Browsing Vitenskapelige publikasjoner (IMF) by Title
Now showing items 105-124 of 179
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No room to hide: implications of cosmic-ray upscattering for GeV-scale dark matter
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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 ... -
Porous flow with diffuse interfaces
(Chapter, 2021)This chapter presents a model developed by the author, in publications dated from 2002 to 2016, on flow in porous media assuming diffuse interfaces. It contains five sections. Section 1 is an Introduction, tracing the ... -
Predicting parton energy loss in small collision systems
(Peer reviewed; Journal article, 2021)Medium induced parton energy loss is not conclusively established either in very peripheral heavy-ion collisions or in proton-ion collisions. However, the standard interpretation of azimuthal momentum anisotropies in these ... -
Prevalence of bradycardia in 4876 newborns in the first minute after birth and association with positive pressure ventilation: A population-based cross-sectional study
(Peer reviewed; Journal article, 2023)Objective To determine the prevalence of bradycardia in the first minute after birth and association with positive pressure ventilation (PPV). Method A population-based cross-sectional study was conducted from June 2019 ... -
Proper static potential in classical lattice gauge theory at finite T
(Peer reviewed; Journal article, 2021)We compute the proper real-time interaction potential between a static quark and antiquark in classical lattice gauge theory at finite temperature. Our central result is the determination of the screened real-part of this ... -
Pulsar timing array stochastic background from light Kaluza-Klein resonances
(Peer reviewed; Journal article, 2023-11)We investigate the potential of the warped extradimension framework as an explanation for the recently observed stochastic gravitational background at nHz frequencies in pulsar timing arrays (PTA). Our analysis reveals ...