2,751 research outputs found
Lattice-Renormalization of the Polyakov Loop
No full textZantow F. Lattice-Renormalization of the Polyakov Loop. Bielefeld: Fakultät für Physik; 2003
On T dependence of the static potential V(T, R) in a finite volume
No full textWe study the dependence on of the static potential defined from Wilson loops and from Polyakov loop correlators on a finite lattice. For this study we employ a simple model with confinement, and compare with MC results
Geração radiativa de repulsão vetorial para quarks leves
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Física, Florianópolis, 2014Abstract: We apply a non-perturbative analytical method, known as the Optimized PerturbationTheory (OPT), to the Polyakov-Nambu-Jona-Lasinio (PNJL) model in order to investigate physical quantities associated with the QCD phase transitions. We consider the Taylor expansion of the pressure in powers of µ/T obtaining the second cumulant (c2) which is associated to the quark number susceptibility. We discuss how the OPT nite Nc radiative (quantum) corrections induce a contribution to the pressure which behaves as a vector repulsion even when such a channel is absent in the original classical potential. Our results are then compared with the ones furnished by lattice QCD simulations and by the large-Nc approximation showing that, physically, the OPT results resemble those furnished by the latter approximation when a repulsive vector channel is explicitly included in the classical potential. In this case, both approximations fail to correctly describe the Stefan-Boltzmann limit at high temperatures. We discuss how this problem can be circumvented by taking the couplings to be temperature dependent so as to simulate the phenomenon of asymptotic freedom. Since this is the first time the OPT is applied to the PNJL we also discuss many technicalities associated with the evaluation of two loop (exchange) diagrams.Neste trabalho o método analítico não perturbativo conhecido como Teoria de Perturbação Otimizada (OPT) é aplicada ao modelo de Polyakov-Nambu-Jona-Lasinio (PNJL) para que quantidades físicas, associadas com as transições de fase da QCD, possam ser calculadas. A expansão da pressão em potências de µ/T é considerada para obter o segundo cumulante (c2) que é uma quantidade relacionada com a susceptibilidade do número de quarks. Primeiramente discutimos como as correções radiativas de Nc finito geradas pela OPT produzem uma contribuição que se comporta como um termo vetorial repulsivo mesmo quando este tipo de canal está ausente no potencial clássico original. Em seguida, nossos resultados são comparados com aqueles fornecidos pelas simulações na rede e também pela aproximação de Nc grande(LN). Fisicamente, os resultados da OPT são similares aqueles fornecidos pela aproximação LN quando um canal vetorial repulsivo é explicitamente incluido no potencial clássico. Neste caso, nenhuma destas aproximações analíticas produz corretamente o limite de Stefan Boltzmann para altas temperaturas. Contudo, nossos resultados sugerem como estes problemas podem ser contornados tomando-se as constantes de acoplamento como sendo dependentes da temperatura, de maneira que o fenômeno da liberdade assimptótica possa ser simulado. Esta é a primeira vez que a OPT é aplicada ao modelo de PNJL e por isto vários aspectos técnicos relacionados com o cálculo de diagramas de dois laços são também aqui apresentados
Detection of network attacks based on adaptive resonance theoty
No full textBukhanov D. G. Detection of network attacks based on adaptive resonance theoty / D. G. Bukhanov, V. M. Polyakov // IOP Conf. Series: Journal of Physics. - 2018. - Vol.1015. - 042007.The paper considers an approach to intrusion detection systems using a neural network of adaptive resonant theory. It suggests the structure of an intrusion detection system consisting of two types of program modules. The first module manages connections of user applications by preventing the undesirable ones. The second analyzes the incoming network traffic parameters to check potential network attacks. After attack detection, it notifies the required stations using a secure transmission channel. The paper describes the experiment on the detection and recognition of network attacks using the test selection. It also compares the obtained results with similar experiments carried out by other authors. It gives findings and conclusions on the sufficiency of the proposed approach. The obtained information confirms the sufficiency of applying the neural networks of adaptive resonant theory to analyze network traffic within the intrusion detection system
Improved implementation and modeling of deadtime reduction in an actively multiplexed detection system
No full text
Fatigue life and failure characteristics of an ultrafine-grained Ti-6Al-4V alloy processed by ECAP and extrusion
No full textJETP Letters V. 68, I .08
No full textJETP Letters -- October 25, 1998
Volume 68, Issue 8, pp. 629-684
FIELDS, PARTICLES, AND NUCLEI
Inhibition of the radioactive decay of the isomer 119mSn with the use of Mössbauer backscattering
S. K. Godovikov
Full Text: PDF (75 kB)
Predictions for the forward cone in diffractive deep inelastic scattering
N. N. Nikolaev, A. V. Pronyaev, and B. G. Zakharov
Full Text: PDF (131 kB)
ATOMS, SPECTRA AND RADIATION
Spontaneous emission from an atomic oscillator located near an ideally conducting conical surface
V. V. Klimov
Full Text: PDF (107 kB)
On resonance processes in near-threshold excitation of the resonance lines of a Zn+ ion in electron–ion collisions
A. I. Imre, A. N. Gomonai, V. S. Vukstich, and A. N. Nemet
Full Text: PDF (77 kB)
CONDENSED MATTER
Giant nonlinear optical activity in an aggregated silver nanocomposite
V. P. Drachev, S. V. Perminov, S. G. Rautian, and V. P. Safonov
Full Text: PDF (101 kB)
Low-temperature specific heat of crystalline and amorphous Eu2(MoO4)3
A. V. Pal'nichenko, E. G. Ponyatovskii, B. S. Red'kin, and V. V. Sinitsyn
Full Text: PDF (58 kB)
Self-excitation of 2D plasmons in resonant tunneling diodes
M. N. Feiginov and V. A. Volkov
Full Text: PDF (100 kB)
Magnetoexcitons in type-II quantum dots
A. B. Kalameitsev, V. M. Kovalev, and A. O. Govorov
Full Text: PDF (83 kB)
Mesoscopic superconductivity in superspace
A. F. Andreev
Full Text: PDF (101 kB)
MISCELLANEOUS
Fractal structure of the phase equilibrium curve of a system of two oscillating magnetic moments
F. V. Lisovskii and O. P. Polyakov
Full Text: PDF (82 kB)Archived web conten
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