Browsing Department of Mathematics and Physics (TN-IMF) by Subject "VDP::Matematikk og Naturvitenskap: 400"

Now showing items 41-59 of 59

    • Order parameter dynamics of the non-linear sigma model in the large N limit 

      Gemsheim, Sebastian; Mandal, Ipsita; Sengupta, Krishnendu; Wang, Zhiqiang (Peer reviewed; Journal article, 2020)
      We study non-equilibrium order parameter dynamics of the non-linear sigma model in the large N limit, using Keldysh formalism. We provide a scheme for obtaining stable numerical solution of the Keldysh saddle point equations ...

    • Perturbative thermal QCD: Formalism and applications 

      Ghiglieri, Jacopo; Kurkela, Aleksi; Strickland, Michael; Vuorinen, Aleksi (Peer reviewed; Journal article, 2020)
      In this review article, we discuss the current status and future prospects of perturbation theory as a means of studying the equilibrium thermodynamic and near-equilibrium transport properties of deconfined QCD matter. We ...

    • Quantum corrections to slow-roll inflation: scalar and tensor modes 

      Andersen, Jens Oluf; Eriksson, Magdalena Britt; Tranberg, Anders (Peer reviewed; Journal article, 2021)
      Inflation is often described through the dynamics of a scalar field, slow-rolling in a suitable potential. Ultimately, this inflaton must be identified with the expectation value of a quantum field, evolving in a quantum ...

    • Quench, thermalization, and residual entropy across a non-Fermi liquid to Fermi liquid transition 

      Haldar, Arijit; Haldar, Prosenjit; Bera, Surajit; Mandal, Ipsita; Banerjee, Sumilan (Peer reviewed; Journal article, 2020)
      We study the thermalization, after sudden and slow quenches, in an interacting model having a quantum phase transition from a Sachdev-Ye-Kitaev (SYK) non-Fermi liquid (NFL) to a Fermi liquid (FL). The model has SYK fermions ...

    • Real-time quantum dynamics, path integrals and the method of thimbles 

      Mou, Zonggang; Saffin, Paul M.; Tranberg, Anders; Woodward, Simon (Peer reviewed; Journal article, 2019)
      Direct numerical evaluation of the real-time path integral has a well-known sign problem that makes convergence exponentially slow. One promising remedy is to use Picard-Lefschetz theory to flow the domain of the field ...

    • Realistic in-medium heavy-quark potential from high statistics lattice QCD simulations 

      Petreczky, Peter; Rothkopf, Alexander Karl; Weber, Johannes Heinrich (Peer reviewed; Journal article, 2019)
      We present our first results on a direct computation of the complex in-medium heavy quark potential from realistic lattice QCD simulations. Ensembles with Nτ = 12 from the HotQCD and TUMQCD collaboration offer unprecedented ...

    • Reconstructing parton distribution functions from Ioffe time data: from Bayesian methods to Neural Networks 

      Karpie, Joseph; Orginos, Kostas; Rothkopf, Alexander Karl; Zafeiropoulos, Savvas (Peer reviewed; Journal article, 2019)
      The computation of the parton distribution functions (PDF) or distribution amplitudes (DA) of hadrons from first principles lattice QCD constitutes a central open problem. In this study, we present and evaluate the efficiency ...

    • The role of initial state radiation in quenched jets 

      Zapp, Korinna Christine (Peer reviewed; Journal article, 2022)
      Jet quenching in heavy ion collisions and in particular the sub-structure of quenched jets are promising tools for investigating the microscopic processes underlying jet quenching and the background medium's response to ...

    • Science AMA Series: Ask the Society of Environmental Toxicology and Chemistry (SETAC) anything about Pharmaceuticals in the environment! 

      Opsahl, Eystein (Journal article, 2017)
      The Society of Environmental Toxicology and Chemistry (SETAC) is hosting the SETAC North America 38th annual meeting this week and we have tied this AMA to a specific session, “Pharmaceuticals in the environment: Potential ...

    • Shape Statistics via Skeletal Structures 

      Taheri, Mohsen (PhD thesis UiS; 781, Doctoral thesis, 2024)
      Statistical shape analysis has emerged as a crucial tool for medical researchers and clinicians to study medical objects such as brain subcortical structures. The insights gained from such analyses hold immense potential ...

    • Spectral function for overoccupied gluodynamics from classical lattice simulations 

      Boguslavski, Kirill; Kurkela, Aleksi; Lappi, Tuomas; Peuron, Jarkko (Peer reviewed; Journal article, 2019)
      We study the spectral properties of an overoccupied gluonic system far from equilibrium. Using classical Yang–Mills simulations and linear response theory, we determine the statistical and spectral functions. We measure ...

    • Spontaneous momentum dissipation and coexistence of phases in holographic Horndeski theory 

      Filios, Georgios; Gonzalez, P. A.; Kuang, Xiao-Mei; Papantonopoulos, Eleftherios; Vasquez, Yerko (Peer reviewed; Journal article, 2019)
      We discuss the possible phases dual to the AdS hairy black holes in Horndeski theory. In the probe limit breaking the translational invariance, we study the conductivity and we find a nontrivial structure indicating a ...

    • Static quark-antiquark interactions at nonzero temperature from lattice QCD 

      Bala, Dibyendu; Kaczmarek, Olaf; Larsen, Rasmus Normann; Mukherjee, Swagato; Parkar, Gaurang Yatin; Petreczky, Peter; Rothkopf, Alexander Karl; Weber, Johannes Heinrich (Peer reviewed; Journal article, 2022)
      flavor lattice QCD calculations. The study consists of two parts. The first investigates the properties of Wilson line correlators in Coulomb gauge and compares to predictions of hard-thermal loop perturbation theory. As ...

    • Statistical Shape Analysis of Brain Structures 

      Taheri Shalmani, Mohsen (Masteroppgave/UIS-TN-IMF/2020;, Master thesis, 2020-06)
      The purpose of this work is to study structural differences of the left hippocampus between patients with Parkinson's disease (PD) and healthy control group (CG) based on shape models like skeletal representation (s-rep) ...

    • Stochastic Epidemic Models on Complex Network 

      Osei, Francis (Masteroppgave/UIS-HF-IMF/2019;, Master thesis, 2020-06-14)
      The spread of a virus or the outbreak of an epidemic are natural examples of stochastic processes. Classical mathematical descriptions of such phenomenon include various branching processes such as the SIR (Susceptible-I ...

    • A study of inhomogeneous massless scalar gauge fields in cosmology 

      Normann, Ben David; Ricciardone, Angelo; Hervik, Sigbjørn; Thorsrud, Mikjel (Peer reviewed; Journal article, 2022)
      Why is the Universe so homogeneous and isotropic? We summarize a general study of a γ-law perfect fluid alongside an inhomogeneous, massless scalar gauge field (with homogeneous gradient) in anisotropic spaces with General ...

    • Symmetric teleparallel geometries 

      Coley, Alan; van den Hoogen, Robert; McNutt, David Duncan (Peer reviewed; Journal article, 2022)
      In teleparallel gravity and, in particular, in F(T) teleparallel gravity, there is a challenge in determining an appropriate (co-)frame and its corresponding spin connection to describe the geometry. Very often, the ‘proper’ ...

    • Thermalization of non-Abelian gauge theories at next-to-leading order 

      Fu, Yu; Ghiglieri, Jacopo; Iqbal, Shahin; Kurkela, Eero Aleksi (Peer reviewed; Journal article, 2022)
      We provide the first next-to-leading-order (NLO) weak-coupling description of the thermalization process of far-from-equilibrium systems in non-Abelian gauge theory. We study isotropic systems starting from either over- ...

    • X-ray Studies on partially decomposed γ- Mg(BH4)2 

      Dahal, Rashmi (Masteroppgave/UIS-TN-IMF/2020;, Master thesis, 2020-07-15)
      Hydrogen is the energy that fuels the sun and the stars. Having the potential to be zero-carbon during production, when produced by renewable resources, it is an attractive carrier of the pollution-free renewable energy. ...