Browsing UiS Brage by Author "Andersen, Jens Oluf"
Now showing items 1-11 of 11
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Chiral and deconfinement transitions in a magnetic background using the functional renormalization group with the Polyakov loop
Andersen, Jens Oluf; Naylor, William; Tranberg, Anders (Journal article; Peer reviewed, 2014-04)We use the Polyakov loop coupled quark-meson model to approximate low energy QCD and present results for the chiral and deconfinement transitions in the presence of a constant magnetic background B at finite temperature T ... -
Chiral density wave versus pion condensation at finite density and zero temperature
Andersen, Jens Oluf (Journal article; Peer reviewed, 2018-04)The quark-meson model is often used as a low-energy effective model for QCD to study the chiral transition at finite temperature T, baryon chemical potential μB, and isospin chemical potential μI. We determine the parameters ... -
Inhomogeneous chiral condensate in the quark-meson model
Adhikari, Prabal; Andersen, Jens Oluf; Kneschke, Patrick (Journal article; Peer reviewed, 2017-07-24) -
Inhomogeneous chiral condensate in the quark-meson model
Adhikari, Prabal; Andersen, Jens Oluf; Kneschke, Patrick (Journal article, 2017)The two-flavor quark-meson model is used as a low-energy effective model for QCD to study inhomogeneous chiral condensates at finite baryon chemical potential μ B. The parameters of the model are determined by matching the ... -
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 ... -
On-shell parameter fixing in the quark-meson model
Adhikari, Prabal; Andersen, Jens Oluf; Kneschke, Patrick (Journal article; Peer reviewed, 2017-02)The quark-meson model is often used as an effective low-energy model for QCD to study the chiral transition at finite temperature T and baryon chemical potential μB. The parameters in the quark-meson model can be found by ... -
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 ... -
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 ... -
Stochastic inflation from quantum field theory and the parametric dependence of the effective noise amplitude
Andersen, Jens Oluf; Tranberg, Anders; Eriksson, Magdalena Britt (Peer reviewed; Journal article, 2022-02)The non-linear dynamics of long-wavelength cosmological fluctuations may be phrased in terms of an effective classical, but stochastic evolution equation. The stochastic noise represents short-wavelength modes that continually ... -
Two-flavor chiral perturbation theory at nonzero isospin: Pion condensation at zero temperature
Adhikari, Prabal; Andersen, Jens Oluf; Kneschke, Patrick (Journal article; Peer reviewed, 2019-10)In this paper, we calculate the equation of state of two-flavor finite isospin chiral perturbation theory at next-to-leading order in the pion-condensed phase at zero temperature. We show that the transition from the vacuum ...