• New benchmarks in the modelling of X-ray atomic form factors 

      Thorkildsen, Gunnar (Peer reviewed; Journal article, 2023)
      Analytical representations of X-ray atomic form factor data have been determined. The original data, f0(s;Z), are reproduced to a high degree of accuracy. The mean absolute errors calculated for all s = sin θ/λ and Z values ...
    • New G2-conifolds in M-theory and their field theory interpretation 

      Svanes, Eirik Eik; Acharya, Bobby S.; Foscolo, Lorenzo; Najjar, Marwan (Peer reviewed; Journal article, 2021)
      A recent theorem of Foscolo-Haskins-Nordström [1] which constructs complete G2-holonomy orbifolds from circle bundles over Calabi-Yau cones can be utilised to construct and investigate a large class of generalisations of ...
    • New tests for trend in time censored recurrent event data 

      Lindqvist, Bo Henry; Kvaløy, Jan Terje (Peer reviewed; Journal article, 2024-01)
      We consider testing for trend in recurrent event data. More precisely, for such data we consider testing of the null hypothesis of data coming from a renewal process. The new tests are essentially obtained by considering ...
    • New tests for trend in time censored recurrent event data 

      Lindqvist, Bo Henry; Kvaløy, Jan Terje (Peer reviewed; Journal article, 2024)
      We consider testing for trend in recurrent event data. More precisely, for such data we consider testing of the null hypothesis of data coming from a renewal process. The new tests are essentially obtained by considering ...
    • A new variational discretization technique for initial value problems bypassing governing equations 

      Rothkopf, Alexander Karl; Nordström, Jan (Peer reviewed; Journal article, 2023-03)
      Motivated by the fact that both the classical and quantum description of nature rest on causality and a variational principle, we develop a novel and highly versatile discretization prescription for classical initial value ...
    • No room to hide: implications of cosmic-ray upscattering for GeV-scale dark matter 

      Alvey, James; Bringmann, Torsten; Kolesova, Helena (Peer reviewed; Journal article, 2023)
      The irreducible upscattering of cold dark matter by cosmic rays opens up the intriguing possibility of detecting even light dark matter in conventional direct detection experiments or underground neutrino detectors. The ...
    • Noether currents of locally equivalent symmetries 

      Brauner, Tomas (Peer reviewed; Journal article, 2020)
      Local symmetry transformations play an important role for establishing the existence and form of a conserved (Noether) current in systems with a global continuous symmetry. We explain how this fact leads to the existence ...
    • Nonequilibrium attractor in high-temperature QCD plasmas 

      Almaalol, Dekrayat; Kurkela, Aleksi; Strickland, Michael (Peer reviewed; Journal article, 2020)
      We establish the existence of a far-from-equilibrium attractor in weakly coupled gauge theory undergoing one-dimensional Bjorken expansion. We demonstrate that the resulting far-from-equilibrium evolution is insensitive ...
    • Nonperturbative analysis of the electroweak phase transition in the two Higgs doublet model 

      Andersen, Jens Oluf; Gorda, Tyler; Helset, Andreas; Niemi, Lauri; Tenkanen, Tuomas V.I.; Tranberg, Anders; Vuorinen, Aleksi; Weir, David J. (Journal article; Peer reviewed, 2018-11)
      We perform a nonperturbative study of the electroweak phase transition (EWPT) in the two Higgs doublet model (2HDM) by deriving a dimensionally reduced high-temperature effective theory for the model, and matching to known ...
    • Nonrelativistic effective field theories with enhanced symmetries and soft behavior 

      Mojahed, Martin Aria; Brauner, Tomas (Peer reviewed; Journal article, 2022)
      We systematically explore the landscape of nonrelativistic effective field theories with a local S-matrix and enhanced symmetries and soft behavior. The exploration is carried out using both conventional quantum field ...
    • On a class of integrable systems of Monge-Ampère type 

      Doubrov, Boris; Ferapontov, Eugene V.; Kruglikov, Boris; Novikov, Vladimir (Journal article; Peer reviewed, 2017-06)
      We investigate a class of multi-dimensional two-component systems of Monge-Ampère type that can be viewed as generalisations of heavenly type equations appearing in a self-dual Ricci-flat geometry. Based on the Jordan-Kronecker ...
    • On Universal Black Holes 

      Hervik, Sigbjørn; Ortaggio, Marcello (Peer reviewed; Journal article, 2020)
      Recent results on universal black holes in d dimensions are summarized. These are static metrics with an isotropy-irreducible homogeneous base space which can be consistently employed to construct solutions to virtually ...
    • On-shell recursion relations for nonrelativistic effective field theories 

      Mojahed, Martin Aria; Brauner, Tomas (Peer reviewed; Journal article, 2021-10)
      We derive on-shell recursion relations for nonrelativistic effective field theories (EFTs) with enhanced soft limits. The recursion relations are illustrated through analytic calculation of tree-level scattering amplitudes ...
    • Opacity dependence of elliptic flow in kinetic theory 

      Kurkela, Aleksi; Wiedemann, Urs Achim; Wu, Bin (Peer reviewed; Journal article, 2019-09)
      The observation of large azimuthal anisotropies vn in the particle spectra of proton–proton (pp) and proton–nucleus (pA) collisions challenges fluid dynamic interpretations of vn, as it remains unclear how small collision ...
    • Open-quantum-systems approach to in-medium heavy quarkonium dynamics 

      Rothkopf, Alexander Karl (Peer reviewed; Journal article, 2023)
      Heavy quarkonium continues to play a central role in the study of nuclear matter under extremes of temperature and density in relativistic heavy-ion collisions. In this talk I report on recent developments in the theoretical ...
    • Optimisation of Thimble simulations and quantum dynamics of multiple fields in real time 

      Woodward, Simon; Saffin, Paul M.; Mou, Zonggang; Tranberg, Anders (Peer reviewed; Journal article, 2022)
      We apply the Generalised Thimble approach to the computation of exact path integrals and correlators in real-time quantum field theory. We first investigate the details of the numerical implementation and ways of optimizing ...
    • 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 ...
    • Pion condensation and phase diagram in the Polyakov-loop quark-meson model 

      Adhikari, Prabal; Andersen, Jens Oluf; Kneschke, Patrick (Journal article; Peer reviewed, 2018-10)
      We use the Polyakov-loop extended two-flavor quark-meson model as a low-energy effective model for QCD to study the phase diagram in the μI–T planewhere μI is the isospin chemical potential. In particular, we focus on the ...
    • Pion condensation and QCD phase diagram at finite isospin density 

      Andersen, Jens Oluf; Adhikari, Prabal; Kneschke, Patrick (Journal article; Peer reviewed, 2019-09)
      We use the Polyakov-loop extended two-flavor quark-meson model as a low-energy effective model for QCD to study 1) the possibility of inhomogeneous chiral condensates and its competition with a homogeneous pion condensate ...