Gabor Papp

Random Matrices and Chiral Symmetry in QCD

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

In this talk we review some recent results from random matrix models as applied to some non-perturbative issues in QCD. All of the issues we will discuss touched upon the important…

physics.comp-ph2024

Applications of Domain Adversarial Neural Network in phase transition of 3D Potts model

Xiangna Chen, Feiyi Liu, Weibing Deng +5

Machine learning techniques exhibit significant performance in discriminating different phases of matter and provide a new avenue for studying phase transitions. We investigate the…

hep-th1999

Light-cone Hamiltonian flow for positronium

Elena L. Gubankova, Hans-Christian Pauli, Franz J. Wegner +1

The technique of Hamiltonian flow equations is applied to the canonical Hamiltonian of quantum electrodynamics in the front form and 3+1 dimensions. The aim is to generate a bound…

hep-th1997

Various Shades of Blue's Functions

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

We discuss random matrix models in terms of elementary operations on Blue's functions (functional inverse of Green's functions). We show that such operations embody the essence of…

Two-level system with noise: Blue's function approach

Ewa Gudowska-Nowak, Gabor Papp, Juergen Brickmann

By using the random matrix approach and generalized Blue's function representation we solve analytically the model of an effective two-level system coupled to a noise reservoir. We…

nucl-th1999

The phase diagram and bulk thermodynamical quantities in the NJL model at finite temperature and density

Thomas M. Schwarz, Sandra P. Klevansky, Gabor Papp

We reexamine the recent instanton motivated studies of Alford, Rajagopal and Wilczek, and Berges and Rajagopal in the framework of the standard SU(2) Nambu-Jona-Lasinio model. The…

A Four-Fermi Model in 0+1 Dimensions in Matter

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

The results of a number of constituent quark models in matter may be understood in the mean-field approximation by using a simple four-fermi model in 0+1 dimensions.

hep-ph2007

Intrinsic transverse momentum in di-hadron correlations

Gabor Papp, Peter Levai, George Fai

We study di-hadron correlations in proton-proton collisions at $s = 200$ GeV and interpret experimental data in terms of a fragmentation width and a momentum imbalance. A fr…

$I^¸$ Vacuum: A Matrix Model

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

We model the effects of a large number of zero modes for $N_{f}$ species of quarks at finite vacuum angle $I^¸$ , using a matrix model with gaussian weights constrained by the topologi…

Chiral Disorder and Diffusion in The QCD Vacuum

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

In this talk, which popularizes some of our recent work, we provide novel insights into the bulk properties of light chiral quarks in a fixed Euclidean volume (e.g. lattice QCD). W…

hep-lat1999

U(1) Problem at Finite Temperature

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

We model the effects of a large number of zero and near-zero modes in the QCD partition function by using sparse chiral matrix models with an emphasis on the quenched topological s…

Localization Transitions from Free Random Variables

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

We motivate and use the concept of free random variables for the studies of the de-pinning transition of flux lines in superconductors as recently discussed by Hatano and Nelson. W…

hep-th1999

Light-cone Hamiltonian flow for positronium. The numerical solutions

Elena Gubankova, Gabor Papp

The effective Hamiltonian, as obtained from applying the Hamiltonian flow equations to front form QED, are solved numerically for positronium. Both the exchange and the annihilatio…

cond-mat.dis-nn1999

Green's Functions in Non-hermitian Random Matrix Models

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

We review some recent techniques for dealing with non-hermitian random matrix models based on generalized Green's functions. We introduce the diagrammatic methods in the hermitian…

Chiral Random Matrix Models in QCD

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

We review some motivation behind the introduction of chiral random matrix models in QCD, with particular emphasis on the importance of the Gell-Mann-Oakes (GOR) relation for these…

cond-mat.stat-mech2024

Study of phase transition of Potts model with Domain Adversarial Neural Network

Xiangna Chen, Feiyi Liu, Shiyang Chen +5

A transfer learning method, Domain Adversarial Neural Network (DANN), is introduced to study the phase transition of two-dimensional q-state Potts model. With the DANN, we only nee…

Chiral Disorder and Diffusion of Light Quarks in the QCD Vacuum

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

We give a pedagogical introduction to the concept that light quarks diffuse in the QCD vacuum following the spontaneous breaking of chiral symmetry. By analogy with disordered elec…

Two-Color QCD and Aharonov-Bohm Fluxes

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

We investigate the effects of several Abelian Aharonov-Bohm fluxes $I ¨ $ on the Euclidean Dirac spectrum of light quarks in QCD with two colors. A quantitative change in the quark r…

cond-mat2003

Are Scale Free Networks Better?

Gergely Peli, Gabor Papp

We study the performance of Weibull and scale free Internet-like networks and compare them to a classical random graph based network. The scaling of the traffic load with the nodal…

hep-lat2021

Machine learning Hadron Spectral Functions in Lattice QCD

Shi-Yang Chen, Heng-Tong Ding, Fei-Yi Liu +2

Hadron spectral functions carry all the information of hadrons and are encoded in the Euclidean two-point correlation functions. The extraction of hadron spectral functions from th…

Chiral Disorder and QCD Phase Transitions

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

If QCD is to undergo a second order phase transition, the light quark return probability is universal for large times at the critical point. We show that this behavior is distinct…

cond-mat.stat-mech2007

Random Levy Matrices Revisited

Zdzislaw Burda, Jerzy Jurkiewicz, Maciej A. Nowak +2

We compare eigenvalue densities of Wigner random matrices whose elements are independent identically distributed (iid) random numbers with a Levy distribution and maximally random…

nucl-th1999

Saturating Cronin effect in ultrarelativistic proton-nucleus collisions

Gabor Papp, Peter Levai, George Fai

Pion and photon production cross sections are analyzed in proton-proton and proton-nucleus collisions at energies 20 GeV < s^1/2 < 60 GeV. We separate the proton-proton and nuclear…

Hard Photons and Neutral Pions from RHIC

Gabor Papp, George Fai, Peter Levai

In order to fix the parameters for predictions of hard photon and pion production in $A u + A u$ collisions at $s = 200$ GeV, proton-proton and proton-nucleus data are analyzed in…

Nonhermitean Random Matrix Models

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

We introduce an extension of the diagrammatic rules in random matrix theory and apply it to nonhermitean random matrix models using the 1/N approximation. A number of one- and two-…

nucl-th2002

Differences in high p_t meson production between CERN SPS and RHIC heavy ion collisions

Gabor Papp, Peter Levai, Gergely G. Barnafoldi +2

In this talk we present a perturbative QCD improved parton model calculation for light meson production in high energy heavy ion collisions. In order to describe the experimental d…

nucl-th1999

Nuclear Effects in High Energy Photon and Neutral Pion Production

Gabor Papp, George Fai, Peter Levai

We study the mechanism of the $I^^{3}$ and $I ¨ ^{0}$ enhancement at large transverse momenta in proton-nucleus collisions. A proposed mechanism suggests an increase in the width of the tr…

hep-ph2020

Scaling properties of jet-momentum profiles with multiplicity

Antal Gemes, Robert Vertesi, Gabor Papp +1

We study the structure of jets in proton-proton collisions at LHC energies using \textsc{Pythia} 8 Monte Carlo simulations. We demonstrate that the radial jet profiles exhibit scal…

physics.soc-ph2005

Random Matrix Filtering in Portfolio Optimization

Gabor Papp, Szilard Pafka, Maciej A. Nowak +1

We study empirical covariance matrices in finance. Due to the limited amount of available input information, these objects incorporate a huge amount of noise, so their naive use in…

Bridged-assisted electron transfer. Random matrix theory approach

Ewa Gudowska-Nowak, Gabor Papp, Juergen Brickmann

We discuss the effective donor/acceptor coupling for a bridged electron transfer system with a site-diagonal disorder of bridge energies. The average spectral properties of the sys…

cond-mat.stat-mech2022

Transfer learning of phase transitions in percolation and directed percolation

Jianmin Shen, Feiyi Liu, Shiyang Chen +6

The latest advances of statistical physics have shown remarkable performance of machine learning in identifying phase transitions. In this paper, we apply domain adversarial neural…

hep-lat1996

The U(1) Problem in Chiral Random Matrix Models

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

We show that conventional asymmetric chiral random matrix models (ChRMM), with a gaussian distribution in the asymmetry, provide for a screening of the topological charge and a res…

nucl-th1996

Pre-Cluster Dynamics In Multifragmentation

W. Norenberg, Gabor Papp

The initial production and dynamical expansion of hot spherical nuclei are examined as the first stage both in the projectile-multifragmentation and in central collision processes.…

$I^¸$ Vacuum in a Random Matrix Model

Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1

Inspired by recent lattice calculations, we model certain aspects of the $I^¸$ -vacuum using a matrix model with gaussian weights. The vacuum energy exhibits a cusp at $I^¸ < I ¨ $ that i…

QCD Spectra and Random Matrix Models

Gabor Papp

We summarize some recent results on the application of macroscopic spectral properties of random matrix models (RMM) to the QCD spectra. A comparison to existing lattice simulation…