Article
Physics, Particles & Fields
K. Boguslavski, A. Kurkela, T. Lappi, J. Peuron
Summary: This research focuses on the excitations of far-from-equilibrium 2+1 dimensional gauge theories and finds that their structure is nontrivial and nonperturbative, leading to broad excitation peaks in spectral and statistical correlation functions. The absence of soft quasiparticles in these theories is demonstrated by the comparable width of these peaks to the frequency of soft excitations.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Marco Ce, Tim Harris, Harvey B. Meyer, Arianna Toniato
Summary: The article interprets the structure functions of a thermal medium in terms of electron scattering and exchange of spacelike photons, focusing on deep-inelastic scattering and moment sum rules obeyed by the structure functions. It discusses the thermal expectation value of twist-two operators computable in lattice QCD, as well as how lattice QCD calculations can probe the virtuality required for Bjorken scaling. Moreover, it provides a parton-model interpretation of structure functions in the Bjorken limit and tests its consistency.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Alex Buchel
Summary: In this study, we use N = 2* and cascading gauge theory holographic models to investigate the gravitational susceptibility of strongly coupled nonconformal quark-gluon plasma. We find that in theories with a relevant coupling constant, the gravitational susceptibility depends on the renormalization scheme. To overcome this issue, we propose using the temperature derivative of the susceptibility, d kappa/dlnT, as a scheme-independent characteristic of quark-gluon plasma. Furthermore, we show that the critical behavior of kappa can vary significantly near seemingly identical thermal phase transitions.
Article
Physics, Particles & Fields
Xiaojun Yao, Thomas Mehen
Summary: This study investigates quarkonium transport in a quark-gluon plasma, deriving a semiclassical Boltzmann equation and discussing the centrality and momentum dependence of the reaction rates. The research also explores ways to indirectly constrain the quarkonium in-medium real potential and quantum corrections to the semiclassical transport equation, which can be applied to understand quarkonium transport in cold nuclear matter.
JOURNAL OF HIGH ENERGY 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
Physics, Particles & Fields
Tolga Domurcukgul, Razieh Morad
Summary: In this study, the dynamics of a moving heavy quark in a strongly coupled, non-conformal plasma were investigated using the gauge/string duality. It was found that the drag force in this non-conformal model is smaller and decreases as the level of non-conformality increases.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
D. Banerjee, S. Datta, M. Laine
Summary: This study investigates the Brownian motion of heavy quarks in a hot QCD medium and the corresponding transport coefficients. By expanding the transport coefficients of heavy quarks and considering the color-electric and color-magnetic effects, the spectral function is calculated.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Nuclear
Sergei Nedelko, Aleksei Nikolskii
Summary: This study investigates the photon production resulting from the conversion of two gluons into a photon (gg ? ?) in the presence of background gauge fields using mean-field approach to QCD vacuum. The confinement phase is represented by an ensemble of almost everywhere homogeneous abelian (anti-)self-dual gluon configurations, while the deconfined phase is characterized by purely chromomagnetic fields. In the confinement phase, the probability of gluon conversion into a photon is zero due to the randomness of the background field configurations. However, in the deconfined phase with the presence of an anisotropic purely chromomagnetic mean field, there is a nonzero probability of gluon conversion into a photon with strongly anisotropic angular distribution.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Particles & Fields
M. Laine
Summary: The study of the diffusion and kinetic equilibration of heavy quarks within a hot QCD medium benefits from understanding the coloured Lorentz force acting on them. By determining 1-loop matching coefficients for the electric and magnetic parts of a Lorentz force, it enables a lattice study of a color-magnetic 2-point correlator.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Mattia Dalla Brida, Leonardo Giusti, Tim Harris, Davide Laudicina, Michele Pepe
Summary: This study presents a strategy based on the step-scaling technique to nonperturbatively study thermal QCD up to very high temperatures, specifically focusing on computing flavour non-singlet meson screening masses in a theory with three massless quarks. Chiral symmetry restoration is observed in the results, with deviations in meson screening masses not explained by the known leading term in the QCD coupling constant g. The research findings provide insight into the difficulties in matching non-perturbative lattice results at lower temperatures with the behavior at asymptotically high temperatures.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Kirill Boguslavski, Babak S. Kasmaei, Michael Strickland
Summary: In this study, the imaginary part of the heavy-quark potential was extracted using classical-statistical simulations, with comparisons made to continuum expressions and lattice perturbation theory calculations. The results showed little sensitivity to lattice spacing at small values of a certain variable, and quantified non-perturbative long-range corrections for large quark-antiquark separations. This work laid the groundwork for extracting the imaginary part of the heavy-quark potential in expanding non-equilibrium Yang-Mills plasma.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Shirley Weishi Li, Peter Lowdon, Orlando Oliveira, Paulo J. Silva
Summary: The existence of BRST symmetry in non-perturbative QCD imposes constraints on the ghost and gluon spectra, but this interconnection is violated in actual data, indicating that continuum and current lattice formulations in Landau gauge represent two distinct realisations of Yang-Mills theory.
Article
Physics, Particles & Fields
Varun Vaidya
Summary: The author developed an Effective Field Theory (EFT) framework to compute jet substructure observables for heavy ion collision experiments, focusing on a dijet system accompanying the formation of a weakly coupled long lived Quark Gluon Plasma (QGP) medium. By treating the jet as an open quantum system, the author derived a factorization formula within the SCET framework to study the evolution and interaction of the jet within the medium. This factorization formula led to a Lindblad type equation for the reduced density matrix of the jet, allowing a resummation of large logarithms and summing over multiple incoherent interactions with the medium.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Zhi-Fu Deng, Wei Wang, Jun Zeng
Summary: In this study, the TMD factorization of the form factor is proved using expansion by regions, and O(alpha(s)) perturbative corrections to the hard functions are calculated. The effects from the one-loop matching kernel are estimated using lattice data on quasi-TMDWFs.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Max Jaarsma, Rudi Rahn, Wouter J. Waalewijn
Summary: Double parton scattering (DPS) plays a significant role in precision measurements, especially in processes like same-sign WW production. The effect of DPS is usually considered through Monte Carlo parton showers. However, the understanding of double parton distributions (DPDs) is currently limited. In this study, we propose the use of the Large Momentum Effective Theory approach to investigate DPDs and present a general matching relation between DPDs and lattice-calculable quasi-DPDs.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Joonas Hirvonen, Johan Lofgren, Michael J. Ramsey-Musolf, Philipp Schicho, Tuomas V. Tenkanen
Summary: This article presents a gauge-invariant framework for computing bubble nucleation rates at finite temperature in the presence of radiative barriers. The approach is illustrated using the Abelian Higgs Model and is subsequently recast in the dimensionally-reduced high-temperature effective field theory. This approach allows for robust perturbative treatments of bubble nucleation during possible first-order cosmic phase transitions and provides a sound comparison between perturbative and non-perturbative computations.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Simone Biondini, Philipp Schicho, Tuomas V. I. Tenkanen
Summary: Beyond the Standard Model physics needs to explain both dark matter and the baryon asymmetry of the universe. We study a next-to-minimal dark matter model containing an inert Majorana fermion and Standard Model leptons, and link the phase transition thermodynamics with the dark matter energy density to determine the parameter space that can explain the observed dark matter energy density and allow for a first-order phase transition.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Particles & Fields
Philipp Schicho, Tuomas V. Tenkanen, Graham White
Summary: We discuss a minimal approach for computing the thermodynamics of the electroweak phase transition, which takes into account both gauge invariance and thermal resummation. This approach involves a two-loop dimensional reduction to a three-dimensional effective theory, a one-loop computation of the effective potential, and an expansion around the leading-order minima within the effective theory. We show that this approach is tractable and provides formulae for resummation that are comparable to standard techniques. We present this approach in the context of the complex singlet extension of the Standard Model and discuss its potential applications in collider phenomenology and dark matter predictions.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Jacopo Ghiglieri, Eamonn Weitz
Summary: This article discusses corrections to the transverse momentum broadening coefficient, including soft, classical and radiative, quantum corrections. The study finds that a thermal population of dynamical gluons changes the boundaries and reduces the size of the double-logarithmic phase space, and provides new subdominant logarithmic corrections. It also shows the smooth connection between the quantum, double-logarithmic and classical, soft phase spaces.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Johan Lofgren, Michael J. Ramsey-Musolf, Philipp Schicho, Tuomas V. I. Tenkanen
Summary: We propose a gauge-invariant framework for bubble nucleation in theories with radiative symmetry breaking at high temperature. This perturbative framework provides a practical and gauge-invariant computation of the leading order nucleation rate, using a consistent power counting in the high-temperature expansion. It has important applications in model building, particle phenomenology, including the calculation of bubble nucleation temperature, the rate for electroweak baryogenesis, and gravitational wave signals from cosmic phase transitions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Ophthalmology
Christoph Lwowski, Klemens Paul Kaiser, Julian Bucur, Philipp Schicho, Thomas Kohnen
Summary: Using the axial length of the fellow eye for intraocular lens (IOL) calculation in eyes with retinal detachment significantly decreases the predictability of IOL power. Using the axial length of the silicone oil filled eye after initial vitrectomy yields better postoperative refractive results. A two-step procedure incorporating the axial length of the operated eye after retina reattachment is highly recommended.
BRITISH JOURNAL OF OPHTHALMOLOGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Andreas Ekstedt, Philipp Schicho, Tuomas V. I. Tenkanen
Summary: DRalgo is an algorithmic implementation for constructing an efficient, dimensionally reduced, high-temperature field theory. The corresponding Mathematica package automatically matches to next-to-leading order, including two-loop thermal corrections and one-loop thermal corrections for couplings. DRalgo also allows integrating out heavy scalars and provides leading-order beta functions for general gauge-charges and fermion-families. It computes the finite-temperature effective potential within the effective theory. The article explains the theory while introducing the software on a pedagogical level.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Astronomy & Astrophysics
Tyler Gorda, Aleksi Kurkela, Juuso Oesterman, Risto Paatelainen, Saga Saeppi, Philipp Schicho, Kaapo Seppaenen, Aleksi Vuorinen
Summary: We have calculated the pressure of a cold and dense electron gas to a nearly complete N3LO in the fine-structure constant alpha e, using a new result for the two-loop photon self-energy. Our result includes all infrared-sensitive contributions to the pressure at this order, and only leaves a single undetermined coefficient associated with the contributions of unresummed hard momenta. We have also demonstrated the complete cancellation of infrared divergences according to the effective-field-theory paradigm by determining part of the hard contributions at this order.
Article
Astronomy & Astrophysics
Tyler Gorda, Aleksi Kurkela, Juuso Osterman, Risto Paatelainen, Saga Sappi, Philipp Schicho, Kaapo Seppanen, Aleksi Vuorinen
Summary: We have made the first complete calculation of the soft photon self-energy in QED in a hot and/or dense ultrarelativistic plasma, to next-to-leading order. The calculation utilizes dimensional regularization in 4-2 epsilon dimensions and reports the result including explicit O(epsilon) terms in the zero-temperature limit. This information is crucial for extending the perturbative calculation of the pressure in cold and dense QED matter to partial next-to-next-to-next-to-leading order in a weak-coupling expansion, as discussed in a companion paper. These results will pave the way for a similar future calculation in quantum chromodynamics.
Article
Astronomy & Astrophysics
Simon Caron-Huot, Guy D. Moore
Summary: We demonstrate that in relativistic field theories, the thermal correlation function of N bosonic operators exhibits exponentially weak dependence on the time variables when the space separations are held constant. Moreover, in classical thermal field theory, the time dependence disappears when all points are spacelike separated.
Article
Astronomy & Astrophysics
Luis Altenkort, Alexander M. Eller, O. Kaczmarek, Lukas Mazur, Guy D. Moore, Hai-Tao Shu
Summary: The proposed method significantly improves the signal-to-noise ratio of lattice correlation functions for bosonic operators by breaking each plane into bins and computing bin-bin correlations. Experimental results show noise reductions of around 3-7 times compared to the conventional approach on the same ensemble of configurations.
Article
Astronomy & Astrophysics
Yu Fu, Jacopo Ghiglieri, Shahin Iqbal, Aleksi Kurkela
Summary: We provide the first NLO weak-coupling description of the thermalization process in non-Abelian gauge theory and study the time evolution of isotropic systems towards thermal equilibrium. Numerical solutions of the QCD effective kinetic theory show that the NLO corrections reduce the time needed to reach thermal equilibrium.
