# XQCD 2018

21-23 May 2018
Goethe University Frankfurt and FIAS
Europe/Berlin timezone
Home > Contribution List

## Contribution List

Displaying 68 contributions out of 68
Type: Poster Session: Poster Session
Quarkonia are produced in the heavy ion collisions and their production is modified compared with elementary collisions. This modification in the production of Quarkonia happens due to the presence of hot and dense QCD matter, named as quark-gluon plasma (QGP) formed in ultra relativistic heavy ion collisions. Existence of such kind of medium is observed in assymetric (p-Pb) collisions at 5.02 TeV ... More
Presented by Mr. Captain R. SINGH on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
The Hadron-Resonance Gas (HRG) approach - used to model hadronic matter at small baryon potentials $\mu_B$ and finite temperature $T$ - is extended to finite and large chemical potentials by introducing interactions between baryons in line with relativistic mean-field theory defining an interacting HRG (IHRG). Using lattice data for $\mu_B=0$ as well as information on the nuclear equation of state ... More
Presented by Mr. Thorsten STEINERT on 21 May 2018 at 6:30 PM
Type: Talk Session: Contributed Talks
We estimate the production rate of photons by the quark-gluon plasma in lat- tice QCD. We propose a new correlation function which provides better control over the systematic uncertainty in estimating the photon production rate at photon momenta in the range πT/2 to 2πT. The relevant Euclidean vector current correlation functions are computed with Nf = 2 Wilson clover fermions in the chirally-sy ... More
Presented by Aman STEINBERG on 23 May 2018 at 4:30 PM
Type: Talk Session: Contributed Talks
We present a relativistic causal description of conserved-charge diffusion for heavy-ion collisions and show that it produces measurable effects in observables such as the charge balance functions. Other descriptions, based on ordinary diffusion, are known to produce charge fluctuations which propagate with infinite velocity, thus violating a fundamental postulate of special relativity. We present ... More
Presented by Christopher PLUMBERG on 22 May 2018 at 3:00 PM
Type: Poster Session: Poster Session
We develop a kinetic framework to describe the matter in which the fermions are chiral. We extend the previous works about the chiral kinetic theory in external electromagnetic field to the case of curved spacetime. The berry curvature and chiral anomaly are encoded automatically. We use our framework to analyze the chiral vortical effect (CVE) and show connections between CVE in rotating frame an ... More
Presented by Prof. Xu-Guang HUANG on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
Recent lattice QCD studies at vanishing density exhibit the parity-doubling structure for the low-lying baryons around the chiral crossover temperature. This finding is likely an imprint of the chiral symmetry restoration in the baryonic sector of QCD, and is expected to occur also in cold dense matter, which makes it of major relevance for compact stars. By contrast, the latter is typically studi ... More
Presented by Mr. Michał MARCZENKO on 21 May 2018 at 6:30 PM
Type: Talk Session: Contributed Talks
By starting from the chiral kinetic theory in the relaxation-time approximation, an Israel-Stewart type formulation of the hydrodynamic equations for a chiral relativistic plasma is derived. By making use of the corresponding framework of dissipative chiral hydrodynamics, a range of various types of collective modes are studied.
Presented by Prof. Igor SHOVKOVY on 23 May 2018 at 3:00 PM
Type: Poster Session: Poster Session
The sign problem emerges in lattice QCD as soon as non-vanishing Baryon chemical potential is studied. This prevents direct simulations of the phase structure of strongly interacting matter. Complex Langevin simulations have been successfully used for various models or approximations of QCD. However, in some scenarios it converges to incorrect results. Here I will discuss a new method that keeps c ... More
Presented by Prof. Benjamin JAEGER on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
We study the Stephanov model, which is a Random Matrix Theory model for QCD at finite baryon density, using the Complex Langevin algorithm. Naive implementation of the algorithm shows convergence towards the phase quenched or quenched theory rather than to the intended theory with dynamical quarks. A detailed analysis of this issue various potential resolutions of the failure of this algorithm are ... More
Presented by Dr. Savvas ZAFEIROPOULOS on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
A novel equation of state with the surface tension induced by particles’ interactions was generalized to describe the properties of the neutron stars. In this equation the interaction between particles occurs via the hard core repulsion by taking into account the proper volumes of particles. Recently, this model was successfully applied to the description of the properties of nuclear and hadron ... More
Presented by Dr. Violetta SAGUN on 21 May 2018 at 6:30 PM
Type: Talk Session: Contributed Talks
Two important goals of the Beam Energy Scan program are the searches for the chiral magnetic effect (CME) and the QCD critical point(s). Since dynamic critical phenomena of a system generally depends on low-energy gapless modes, it is a priori nontrivial whether the collective gapless mode called the chiral magnetic wave (CMW) that stems from CME affects the dynamic critical phenomena in QCD. More ... More
Presented by Mr. Noriyuki SOGABE on 23 May 2018 at 2:30 PM
Type: Poster Session: Poster Session
Utilizing the dual QCD model in terms of the magnetic symmetry structure of non-Abelian gauge theories, the modified version of the dual QCD hadronic bag has been constructed in term of fuzzy bag which mainly satisfy the main qualitative feature observed for a strongly interacting QGP. Such picture identifies the new degrees of freedom as thermal monopoles such that the QCD matter behaves as a Sem ... More
Presented by Ms. Garima PUNETHA on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
We develop a macroscopic description of the space-time evolution of the energy-momentum tensor during the pre-equilibrium stage of a high-energy heavy-ion collision. Based on a weak coupling effective kinetic description of the microscopic equilibration process (\a la bottom-up"), we calculate the non-equilibrium evolution of the local background energy-momentum tensor as well as the non-equili ... More
Presented by Dr. Aleksas MAZELIAUSKAS, Dr. Soeren SCHLICHTING on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
The color-singlet representation of lattice QCD with staggered fermions offers a framework to soften the sign problem at finite density. This allows for the computation of the complete QCD phase diagram at strong coupling as well as at $\mathcal{O}(\beta)$. Furthermore, the chiral limit is cheap and thermodynamic quantities such as the energy density and the pressure can be computed easily. Using ... More
Presented by Mr. Dennis BOLLWEG on 21 May 2018 at 6:30 PM
Type: Talk Session: Contributed Talks
I give an update on the phase structure of QCD at vanishing and finite temperature and density with functional methods. Specifically results are discussed for the confinement-deconfinement and chiral phase transitions, the nature of these transitions and their interrelation, as well as the thermodynamics and fluctuations observables of QCD. The results on correlation functions are also used for ... More
Presented by Prof. Jan M. PAWLOWSKI on 21 May 2018 at 5:00 PM
Type: Talk Session: Contributed Talks
Motivated from the observations of yet-unexplained explosive phenomena associated with massive blue-supergiant stars with zero-age main sequence (ZAMS) masses well above 40 M$_\odot$, we shed new light on the idea that the appearance of QCD degrees of freedom may explain such cosmic events [1]. Obeying chiral physics and taking yet-another important observation of the very existence of massive neu ... More
Presented by Dr. Tobias FISCHER on 23 May 2018 at 11:30 AM
Type: Talk Session: Plenary Talks
I will discuss the rapid recent progress made in modelling these systems and show how the inspiral and merger of a binary system of neutron stars is more than a strong source of gravitational waves. Indeed, while the gravitational signal can provide tight constraints on the equation of state for matter at nuclear densities, the formation of a black-hole--torus system can explain much of the p ... More
Presented by Prof. Luciano REZZOLLA on 23 May 2018 at 9:00 AM
Session: Plenary Talks
Axial U(1) symmetry is broken by anomaly in QCD. In finite temperature, contribution to the order parameter of this symmetry from topologically non-trivial vacua may be suppressed and the symmetry could be effectively restored. This has been tested in lattice QCD simulations. But, the situation is still elusive. The fate of the axial U(1) symmetry is important in axion cosmology, universality clas ... More
Presented by Yasumichi AOKI on 21 May 2018 at 9:45 AM
Type: Talk Session: Contributed Talks
A review of interrelation between those two fields consistes of two parts. One covers recent progress in `magnetic scenario", which treats QGP as a dual plasma containing as quasiparticles not only quarks and gluons but also magnetic monopoles, dominating the ensamble near $T_c$. Recent account for monopoles contribution to jet quenching has solved the problem with azimuthal distribution ... More
Presented by Prof. Edward SHURYAK on 21 May 2018 at 11:30 AM
Type: Talk Session: Contributed Talks
We describe a numerical method which allows to go beyond the classical approximation for the real-time dynamics of many-body systems by approximating the many-body Wigner function by the most general Gaussian function with time-dependent mean and dispersion. On a simple example of a classically chaotic system with two degrees of freedom we demonstrate that the Gaussian state approximation is accur ... More
Presented by Dr. Pavel BUIVIDOVICH on 21 May 2018 at 12:00 PM
Type: Talk Session: Plenary Talks
The behaviour of a heavy quark within a hot QCD plasma is characterized by its kinetic and chemical equilibration rates, whereas the properties of a quark-antiquark pair are encoded in spectral functions related to various composite operators. We discuss the physics motivation, recent lattice studies, and outstanding challenges related to these observables.
Presented by Mikko LAINE on 21 May 2018 at 9:00 AM
Type: Poster Session: Poster Session
Hybrid Monte Carlo is traditionally employed in lattice QCD calculations. In principle, however, its applicability extends to a wide range of other interacting Fermion systems. One such system which can be simulated without a fermion-sign problem is the extended Hubbard model at half-filling, which describes electrons that can hop between the sites of a crystal lattice and includes on-site ($U$) a ... More
Presented by Dr. Dominik SMITH on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
A deep convolutional neural network (CNN) is constructed and trained in supervision to identify the QCD transition from the averaged final-state pion spectra ρ(pT,φ) in simulations of heavy-ion collisions with a hybrid model (iEBE-VISHNU), which couples (2+1)-D relativistic viscous hydrodynamics to a hadronic cascade “afterburner” (UrQMD). Hidden correlations in ρ(pT,φ) are captured by the ... More
Presented by Mr. Yilun DU on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
The lack of an order parameter in Yang-Mills theory with dynamical fundamental quarks is a long-standing problem in QCD. We exploit a web of dualities and information-theoretic techniques to study the phase structure of QCD from a new perspective. In particular, we examine the deconfinement transition in a deformed model of QCD: this is QCD compactified over a circle and considered at temperatures ... More
Presented by Dr. Mohamed ANBER on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
Strongly coupled systems are ubiquitous especially in the field of high energy and condensed matter physics. Investigation of these systems is complicated as conventional and perturbative methods fail to describe them. But with the introduction of AdS/CFT duality (or holography), it is now possible to capture the essential features of strongly coupled systems. In this work, we study the transpo ... More
Presented by Ms. Neha BHATNAGAR on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
Isospin asymmetry is the well-known property of dense quark matter, which exists in the compact stars and is produced in heavy ion collisions. On the other hand, the formation of dense quark matter in both of these cases is usually accompanied by a magnetic field strong enough to promote chiral magnetic effect (CME). To investigate quark matter under these conditions, we take into account bario ... More
Presented by Dr. Tamaz KHUNJUA on 21 May 2018 at 6:30 PM
Type: Talk Session: Contributed Talks
We discuss chiral magnetohydrodynamics (MHD) which serves as a low-energy effective theory of the chiral matter in the presence of a finite chirality imbalance and dynamical magnetic field [1]. It may have applications not only to relativistic heavy-ion collisions but also condensed matter physics and astrophysics. Based on our derivative expansion for the chiral MHD and the second law of ther ... More
Presented by Koichi HATTORI on 23 May 2018 at 2:00 PM
Type: Talk Session: Contributed Talks
We propose that rapidity dependent momentum correlations can be used to extract the shear relaxation time $\tau_\pi$ of the medium formed in high energy nuclear collisions. The stress-energy tensor in an equilibrium quark-gluon plasma is isotropic, but in nuclear collisions it is likely very far from this state. The relaxation time τπ characterizes the rate of isotropization and is a transport c ... More
Presented by Prof. George MOSCHELLI on 22 May 2018 at 12:00 PM
Type: Poster Session: Poster Session
I discuss the computation of phase diagrams of theories, which have similar symmetries as QCD, like the Gross-Neveu model or the NJL model in the limit of an infinite number of fermion flavors using lattice field theory and related numerical approaches. Particular focus is put on phases, where condensates are spatially inhomogeneous. First results are presented.
Presented by Prof. Marc WAGNER on 21 May 2018 at 6:30 PM
Type: Talk Session: Contributed Talks
We present the recent results on the confinement/deconfinement transition in lattice SU(2) QCD with two flavors of quarks at finite quark density and zero temperature. In the region $\mu_q$ ∼ 1000 MeV we observe the confinement/deconfinement transition which manifests itself in rising of the Polyakov loop and vanishing of the string tension $\sigma$. After the deconfinement is achieved at $\m ... More Presented by Dr. Aleksandr NIKOLAEV on 21 May 2018 at 5:30 PM Type: Talk Session: Contributed Talks We compute the cross section for photons emitted from a qq¯ pair produced from gluon splitting in proton-nucleus (p+A) collisions at ultra-relativistic energies [1]. The computation is performed within the dilute-dense kinematics of the Color Glass Condensate (CGC) effective theory. Although the result obtained is formally at next-to-leading order in the CGC power counting, it provides at higher ... More Presented by Mr. Oscar GARCIA MONTERO on 22 May 2018 at 11:30 AM Type: Poster Session: Poster Session The SU(3) flavor parity-doublet quark-hadron model is used to investigate the phase diagram of QCD matter. The quark sector of the model is tuned to the$\mu_B=0$lattice QCD data on trace anomaly. The structure of the baryon number susceptibilities in the temperature/chemical potential plane is studied in some detail. The model predicts three phase transitions - nuclear first-order liquid-gas ph ... More Presented by Mr. Anton MOTORNENKO on 21 May 2018 at 6:30 PM Type: Talk Session: Contributed Talks Non-central relativistic heavy ion collisions break longitudinal boost invariance due to forward-backward asymmetry in local participant densities. This gives rise to the observed rapidity-odd directed flow of charged particles. We demonstrate that the heavy flavor$v_1$due to the forward-backward asymmetric drag of the bulk is several times larger than that of the bulk$v_1$[1]. This makes the ... More Presented by sandeep CHATTERJEE on 22 May 2018 at 11:00 AM Type: Talk Session: Plenary Talks We show that effective field theory techniques can be applied in the high temperature T regime of plasmas to improve the accuracy of the physics of the hard scales (or scales of order T), and as a by-product, also that of the soft scales (or scales of order gT). At leading order in the coupling constant the hard scales of the plasma can be viewed as on-shell classical particles. Based on this obse ... More Presented by Prof. Cristina MANUEL on 22 May 2018 at 9:45 AM Type: Talk Session: Contributed Talks QCD equation of state at finite baryon density is studied in the framework of a Cluster Expansion Model (CEM), which is based on a fugacity expansion of the net baryon density. CEM uses the leading two Fourier coefficients from lattice simulations at imaginary$\mu_B$as the only model input. Excellent description of the available lattice data at both$\mu_B = 0$and at imaginary$\mu_B$is obtai ... More Presented by Mr. Volodymyr VOVCHENKO on 21 May 2018 at 3:30 PM Type: Poster Session: Poster Session The QCD phase diagram at finite temperature and density has a very rich physical structure which can be explored with first principle lattice QCD calculations. Simulations of lattice QCD with non-vanishing real chemical potential ($\mu$) suffer from the infamous "sign problem". However, one can perform simulations using purely imaginary chemical potentials where the "sign problem" is absent. Us ... More Presented by Jishnu GOSWAMI on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session The QCD phase diagram is studied in the presence of an isospin asymmetry using continuum extrapolated staggered quarks with physical masses. In particular, we investigate the phase boundary between the normal and the pion condensation phases and the chiral/deconfinement transition. The simulations are performed with a small explicit breaking parameter in order to avoid the accumulation of zero mod ... More Presented by Mr. Sebastian SCHMALZBAUER on 21 May 2018 at 6:30 PM Type: Talk Session: Contributed Talks We summarise recent theoretical results on the QCD phase diagram and the properties of QCD's critical point based on a combination of lattice QCD and Dyson-Schwinger equations. Using lattice input for the quenched gluon propagator, our approach correctly reproduced and predicted Nf=2+1 flavour lattice results for the quark condensate and the unquenched electric and magnetic gluon propagat ... More Presented by Prof. Christian FISCHER on 23 May 2018 at 4:00 PM Type: Talk Session: Plenary Talks QCD with strong electromagnetic fields is relevant for heavy-ion collisions, the early universe and strongly magnetized neutron stars. Amenable to lattice simulations, its thermodynamics shows some unexpected features like inverse magnetic catalysis. I review our numerical results and show that many effects can be understood -- at least qualitatively -- by (otherwise free) fermions in magnetic fie ... More Presented by Dr. Falk BRUCKMANN on 23 May 2018 at 9:45 AM Type: Talk Session: Contributed Talks We will present new state-of-the-art lattice QCD results on the chiral crossover temperature of QCD for moderately large baryon chemical potential. Firstly, we will present a more precise updated result for the QCD pseudo-critical temperature at zero baryon chemical potential, obtained from all possible second-order chiral susceptibilities that diverge in the chiral limit. Then we will present new ... More Presented by Swagato MUKHERJEE on 21 May 2018 at 2:30 PM Type: Poster Session: Poster Session The formation of quark matter in core-collapse supernovae and neutron star mergers could leave interesting observable imprints on the resulting electromagnetic, gravitational and neutrino emissions. In fact, simulations have shown that the early formation of quark matter could have a significant impact upon the dynamics of core-collapse supernovae, including a characteristic second neutrino bu ... More Presented by Mauricio HIPPERT on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session The dominant cost of most lattice QCD simulations is the inversion of the Dirac operator required to calculate the force term in the RHMC update. One way to improve this situation is to use multiple psuedofermions, which reduces the force and hence allows a larger integration step size to be used, at the cost of having to invert the Dirac operator for each pseudofermion field. Recently there ... More Presented by Liam KEEGAN on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session Fluctuations have been playing an important role in understanding observables in high-energy nuclear collisions. Higher harmonics of azimuthal angle distributions, for example, can be attributed to initial fluctuations of transverse profile from event to event. In this presentation, we focus on thermal fluctuations during hydrodynamic evolution (i.e. hydrodynamic fluctuations) of the QGP f ... More Presented by Mrs. Azumi SAKAI on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session Elucidating the production process of heavy quark bound states is a central goal in heavy-ion collisions [1]. Two central questions exist: Do bound states of heavy quarks form in the early time evolution of the glasma? If so, in which time regime can that happen? An Answer requires the development of a non-perturbative treatment of the real-time-dynamics of heavy quarkonia. Here we present prel ... More Presented by Mr. Alexader LEHMANN on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session Elucidating the production process of heavy quark bound states is a central goal in heavy-ion collisions [1]. Two central questions exist: Do bound states of heavy quarks form in the early time evolution of the glasma? If so, in which time regime can that happen? An Answer requires the development of a non-perturbative treatment of the real-time-dynamics of heavy quarkonia. Here we present prel ... More Presented by Mr. Alexader LEHMANN on 21 May 2018 at 6:30 PM Type: Talk Session: Plenary Talks Recent results for collective motion in heavy ion collisions will be presented Presented by Prof. Raimond SNELLINGS on 22 May 2018 at 9:00 AM Type: Poster Session: Poster Session A new framework for relativistic hydrodynamics with spin is proposed. It is based on the conservation laws for charge, energy, momentum, and angular momentum. The conservation laws lead to hydrodynamic equations for the charge density, local temperature, and fluid velocity, as well as for the polarization tensor. The resulting set of differential equations extend the standard picture of perfect-fl ... More Presented by Enrico SPERANZA on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session One of the main challenges in simulations on Lefschetz thimbles is the computation of the relative weights of contributing thimbles. In this work we propose a solution to that problem by means of computing those weights using a reweighting procedure. Besides we present recipes for finding parametrizations of thimbles and anti-thimbles for a given theory. Moreover, we study some approaches to combi ... More Presented by Mr. Felix ZIEGLER on 21 May 2018 at 6:30 PM Type: Talk Session: Contributed Talks In this talk I shall discuss the S-matrix formulation of statistical mechanics, which connects the scattering matrix elements to the thermodynamic observables. The approach allows a consistent treatment of broad resonances and purely repulsive channels, while correctly implementing the constraints from the chiral perturbation theory. This provides a useful framework for identifying the limi ... More Presented by Dr. Pok Man LO on 21 May 2018 at 11:00 AM Session: Plenary Talks In the last few years highly precise determinations of the equation of state of the SU(3) Yang-Mills theory have become available from different methods. Indeed, the purely gluonic sector of QCD provides a perfect framework for testing new computational techniques, while avoiding most of the technical challenges of the theory with dynamical fermions. In this talk I will present an overview of rece ... More Presented by Dr. Alessandro NADA on 21 May 2018 at 4:30 PM Type: Poster Session: Poster Session I will illustrate how our recently developed renormalization group optimized perturbation theory (RGOPT) resums perturbative expansions in thermal field theories. The convergence and scale dependence of RGOPT thermodynamical quantities are drastically improved as compared to standard perturbative expansions, and it cures the odd drastic scale dependence observed in other related methods such as th ... More Presented by jean-loic KNEUR on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session We will discuss some results about the behaviour of the screening properties of high-T QCD at finite density. More precisely we will report on the dependence on the baryon chemical potential of the QCD screening masses and of the heavy-quark free energy, as extracted from 2+1 flavours Lattice QCD simulations at the physical point. While for the screening masses a particularly interesting regi ... More Presented by Mr. Andrea RUCCI on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session During last few years our group developed the most advanced model of the hadron resonance gas [1] which not only allowed us to achieve the best description of all hadronic multiplicities measured from the lowest AGS to the highest RHIC energies, but also to reveal the remarkable irregularities at chemical freeze-out [2-5]. It is intriguing that in central nuclear collisions we found two sets of ... More Presented by Prof. Kyrill BUGAEV on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session We first motivate the need for an improved equation of state, accounting for the finite size of hot, quantum and relativistic quark-gluon plasmas, such as created in modern Heavy Ion Collisions (HIC). We then focus on finite size corrections by means of relevant spatial compactifications, while considering a single non-interacting massless scalar field as a toy model. Consequently, we present vari ... More Presented by Dr. Sylvain MOGLIACCI on 21 May 2018 at 6:30 PM Type: Talk Session: Contributed Talks We study the spectral properties of a highly occupied non-Abelian non-equilibrium plasma that is expected to be created during the initial stages of heavy-ion collisions in the weak-coupling description of the collisions. The spectral function of this far-from-equilibrium plasma is measured by employing linear response theory in classical-statistical real-time lattice Yang-Mills simulations. We es ... More Presented by Kirill BOGUSLAVSKI on 22 May 2018 at 2:00 PM Type: Talk Session: Contributed Talks We study the spatial distribution of the stress tensor around the quark--anti-quark system in SU(3) lattice gauge theory. The formation of the flux tube and its detailed structure after the continuum limit is revealed in terms of the stress tensor. The Yang-Mills gradient flow plays a crucial role to realize the analysis of the stress tensor on the lattice. We also perform an analysis of the stre ... More Presented by Prof. Masakiyo KITAZAWA on 23 May 2018 at 12:00 PM Type: Talk Session: Contributed Talks We present a new equation of state for the nucleonic and hyperonic inner core of neutron stars that fulfills the 2 Msun observations as well as the recent determinations of stellar radii below 13 km. The equation of state is obtained from a new parametrization of the FSU2 relativistic mean-field functional that satisfies these latest astrophysical constraints and, at the same time, reproduces the ... More Presented by Dr. Laura TOLOS on 23 May 2018 at 11:00 AM Type: Talk Session: Contributed Talks We will discuss the behaviour of the (pseudo)critical temperature of QCD as a function of the baryon chemical potential for physical quark masses. This behaviour has been extracted from 2+1 flavour lattice QCD simulations using both the imaginary chemical potential and the Taylor expansion approach; on the contrary of previous results in the literature, a good agreement between the two determinati ... More Presented by Dr. Claudio BONATI on 21 May 2018 at 3:00 PM Type: Poster Session: Poster Session Attempts to extract the order of the chiral transition of QCD at zero chemical potential, with two dynamical flavours of massless quarks, from simulations with progressively decreasing pion mass have remained inconclusive because of their increasing numerical cost. In an alternative approach to this problem, we consider the path integral as a function of continuous number$N_f$of degenerate quark ... More Presented by Dr. Francesca CUTERI on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session The phase diagram of QCD is one of the most interesting problems in modern physics which so far has not been sufficiently investigated from first principle calculations at mu/T > 1, mainly due to the sign problem of lattice QCD. One of the most promising methods to tackle the sign problem in lattice simulations is the complex Langevin method, which recently has been successfully applied to QCD ... More Presented by Mr. Manuel SCHERZER on 21 May 2018 at 6:30 PM Type: Poster Session: Poster Session We study the effect of an external static magnetic field of strength comparable with the QCD scale$\Lambda_{QCD}\sim200$MeV on the deconfinement/chiral restoration transition. Lattice simulations have been carried out with$2+1$flavours, Symanzik three-level improved gauge action and stout improved rooted staggered fermions. In particular, the dependence of the pseudocritical temperature$T_c\$ ... More
Presented by Mr. Floriano MANIGRASSO on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
For the understanding of the fluctuation measurements in heavy-ion collisions it is crucial to develop quantitatively reliable dynamical descriptions. In order to study the phase transition, both in crossover regime as well as near the conjectured QCD critical point, the non-perturbative nature needs to be fully included. In this talk, we outline a novel QCD-assisted transport approach based ... More
Presented by Mr. Nicolas WINK on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
We study, by Monte-Carlo simulations, an SU(3) Yang Mills theory at finite temperature with a deformation proportional to the square of the trace of Polyakov loop. Due to this deformation, we can force the system to recover center symmetry even after the usual deconfinement transition. We analyse the properties of this new phase, in which center symmetry is not spontaneously broken, focusing ... More
Presented by Mr. Marco CARDINALI on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
Nonzero chiral density leads to a plenty of interesting unusual phenomena, including chiral catalysis, chiral magnetic effect and others. We study how nonzero chiral density affects topological and confinement properties of the system. We present the dependence of the string tension and topological susceptibility on chiral chemical potential. We see that both observables grow with chiral density ... More
Presented by Mr. Andrey KOTOV on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
We explore the feasibility of new algorithms, devised for an efficient sampling of the topological charge distribution in the high temperature phase of QCD, and present some preliminary results regarding the temperature dependence of the topological susceptibility
Presented by Mr. Antonino TODARO on 21 May 2018 at 6:30 PM
Type: Talk Session: Contributed Talks
We investigate the radiative break-up highly energetic quark and gluon jets due to medium-induced Bremsstrahlung in a high-temperature plasma. We find that within an inertial range of momenta T << p << E, where E denotes the energy of the jet and T the temperature of of the medium, the quark/gluon ratio of fragments is identical for quark and gluon jets and approximately given by the ratio of ... More
Presented by Dr. Soeren SCHLICHTING on 22 May 2018 at 2:30 PM
Type: Poster Session: Poster Session
For quark matter studies in astrophysics the thermodynamic bag model (tdBag) has been widely used. It approximates the effect of quark confinement, but does not explicitly account for the breaking of chiral symmetry, an important property of Quantum Chromodynamics (QCD). It also doesn't account for repulsive vector interaction necessairy for astrophysical studies. vBag extends the tdBag approach b ... More
Presented by Mr. Mateusz CIERNIAK on 21 May 2018 at 6:30 PM
Type: Poster Session: Poster Session
In semi-central AA collisions, both deconfined matter (QGP) and strong strong electromagnetic fields from fast moving charge nucleus can be produced when nuclei collide with each other. QGP with extremely large energy density result in strong color screening on the heavy quarkonium potential and quarkonium yield suppression. At the same time, abundant number of heavy(or strange) quarks inside QGP ... More
Presented by Dr. Baoyi CHEN on 21 May 2018 at 6:30 PM