• Cold quark matter at N3LO: Soft contributions 

      Gorda, Tyler; Kurkela, Eero Aleksi; Paatelainen, Risto; Säppi, Saga; Vuorinen, Aleksi (Peer reviewed; Journal article, 2021)
      High-order perturbative calculations for thermodynamic quantities in QCD are complicated by the physics of dynamical screening that affects the soft, long-wavelength modes of the system. Here, we provide details for the ...
    • Dimensional reduction of the Standard Model coupled to a new singlet scalar field 

      Brauner, Tomas; Tenkanen, Tuomas; Tranberg, Anders; Vuorinen, Aleksi; Weir, David James (Journal article; Peer reviewed, 2017)
      We derive an effective dimensionally reduced theory for the Standard Model augmented by a real singlet scalar. We treat the singlet as a superheavy field and integrate it out, leaving an effective theory involving only the ...
    • Evidence for quark-matter cores in massive neutron stars 

      Annala, Eemeli; Gorda, Tyler; Kurkela, Aleksi; Nättilä, Joonas; Vuorinen, Aleksi (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. ...
    • Multimessenger Constraints for Ultradense Matter 

      Annala, Eemeli; Gorda, Tyler; Katerini, Evangelia; Kurkela, Eero Aleksi; Nättilä, Joonas; Paschalidis, Vasileios; Vuorinen, Aleksi (Peer reviewed; Journal article, 2022)
      Recent rapid progress in neutron-star (NS) observations offers great potential to constrain the properties of strongly interacting matter under the most extreme conditions. In order to fully exploit the current observational ...
    • 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 high-order perturbative calculations at finite density 

      Ghisoiu, Ioan; Gorda, Tyler; Kurkela, Aleksi; Romatschke, Paul; Säppi, Matias; Vuorinen, Aleksi (Journal article; Peer reviewed, 2017-02)
      We discuss the prospects of performing high-order perturbative calculations in systems characterized by a vanishing temperature but finite density. In particular, we show that the determination of generic Feynman integrals ...
    • 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 ...
    • Soft Interactions in Cold Quark Matter 

      Gorda, Tyler; Kurkela, Eero Aleksi; Paatelainen, Risto; Säppi, Saga; Vuorinen, Aleksi (Peer reviewed; Journal article, 2021-10)
      Accurate knowledge of the thermodynamic properties of zero-temperature, high-density quark matter plays an integral role in attempts to constrain the behavior of the dense QCD matter found inside neutron-star cores, ...
    • Soft photon propagation in a hot and dense medium to next-to-leading order 

      Gorda, Tyler; Kurkela, Eero Aleksi; Österman, Juuso; Paatelainen, Risto; Säppi, Saga; Schicho, Philipp; Seppänen, Kaapo; Vuorinen, Aleksi (Peer reviewed; Journal article, 2023)
      We present the first complete calculation of the soft photon self-energy to the next-to-leading order in a hot and/or dense ultrarelativistic plasma in QED. The calculation is performed within the real-time formalism ...