Article
Multidisciplinary Sciences
Huda Alalawi, Mubarak Alqahtani, Michael Strickland
Summary: This review presents the motivation for using relativistic anisotropic hydrodynamics to study the physics of ultrarelativistic heavy-ion collisions and highlights the main ingredients of the 3+1D quasiparticle anisotropic hydrodynamics model, as well as phenomenological comparisons with experimental data.
Article
Physics, Nuclear
Sigtryggur Hauksson, Sangyong Jeon, Charles Gale
Summary: The sensitivity of penetrating probes in heavy-ion collisions to the transport coefficients of quark-gluon plasma requires a detailed understanding of photon emission and jet-medium interaction in a nonequilibrium plasma. Accounting for the time evolution of an unstable plasma can cure spurious divergences when evaluating the rate of interaction of hard probes with the plasma. The exponential growth of gluon occupation density in an unstable plasma may suggest a phenomenological prescription where instability poles are subtracted. Additionally, instability fields do not seem to affect medium-induced photon emission in the Abelian case to the examined approximation level.
Article
Astronomy & Astrophysics
Xiaojian Du, Ralf Rapp
Summary: This paper investigates the quarkonium regeneration in ultrarelativistic heavy-ion collisions and proposes a semi-classical charmonium transport approach. The study finds that a good description of the measured J/psi yield and its transverse-momentum dependence can be achieved if a large K >= 5 is employed.
Article
Astronomy & Astrophysics
Daniel Avila, Francisco Nettel, Leonardo Patino
Summary: We expand our holographic analysis to study the emission of photons in a strongly coupled plasma under a very intense external magnetic field. By relaxing certain constraints, we demonstrate that photons can have either out-plane or in-plane polarization. Our calculations and numerical results complement our previous findings, showing that the introduction of a nonvanishing magnetic field can increase photon production up to a certain intensity, beyond which the effect is reversed. This magnetic field also increases the elliptic flow, providing a possible explanation for excess measured in collision experiments.
Article
Physics, Multidisciplinary
Konrad Merkel, Valentin Link, Kimmo Luoma, Walter T. Strunz
Summary: This article investigates the driven dissipative quantum dynamics of an ensemble of two-level systems, showing the possibility of interpolating between mean field theory and finite system size by exploiting permutation symmetry and a phase space approach. It also reveals that in certain parameter regimes, the evolution equation for the corresponding quasiprobability distribution resembles a Fokker-Planck equation, which can be efficiently solved by stochastic calculus. The results demonstrate classical-like dynamics with no entanglement generation between the two-level systems, utilizing and promoting techniques pioneered in the context of laser theory as powerful tools for investigating current theoretical and experimental problems.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2021)
Review
Physics, Nuclear
Y. Akamatsu
Summary: This review discusses the dissociation of quarkonium and quantum Brownian motion in quark-gluon plasma (QGP), providing a unified framework by systematically rederiving existing master equations as Lindblad equations. It also highlights the potential of quarkonium yields in determining fundamental quantities of QGP.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2022)
Article
Automation & Control Systems
Manuel Lanchares, Wassim M. Haddad
Summary: Dissipative dynamical systems provide connections between physics, dynamical systems theory, and control science and engineering. Dissipativity theory has been extensively developed in the literature for the analysis and design of control systems based on generalized system energy considerations. Recently, there have been efforts to extend dissipativity notions to stochastic dynamical systems.
SYSTEMS & CONTROL LETTERS
(2023)
Article
Astronomy & Astrophysics
Christopher Grayson, Martin Formanek, Johann Rafelski, Berndt Mueller
Summary: In this study, we investigate the electromagnetic response of a viscous quark-gluon plasma using the relativistic Boltzmann equation. By considering the linear response of the electromagnetic field and the complete spatial and temporal dependence of the perturbing fields, we derive an analytic expression for the magnetic field between two colliding nuclei.
Article
Physics, Multidisciplinary
Yogesh Kumar, S. S. Singh, Poonam Jain
Summary: This study focuses on revealing information about the space-time evolution of quark gluon plasma (QGP) through the analysis of experimental data on electromagnetic probes emitted from hot and dense matter. The results show a significant enhancement in diphoton production rate when using thermal quark mass compared to dynamic quark mass. These insights can be useful for spectroscopy and thermometry in high-energy heavy-ion collisions at RHIC and LHC, providing valuable information for the relevant mass range.
Article
Physics, Multidisciplinary
Constantia Alexandrou, Simone Bacchio, Georg Bergner, Jacob Finkenrath, Andrew Gasbarro, Kyriakos Hadjiyiannakou, Karl Jansen, Bartosz Kostrzewa, Konstantin Ottnad, Marcus Petschlies, Ferenc Pittler, Fernanda Steffens, Carsten Urbach, Urs Wenger
Summary: This study presents the first full decomposition of the pion momentum into its gluon and quark contributions. The results show that the sum of separate contributions satisfies the momentum sum rule.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Baoyi Chen, Liuyuan Wen, Yunpeng Liu
Summary: In this study, we investigated the production of B-c(+) in Pb-Pb collisions at root s(NN)=5.02TeV. We found that the non-equilibrium distribution of heavy quarks in the quark-gluon plasma and the enhanced coalescence probability of charm and bottom quarks led to an increased production of B+c, resulting in a nuclear modification factor (R-AA) of B-c(+) greater than unity.
Article
Physics, Particles & Fields
Masaru Hongo, Xu-Guang Huang, Matthias Kaminski, Mikhail Stephanov, Ho-Ung Yee
Summary: We calculate the relaxation rate of the spin density of heavy quarks in a perturbative QCD plasma and demonstrate the differences between three different methods of calculation, while finding that the relaxation rate of the spin is smaller than that of other non-hydrodynamic modes in the heavy-quark limit.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Stefan Floerchinger, Charlotte Gebhardt, Klaus Reygers
Summary: Fluid dynamic considerations are used to determine the electric current spectral density in the regime of small energies and momenta. The spectral density in this regime is parameterized by the electric conductivity, the charge susceptibility, and the relaxation time for the electric current, which is needed for relativistic causality. Experimentally, the spectral function can be accessed through the production rates of photons and dileptons in the expanding quark-gluon plasma. We discuss how experiments can constrain the electrical conductivity and associated relaxation time of the quark-gluon plasma.
Article
Optics
Fatemeh Bibak, Uros Delic, Markus Aspelmeyer, Borivoje Dakic
Summary: We demonstrate that optomechanical quantum systems can undergo dissipative phase transitions when the nonlinear interaction is small and the external drive is strong. In such defined thermodynamical limit, the nonlinear interaction stabilizes the optomechanical dynamics in strong and ultrastrong-coupling regimes. As a result, optomechanical systems exhibit a rich phase diagram with periodic orbits and discontinuous and continuous dissipative phase transitions with and without bifurcation. We also identify a critical point where continuous and discontinuous dissipative phase transition lines intersect. Our analysis highlights the importance of optomechanical systems in understanding the physics of dissipative phase transitions and ultrastrong-coupling regimes.
Article
Physics, Particles & Fields
B. G. Zakharov
Summary: The study finds that the radiative contribution to p⊥ broadening of fast partons in an expanding quark-gluon plasma may be negative and comparable in absolute value with the non-radiative contribution in AA collisions at RHIC and LHC. Additionally, it is discovered that the expansion of the QGP enhances the radiative suppression of p⊥ broadening compared to a static medium.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Management
Felix Lauton, Alexander Rothkopf, Richard Pibernik
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
(2019)
Article
Physics, Nuclear
Shiori Kajimoto, Yukinao Akamatsu, Masayuki Asakawa, Alexander Rothkopf
Article
Physics, Nuclear
Brandon Krouppa, Alexander Rothkopf, Michael Strickland
Article
Physics, Nuclear
P. Petreczky, A. Rothkopf, J. Weber
Article
Physics, Particles & Fields
Joseph Karpie, Kostas Orginos, Alexander Rothkopf, Savvas Zafeiropoulos
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
N. Yu. Astrakhantsev, V. G. Bornyakov, V. V. Braguta, E. -M. Ilgenfritz, A. Yu. Kotov, A. A. Nikolaev, A. Rothkopf
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Astronomy & Astrophysics
David Lafferty, Alexander Rothkopf
Article
Astronomy & Astrophysics
Alexander Rothkopf
Review
Physics, Multidisciplinary
Alexander Rothkopf
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2020)
Article
Computer Science, Interdisciplinary Applications
Oskar Alund, Yukinao Akamatsu, Fredrik Lauren, Takahiro Miura, Jan Nordstrom, Alexander Rothkopf
Summary: A novel numerical scheme for dissipative quantum dynamics is developed in this study, which exactly preserves the trace of the density matrix and shows only mild deviations from hermiticity and positivity. The central ingredient is a spatial difference operator that fulfills the SBP property and implements a continuum reparametrization property for accurate simulation of open quantum system dynamics.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Physics, Particles & Fields
Alexander Lehmann, Alexander Rothkopf
Summary: The paper computes the real-time interaction potential between a static quark and antiquark in classical lattice gauge theory at finite temperature and determines the screened real part of this potential while confirming the presence of an imaginary part. The real part is closely related to the back-reaction of static sources onto the gauge fields, which is incorporated via Gauss's law. Differences in the treatment of static sources in quantum and classical lattice gauge theory are also discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Computer Science, Information Systems
Alexander Rothkopf
Article
Astronomy & Astrophysics
David Lafferty, Alexander Rothkopf
Article
Astronomy & Astrophysics
Takahiro Miura, Yukinao Akamatsu, Masayuki Asakawa, Alexander Rothkopf
Proceedings Paper
Business
Fabian Taigel, Jan Meller, Alexander Rothkopf
ADVANCES IN SERVICE SCIENCE
(2019)