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Alexander Karl Rothkopf

Associate Professor in Physics

KE-E 537
Det teknisk- naturvitenskapelige fakultet
Institutt for matematikk og fysikk
KE E-537
Bio

Research Profile:

I work on elucidating the real-time properties of strongly coupled quantum systems, such as e.g. the quark-gluon plasma created in relativistic heavy-ion collisions. To this end I study the spectral properties of bound states and single particles in QCD and scalar theories. The non-perturbative nature of the problems at hand leads me to use predominantly numerical methods, such as lattice QCD. A particular interest lies in the extraction of spectral functions from Euclidean correlator data using Bayesian inference.

Selected ongoing research projects:

1) Determination of the heavy quark potential from realistic lattice QCD simulations with novel machine-learning assisted spectral extraction methods ( with Gaurang Parkar (UiS), Rasmus N. Larsen (UiS), Peter Petreczky (BNL), Swagato Mukherjee (BNL))

2) Elucidating the real-time dynamics of heavy quarkonium states based on the Open-Quantum-Systems framework ( with Y. Akamatsu (U. Osaka) )

3) Development of improved discretization schemes for the accurate simulation of Open-Quantum-Systems dynamics ( with J. Nordström (U. Linköping) )

4) Development of novel machine-learning assisted real-time simulation strategies for strongly correlated quantum fields ( with D. Alvestad (UiS) )

Teaching:

1) Introduction to Quantum Mechanics

This course provides the students with a first introduction to the field of quantum mechanics. It both allows students to get familiar with the novel concepts of quantum mechanics and to train the computational skills needed to solve simple problems.

2) Quantum particles and fields on the lattice 

This course provides a theoretical and practical introduction to the description of quantum particles and fields in a discretized setting, relevant for e.g. numerical simulations of the strong interactions (lattice QCD). Besides regular lectures the course features an hands-on tutorial in which students themselves implement simulation strategies.

 

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Publications
  • Vitenskapelige publikasjoner
    • Alvestad, Daniel; Larsen, Rasmus Normann; Rothkopf, Alexander Karl

      (2021)

      Stable solvers for real-time Complex Langevin.

      Journal of High Energy Physics (JHEP)

      ISSN 1126-6708.

      Volum 08.

      DOI: 10.1007/JHEP08(2021)138

    • Lehmann, Alexander; Rothkopf, Alexander Karl

      (2021)

      Proper static potential in classical lattice gauge theory at finite T.

      Journal of High Energy Physics (JHEP)

      ISSN 1126-6708.

      DOI: 10.1007/JHEP07(2021)067

    • Lafferty, David; Rothkopf, Alexander Karl

      (2020)

      Improved Gauss law model and in-medium heavy quarkonium at finite density and velocity.

      Physical Review D

      ISSN 2470-0010.

      Volum 101.

      DOI: 10.1103/PhysRevD.101.056010

    • Oskar, Ålund; Akamatsu, Yukinao; Fredrik, Laurén; Miura, Takahiro; Nordström, Jan; Rothkopf, Alexander Karl

      (2020)

      Trace preserving quantum dynamics using a novel reparametrization-neutral summation-by-parts difference operator.

      Journal of Computational Physics

      ISSN 0021-9991.

      DOI: 10.1016/j.jcp.2020.109917

    • Liang, Jian; Draper, Terrence; Liu, Keh-Fei; Rothkopf, Alexander Karl; Yang, Yi-Bo

      (2020)

      Towards the nucleon hadronic tensor from lattice QCD.

      Physical Review D

      ISSN 2470-0010.

      Volum 101.

      DOI: 10.1103/PhysRevD.101.114503

    • Kades, Lukas; Pawlowski, Jan M.; Rothkopf, Alexander Karl; Scherzer, Manuel; Urban, Julian M.; Wetzel, Sebastian J.; Wink, Nicolas; Ziegler, Felix P.G.

      (2020)

      Spectral reconstruction with deep neural networks.

      Physical Review D

      ISSN 2470-0010.

      Volum 102.

      DOI: 10.1103/PhysRevD.102.096001

    • Rothkopf, Alexander Karl

      (2020)

      Heavy quarkonium in extreme conditions.

      Physics reports

      ISSN 0370-1573.

      Volum 858.

      s.1-117.

      DOI: 10.1016/j.physrep.2020.02.006

    • Miura, Takahiro; Akamatsu, Yukinao; Asakawa, Masayuki; Rothkopf, Alexander Karl

      (2020)

      Quantum Brownian motion of a heavy quark pair in the quark-gluon plasma.

      Physical Review D

      ISSN 2470-0010.

      Volum 101.

      Hefte 3.

      DOI: 10.1103/PhysRevD.101.034011

    • Rothkopf, Alexander Karl

      (2020)

      Bryan’s Maximum Entropy Method—Diagnosis of a Flawed Argument and Its Remedy.

      Data

      ISSN 2306-5729.

      Volum 5.

      Hefte 3.

      DOI: 10.3390/data5030085

    • Shen, Linda; Berges, Jürgen; Pawlowski, Jan M.; Rothkopf, Alexander Karl

      (2020)

      Thermalization and dynamical spectral properties in the quark-meson model.

      Physical Review D

      ISSN 2470-0010.

      Volum 102.

      Hefte 1.

      DOI: 10.1103/PhysRevD.102.016012

    • Rothkopf, Alexander Karl

      (2019)

      Quarkonium production in the QGP.

      Universe

      ISSN 2218-1997.

      Volum 5.

      Hefte 5.

      DOI: 10.3390/universe5050117

    • Karpie, Joseph; Orginos, Kostas; Rothkopf, Alexander Karl; Zafeiropoulos, Savvas

      (2019)

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

      Journal of High Energy Physics (JHEP)

      ISSN 1126-6708.

      Volum 04.

      DOI: 10.1007/JHEP04(2019)057

    • Kajimoto, Shiori; Akamatsu, Yukinao; Asakawa, Masayuki; Rothkopf, Alexander Karl

      (2019)

      Quantum dynamical dissociation of quarkonia by wave function decoherence in quark-gluon plasma.

      Nuclear Physics A

      ISSN 0375-9474.

      Volum 982.

      s.711-714.

      DOI: 10.1016/j.nuclphysa.2018.12.005

    • Petreczky, Peter; Rothkopf, Alexander Karl; Weber, Johannes Heinrich

      (2019)

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

      Nuclear Physics A

      ISSN 0375-9474.

      Volum 982.

      s.735-738.

      DOI: 10.1016/j.nuclphysa.2018.10.012

    • Krouppa, Brandon; Rothkopf, Alexander Karl; Strickland, Michael

      (2019)

      Bottomonium suppression at RHIC and LHC.

      Nuclear Physics A

      ISSN 0375-9474.

      Volum 982.

      s.727-730.

      DOI: 10.1016/j.nuclphysa.2018.09.034

    • Astrakhantsev, Nikita Yu.; Bornyakov, Vitaly G.; Braguta, Victor V.; Ilgenfritz, Ernst-Michael; Kotov, Andrey Yuryevich; Nikolaev, Alexander A.; Rothkopf, Alexander Karl

      (2019)

      Lattice study of static quark-antiquark interactions in dense quark matter.

      Journal of High Energy Physics (JHEP)

      ISSN 1126-6708.

      Volum 2019.

      Hefte 5.

      DOI: 10.1007/JHEP05(2019)171

    • Lafferty, David; Rothkopf, Alexander Karl

      (2019)

      Quarkonium phenomenology from a generalised Gauss law.

      Universe

      ISSN 2218-1997.

      Volum 5.

      Hefte 5.

      DOI: 10.3390/universe5050119

    • Kim, Seyong; Petreczky, Peter; Rothkopf, Alexander Karl

      (2018)

      Quarkonium in-medium properties from realistic lattice NRQCD.

      Journal of High Energy Physics (JHEP)

      ISSN 1126-6708.

      Volum 2018.

      Hefte 11.

      DOI: 10.1007/JHEP11(2018)088

    • Astrakhantsev, Nikita Yu.; Bornyakov, Vitaly G.; Braguta, Victor V.; Ilgenfritz, Ernst-Michael; Kotov, Andrey Yuryevich; Nikolaev, Alexander A.; Rothkopf, Alexander Karl

      (2018)

      Study of deconfined quark matter at zero temperature and high density.

      Proceedings of Science (PoS)

      ISSN 1824-8039.

      Volum 336:154.

      s.1-27.

      DOI: 10.22323/1.336.0154

    • Akamatsu, Yukinao; Asakawa, Masayuki; Kajimoto, Shiori; Rothkopf, Alexander Karl

      (2018)

      Quantum dissipation of a heavy quark from a nonlinear stochastic Schrödinger equation.

      Journal of High Energy Physics (JHEP)

      ISSN 1126-6708.

      Volum 2018.

      Hefte 7.

      DOI: 10.1007/JHEP07(2018)029

  • Bøker og kapitler
  • Formidling
    • Rothkopf, Alexander Karl

      (2021)

      Strongly interacting systems at finite T: results from the lattice.

    • Rothkopf, Alexander Karl

      (2021)

      Habemus ReV - Proper heavy quark potential in classical lattice gauge theory.

    • Rothkopf, Alexander Karl

      (2021)

      Conserving Lattice Gauge Theory for Finite Systems.

    • Rothkopf, Alexander Karl

      (2021)

      Towards dissipative in-medium QQ dynamics from the complex interquark potential.

    • Rothkopf, Alexander Karl

      (2021)

      Stable solvers for real-time Complex Langevin.

    • Rothkopf, Alexander Karl

      (2021)

      Conserving Lattice Gauge Theory for Finite Systems.

    • Rothkopf, Alexander Karl

      (2021)

      Dying Particles in the Little Bang.

    • Rothkopf, Alexander Karl

      (2021)

      The Science of Fission Energy.

    • Rothkopf, Alexander Karl

      (2021)

      Open Quantum Systems - Quarkonia.

    • Rothkopf, Alexander Karl

      (2021)

      Open-Quantum-Systems: Precision Thermometry at the Extremes.

    • Broekel, Tom; Sareen, Siddharth; Solheim, Marte Cecilie Wilhelmsen; By, Rune Todnem; Rothkopf, Alexander Karl

      (2021)

      Dog Eat Dog.

    • Rothkopf, Alexander Karl

      (2020)

      Open-Quantum-Systems: Precision Thermometry at the Extremes.

    • Rothkopf, Alexander Karl

      (2020)

      Open-Quantum-Systems: Precision Thermometry at the Extremes.

    • van der Giezen, Mark; Rothkopf, Alexander Karl; Eggebø, Olav; Berland, Unni

      (2020)

      Nobelprisene – ​ en foredragsserie fra UiS​.

    • Rothkopf, Alexander Karl

      (2019)

      Towards in medium Quarkonium dynamics from first principles.

    • Rothkopf, Alexander Karl

      (2019)

      Quarkonium real-time dynamics in heavy-ion collisions .

    • Rothkopf, Alexander Karl

      (2019)

      From Japan to Norway and onwards to the Big Bang.

    • Rothkopf, Alexander Karl

      (2019)

      Quarkonium theory.

    • Rothkopf, Alexander Karl

      (2019)

      Towards in medium quarkonium from first principles.

    • Rothkopf, Alexander Karl

      (2019)

      Tackling inverse problems on the lattice: from quarkonium spectral functions to PDFs.

    • Rothkopf, Alexander Karl

      (2018)

      In-medium heavy quarkonium from lattice NRQCD.

    • Rothkopf, Alexander Karl

      (2018)

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

    • Rothkopf, Alexander Karl

      (2018)

      Real-time dynamics from lattice QCD: prospects and challenges.

    • Rothkopf, Alexander Karl

      (2018)

      Quarkonium production in the QGP .

    • Rothkopf, Alexander Karl

      (2018)

      Quarkonium at high temperatures from the lattice.

    • Rothkopf, Alexander Karl

      (2018)

      Quarkonium.

    • Rothkopf, Alexander Karl

      (2018)

      Bayesian techniques and applications to QCD.

    • Rothkopf, Alexander Karl

      (2018)

      Quarkonium realtime dynamics.

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