quantum Field Theories of dense, cold matterPosterWe recently proposed a new type of worm algorithm for simulating the CP(N-1) model at finite density in a dual representation based on flux-variables. Here we continue by discussing how a topological term can be incorporated into our dual formulation.Go to contribution page
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Dr pietro giudice (University of Muenster)01/08/2016, 17:25Quantum Field Theories of dense, cold matterPosterWe study two-color QCD with two flavours of Wilson fermion as a function of quark chemical potential and temperature. Recent results are presented and the phase diagram is discussed.Go to contribution page
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Mr Dean Thomas (Swansea University)01/08/2016, 17:25QCD phase diagramPosterTopology driven techniques are an important and established tool in volume visualisation computer graphics; however, they have yet to see widespread adoption in the lattice QCD community. In comparison to traditional isosurfacing algorithms they offer a number of advantages including faster rendering speeds and enhanced data exploration possibilities. The ability to summarise the topology of...Go to contribution page
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Dr Szabolcs Borsanyi (University of Wuppertal)01/08/2016, 17:25QCD phase diagramPosterWe calculate the QCD cross-over temperature, the equation of state and fluctuations of conserved charges at finite density by analytical continuation from imaginary to real chemical potentials. Our calculations are based on new continuum extrapolated lattice simulations using the 4stout staggered actions with a lattice resolution up to Nt=16. The simulation parameters are tuned such that the...Go to contribution page
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