Blar i Department of Mathematics and Physics (TN-IMF) på emneord "VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430"
Viser treff 21-40 av 88
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Early- and Late-Time Behavior of Attractors in Heavy-Ion Collisions
(Peer reviewed; Journal article, 2020)Whether, how, and to what extent solutions of Bjorken-expanding systems become insensitive to aspects of their initial conditions is of importance for heavy-ion collisions. Here we study 1+1D and phenomenologically relevant ... -
Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals
(Peer reviewed; Journal article, 2020-06)The circular photogalvanic effect (CPGE) is the photocurrent generated in an optically active material in response to an applied AC electric field, and it changes sign depending on the chirality of the incident circularly ... -
The effect of mission duration on LISA science objectives
(Peer reviewed; Journal article, 2022)The science objectives of the LISA mission have been defined under the implicit assumption of a 4-years continuous data stream. Based on the performance of LISA Pathfinder, it is now expected that LISA will have a duty ... -
Evidence for quark-matter cores in massive neutron stars
(Peer reviewed; Journal article, 2020-06)The theory governing the strong nuclear force—quantum chromodynamics—predicts that at sufficiently high energy densities, hadronic nuclear matter undergoes a deconfinement transition to a new phase of quarks and gluons1. ... -
Exact Solutions of the Field Equations for Empty Space in the Nash Gravitational Theory
(Journal article; Peer reviewed, 2017-02)John Nash has proposed a new theory of gravity. We define a Nash-tensor equal to the curvature tensor appearing in the Nash field equations for empty space, and calculate its components for two cases: 1. A static, spherically ... -
The experimental and theoretical investigation of single-crystal diamond compound refractive lenses (CRLs)
(PhD theses (TN-IMF);527, Doctoral thesis, 2020-06)In the field of X-ray optics, compound refractive lenses (usually termed CRLs) function as a focusing device for hard X-rays and they are believed to possess a lot of prominent advantages over other focusing devices, such ... -
Fast and robust Bayesian inference using Gaussian processes with GPry
(Peer reviewed; Journal article, 2023)We present the GPry algorithm for fast Bayesian inference of general (non-Gaussian) posteriors with a moderate number of parameters. GPry does not need any pre-training, special hardware such as GPUs, and is intended as a ... -
Firewall black holes and echoes from an action principle
(Peer reviewed; Journal article, 2023)It is often said that there is no gravity theory based on local action principles giving rise to firewall black hole solutions. Additionally, Guo and Mathur [Int. J. Mod. Phys. D 31, 2242009 (2022).] have cast doubt on the ... -
From Symmetries to Scattering Amplitudes: A Lie-algebraic categorisation of symmetry-breaking patterns that create enhanced soft limits for NG bosons
(PhD thesis UiS;, Doctoral thesis, 2022-11)The standard calculation of scattering amplitudes in quantum field theory is carried out using a perturbative expansion, that at successive orders contains an escalating number of terms to calculate. The amplitudes depend ... -
Gauging discrete symmetries of TN-theories in five dimensions
(Peer reviewed; Journal article, 2022)We study the gauging of a discrete ℤ3 symmetry in the five-dimensional superconformal TN theories. We argue that this leads to an infinite sequence of five-dimensional superconformal theories with either E6 × SU(N) or SU(3) ... -
Gravitational imprints from heavy Kaluza-Klein resonances
(Peer reviewed; Journal article, 2020)We systematically study the holographic phase transition of the radion field in a five-dimensional warped model which includes a scalar potential with a powerlike behavior. We consider Kaluza-Klein (KK) resonances with ... -
Heavy quark diffusion in an overoccupied gluon plasma
(Peer reviewed; Journal article, 2020-09)We extract the heavy-quark diffusion coefficient κ and the resulting momentum broadening 〈p2〉 in a far-from-equilibrium non-Abelian plasma. We find several features in the time dependence of the momentum broadening: a short ... -
A Heterotic Kodaira--Spencer Theory at One-Loop
(Peer reviewed; Journal article, 2023-10)We consider a heterotic version of six-dimensional Kodaira-Spencer gravity derived from the heterotic superpotential. We compute the one-loop partition function and find it can be expressed as a product of holomorphic ... -
Heterotic quantum cohomology
(Peer reviewed; Journal article, 2022-11)It is believed, but not demonstrated, that the large radius massless spectrum of a heterotic string theory compactified to four-dimensional Minkowski space should obey equations that split into ‘F-terms’ and ‘D-terms’ in ... -
Highly occupied gauge theories in 2+1 dimensions: A self-similar attractor
(Peer reviewed; Journal article, 2019-11)Motivated by the boost-invariant Glasma state in the initial stages in heavy-ion collisions, we perform classical-statistical simulations of SU(2) gauge theory in 2+1 dimensional space-time both with and without a scalar ... -
Hydrodynamization in systems with detailed transverse profiles
(Peer reviewed; Journal article, 2020)The observation of fluid-like behavior in nucleus-nucleus (AA), proton-nucleus (pA) and high-multiplicity proton-proton (pp) collisions motivates systematic studies of how different measurements approach their fluid-dynamic ... -
Identification of the flux function of nonlinear conservation laws with variable parameters
(Peer reviewed; Journal article, 2023-09)Machine learning methods have in various ways emerged as a useful tool for modeling the dynamics of physical systems in the context of partial differential equations (PDEs). Nonlinear conservation laws (NCLs) of the form ... -
In medium static quark anti-quark potential from lattice QCD
(PhD thesis UiS; 775, Doctoral thesis, 2024)In this thesis we present recent progress in the quest to study the properties of the quark gluon plasma in relativistic heavy ion collisions through a better understanding of the binding of heavy quark and anti-quark pairs ... -
In-medium kinetic theory of D mesons and heavy-flavor transport coefficients
(Peer reviewed; Journal article, 2022)We extend the kinetic theory of D mesons to accommodate thermal and off-shell effects due to the medium modification of the heavy-meson spectral functions. From the Kadanoff-Baym approach we derive the off-shell Fokker-Planck ... -
Invariant characterization of Szekeres models with positive cosmological constant
(Peer reviewed; Journal article, 2022-07)We present an invariant characterization of black holes in the Szekeres spacetime with positive cosmological constant. In the formation of the black holes, we locate geometric horizons, and show that they coincide with the ...