Vidar Skogvoll

• Skogvoll, Vidar & Odden, Tor Ole Bigton (2026). How physics professors use and frame generative AI tools. European Journal of Physics. ISSN 0143-0807. 47(2). doi: 10.1088/1361-6404/ae55e0. Fulltekst i vitenarkiv
• Skogvoll, Vidar & Dobson, Stephen Roderick (2026). Beginning Correctional and Police Officers: Developing a Professional Voice and Sense of Belonging Through ba and anti-ba: In the Still of the Night, We Share Professional Stories. Education Sciences. 16(3). doi: 10.3390/educsci16030436. Fulltekst i vitenarkiv
• Skogvoll, Vidar & Jonas, Rønning (2024). ComFiT: A Python library for computational field theory with topological defects. Journal of Open Source Software (JOSS). 9(98). doi: 10.21105/joss.06599. Fulltekst i vitenarkiv Vis sammendrag

  The core functionality of ComFiT is provided in the BaseSystem class, which defines a computational domain, auxiliary quantities, methods for time evolution, visualization tools and algorithms for identifying and tracking topological defects. To simulate a physical system, a user can create a class inheriting from BaseSystem and implement the specific equations and parameters of the model. The library also provides a range of predefined models, which inherit from the BaseSystem class, such as QuantumMechanics, BoseEinsteinCondensate, NematicLiquidCrystal, and PhaseFieldCrystal, each tailored to a specific field theory, which may be used to quickly get started with simulations for research or educational purposes. The project aims to be highly community-driven, continuously improving the code stability, efficiency and usability, and to be a platform for sharing and developing new models and methods for field theories and topological defects. The documentation is hosted with MkDocs and contains a range of theoretical backgrounds for all the subclasses, tutorials, and examples to guide users through the process of setting up and running simulations, as well as visualizing and analyzing the results.

• Punke, Maik; Skogvoll, Vidar & Salvalaglio, Marco (2023). Evaluation of the elastic field in phase-field crystal simulations. Proceedings in Applied Mathematics and Mechanics : PAMM. 23(3). doi: 10.1002/pamm.202300213. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Rønning, Jonas; Salvalaglio, Marco & Angheluta, Luiza (2023). A unified field theory of topological defects and non-linear local excitations. npj Computational Materials. 9(1), s. 1–13. doi: 10.1038/s41524-023-01077-6. Fulltekst i vitenarkiv Vis sammendrag

  Abstract Topological defects and smooth excitations determine the properties of systems showing collective order. We introduce a generic non-singular field theory that comprehensively describes defects and excitations in systems with O ( n ) broken rotational symmetry. Within this formalism, we explore fast events, such as defect nucleation/annihilation and dynamical phase transitions where the interplay between topological defects and non-linear excitations is particularly important. To highlight its versatility, we apply this formalism in the context of Bose-Einstein condensates, active nematics, and crystal lattices.

• Skogvoll, Vidar; Salvalaglio, Marco & Angheluta, Luiza (2022). Hydrodynamic phase field crystal approach to interfaces, dislocations, and multi-grain networks. Modelling and Simulation in Materials Science and Engineering. ISSN 0965-0393. 30(8). doi: 10.1088/1361-651X/ac9493. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Angheluta, Luiza; Skaugen, Audun; Salvalaglio, Marco & Viñals, Jorge (2022). A phase field crystal theory of the kinematics of dislocation lines. Journal of the Mechanics and Physics of Solids. ISSN 0022-5096. 166, s. 1–19. doi: 10.1016/j.jmps.2022.104932. Fulltekst i vitenarkiv Vis sammendrag

  We introduce a dislocation density tensor and derive its kinematic evolution law from a phase field description of crystal deformations in three dimensions. The phase field crystal (PFC) model is used to define the lattice distortion, including topological singularities, and the associated configurational stresses. We derive an exact expression for the velocity of dislocation line determined by the phase field evolution, and show that dislocation motion in the PFC is driven by a Peach–Koehler force. As is well known from earlier PFC model studies, the configurational stress is not divergence free for a general field configuration. Therefore, we also present a method (PFCMEq) to constrain the diffusive dynamics to mechanical equilibrium by adding an independent and integrable distortion so that the total resulting stress is divergence free. In the PFCMEq model, the far-field stress agrees very well with the predictions from continuum elasticity, while the near-field stress around the dislocation core is regularized by the smooth nature of the phase-field. We apply this framework to study the rate of shrinkage of an dislocation loop seeded in its glide plane.

• Skogvoll, Vidar; Skaugen, Audun; Angheluta, Luiza & Viñals, Jorge (2021). Dislocation nucleation in the phase-field crystal model. Physical review B (PRB). ISSN 2469-9950. 103(1), s. 014107-1–014107-8. doi: 10.1103/PhysRevB.103.014107. Fulltekst i vitenarkiv Vis sammendrag

  We use the phase-field crystal model to study nucleation of edge dislocations in two dimensions under an applied stress field. A dislocation dipole nucleates under the applied stress, consistent with Burgers vector conservation. The phase field correctly accounts for elastic energy storage prior to nucleation and for dissipative relaxation during the nucleation event. We show that a lattice incompatibility field is a sensitive diagnostic of the location of the nucleation event and of the Burgers vector and slip direction of the dislocations that will be nucleated above threshold. A direct calculation of the phase-field energy accurately correlates with the nucleation event, as signaled by the lattice incompatibility field. We show that a Schmid-like criterion concerning the resolved stress at the nucleation site correctly predicts the critical nucleation stress. Finally, we present preliminary results for a three-dimensional, bcc lattice. The phase field allows direct computation of the lattice incompatibility tensor for both dislocation lines and loops.

• Skogvoll, Vidar; Skaugen, Audun & Angheluta, Luiza (2021). Stress in ordered systems: Ginzburg-Landau-type density field theory. Physical review B (PRB). ISSN 2469-9950. 103(22). doi: 10.1103/PhysRevB.103.224107. Fulltekst i vitenarkiv Vis sammendrag

  We present a theoretical method for deriving the stress tensor and elastic response of ordered systems within a Ginzburg-Landau-type density field theory in the linear regime. This is based on spatially coarse graining the microscopic stress which is determined by the variation of a free energy with respect to mass displacements. We find simple expressions for the stress tensor for phase field crystal models for different crystal symmetries in two and three dimensions. Using tetradic product sums of reciprocal lattice vectors, we calculate elastic constants and show that they are directly related to the symmetries of the reciprocal lattices. We also show that except for bcc lattices there are regions of model parameters for which the elastic response is isotropic. The predicted elastic stress-strain curves are verified by numerical strain-controlled bulk and shear deformations. Since the method is independent of a reference state, it extends also to defected crystals. We exemplify this by considering an edge and screw dislocation in the simple cubic lattice.

• Skogvoll, Vidar & Liabøtrø, Ola (2017). Composite fermion basis for M-component Bose gases. Journal of Physics A: Mathematical and Theoretical. ISSN 1751-8113. 50(40). doi: 10.1088/1751-8121/aa85f7. Fulltekst i vitenarkiv

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• Skogvoll, Vidar & Haraldsrud, Andreas (2026). Lære med KI. Universitetsforlaget. ISBN 9788215076928. 208 s. Fulltekst i vitenarkiv

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• Garvang, Even Sletteng; Skogvoll, Vidar & Andersen, Gard Lilledal (2026). Under Kappa #86 - The Thing vs. Mystique, med Gard Lilledal Andersen - Steinhard hud og skuespill. doi: https:/www.underkappa.no/2188463/episodes/19742123-86-the-thing-vs-mystique-med-gard-lilledal-andersen-steinhard-hud-og-skuespill. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Garvang, Even Sletteng; Wahl, Andreas Solberg; Dahlen, Pia Ve; Andersen, Gard Lilledal & Røyne, Anja (2025). Under Kappa #55 - Fantastiske 4: Mysteriet i Oslo. doi: https:/www.youtube.com/watch?app=desktop&v=phUVkoJXPJM. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Sand, Odd Petter & Haraldsrud, Andreas (2024). S3E2: KURT fikser formene - Forelesningen. [Internet]. https://open.spotify.com/episode/6VhcqrLwz8OIYmFrzJRO1P. Fulltekst i vitenarkiv
• Elwart, Veronika Paula & Skogvoll, Vidar (2024). tv2.no - Her går det galt. [TV]. tv2.no. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Garvang, Even Sletteng & Reinertsen, Marianne (2024). Under kappa - #21 - Wonder woman - Lassojuss, løgndetektorer og pistolreker med marianne reinsertsen. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2024). Hva er lov, fusk og lurt ved bruk av kunstig intelligens? Fulltekst i vitenarkiv
• Skogvoll, Vidar (2024). Muntlig tilbakemelding. Fulltekst i vitenarkiv
• Skogvoll, Vidar & Odden, Tor Ole Bigton (2024). Lære fysikk med språkmodeller. Fra Fysikkens Verden. ISSN 0015-9247. 2, s. 74–80. Fulltekst i vitenarkiv
• Andersen, Ida Yasin; Bendiksen, Kristian; Slangsvold, Einar Lie; Skogvoll, Vidar & Garvang, Even Sletteng (2024). Studio 2 - Påskeharen som superhelt. [Radio]. P2. Fulltekst i vitenarkiv
• Elwart, Veronika Paula & Skogvoll, Vidar (2024). tv2.no - Unngå feilen "alle" gjør. [TV]. tv2.no. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Winther-Larsen, Hanne Cecilie & Robertsen, Ida (2024). Real læring - Realistfabrikken: Hvordan lage farmasøyt. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Lilleøren, Karianne Staalesen & Anell, Ingrid (2024). Real læring - Realistfabrikken: Hvordan lage geoviter. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Lindstrøm, Tom Louis; Benth, Fred Espen & Haraldsrud, Andreas (2024). Real læring - Realistfabrikken: Hvordan lage matematiker. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Hessen, Dag Olav & Gregers, Tone Fredsvik (2024). Real læring - Realistfabrikken: Hvordan lage biolog. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Uggerud, Nora & Fægri, Karoline (2024). Real læring - Realistfabrikken: Hvordan lage kjemiker. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2024). Muligheter og fallgruver ved kunstig intelligens i undervisnnigen. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Garvang, Even Sletteng; Brugård, Anne & Ottem, John Christian (2024). Under Kappa - #29 - The Riddler - Gode nøtter, smarte dyr og spillteori med Anne Brugård og John Christian Ottem. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2024). Under Kappa - How to make a podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar & Garvang, Even Sletteng (2024). Under Kappa - #28 - Professor X - Live! Mutantgener og fysikken bak hjernekontroll. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Garvang, Even Sletteng & Hval, Halvor Høen (2024). Under kappa - #25 - Green lantern - Batterier, farger, følelser og plancks konstant med halvor høen hval. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Larsen, Ann-Cecilie & Kvellestad, Anders (2024). Real læring - Realistfabrikken: Hvordan lage fysiker. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Sandve, Geir Kjetil Ferkingstad; Kempton, Alexander Moltubakk & Gregers, Tone Fredsvik (2024). Real læring - Realistfabrikken: Hvordan lage informatiker. [Radio]. Podcast. Fulltekst i vitenarkiv
• Brugård, Anne; Ottem, John Christian & Skogvoll, Vidar (2024). Abelegøyer - #42 - Påskespesial ft. Under Kappa. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2024). Superheltfysikk - hvordan bruke podcasten min i undervisningen din. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2024). How to research with AI (LLMS). Fulltekst i vitenarkiv
• Skogvoll, Vidar (2024). Superheltfysikk. Fulltekst i vitenarkiv
• Jemterud, Torkild; Skogvoll, Vidar & Garvang, Even Sletteng (2024). Abels tårn - Hva slags superkrefter har påskeharen? [Radio]. P2. Fulltekst i vitenarkiv
• Storehaug, Ida Torkjellsdatter & Skogvoll, Vidar (2024). Hva er entropi? Fulltekst i vitenarkiv
• Garvang, Even Sletteng & Skogvoll, Vidar (2023). Under Kappa - #5 - The Flash - Raske dyr og tidrommet. [Radio]. Podcast. Fulltekst i vitenarkiv
• Garvang, Even Sletteng & Skogvoll, Vidar (2023). Under Kappa - #6 - Catwoman - Katter, og hvorfor de alltid lander på beina. [Radio]. Podcast. Fulltekst i vitenarkiv
• Garvang, Even Sletteng & Skogvoll, Vidar (2023). Under Kappa - #4 - Supermann - Astrofysikk og romvesenbiologi. [Radio]. Podcast. Fulltekst i vitenarkiv
• Delsett, Lene Liebe; Skogvoll, Vidar; Kline, Simon Hasselø & Jemterud, Torkild (2023). Abels tårn - Er det flest øyne eller føtter i verden? [Radio]. NRK P2. Fulltekst i vitenarkiv
• Andersen, Ida Yasin; Bendiksen, Kristian; Slangsvold, Einar Lie; Skogvoll, Vidar & Garvang, Even Sletteng (2023). Studio 2 - Julenissen som superhelt. [Radio]. P2. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Garvang, Even Sletteng & Bremnes, Inge (2023). Under kappa - #19 - Black bolt - Stemmeteknikk, lyd og bråkete dyr med Inge bremnes. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Westbye, Hilde & Taugbøl, Nils Canut (2023). Real læring - ChatGPT: Hva er juks? [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Jensen, Siri Moe; Max, Richard & Gregers, Tone Fredsvik (2023). Real læring - ChatGPT: Roboten avskaffer obliger! [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Garvang, Even Sletteng & Andersen, Guro Lilledal (2023). Under Kappa - #15 - The Thing - Stein, dyr med skall og superharde materialer med Guro Lilledal Andersen. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Odden, Tor Ole Bigton & Myhrehagen, Henning Vinjusveen (2023). Real læring - ChatGPT: The teacher of tomorrow is a robot! [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Garvang, Even Sletteng & Winnberg, Kirsti (2023). Under Kappa - #13 - Hell Cow - Kyr, blodsugende dyr og effektive fly med Kirsti Winnberg. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Garmann-Aarhus, Benedicte; Røyne, Anja & Bråthen, Ole Markus (2023). Real læring - ChatGPT: Fagformidling med robothjelp. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Garvang, Even Sletteng & Uggerud, Nora (2023). Under kappa - #11 - Scorpion - Syre, vannkanoner og skorpioner med Nora Uggerud. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Malthe-Sørenssen, Anders & Gregers, Tone Fredsvik (2023). Real læring - ChatGPT: Roboten som vil endre læring og undervisning. [Radio]. Podcast. Fulltekst i vitenarkiv
• Skogvoll, Vidar; Aasen, Anna Hjertvik; Huang, Sylvia Jing Yi & Haraldsrud, Andreas (2023). Real læring - ChatGPT: Slik bruker de beste studentene roboten. [Radio]. Podcast. Fulltekst i vitenarkiv
• Andersen, Ida Yasin; Bendiksen, Kristian; Slangsvold, Einar Lie; Skogvoll, Vidar & Garvang, Even Sletteng (2023). Studio 2 - Fysikk og biologi i superheltfilmen The Flash. [Radio]. P2. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2023). LA-programmet. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2023). Topological defects across systems. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2023). Brownian motion. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2023). Symmetry, topology and crystal deformations: A phase-field crystal approach. Fulltekst i vitenarkiv
• Jemterud, Torkild; Skogvoll, Vidar; Røyne, Anja; Eriksen, Anita; Gravensteen, Ida Kathrine & Ellingsen-Dalskau, Kristian (2023). Abels tårn - Abels Påskemix - Hvorfor liker vi surt godteri, sånn rent evolusjonært? [Radio]. P2. Fulltekst i vitenarkiv
• Jemterud, Torkild; Skogvoll, Vidar; Iqbal, Yasmin Sofia & Sandtorv, Alexander H. (2023). Abels tårn - Abels førjulstårn. [Radio]. P2. Fulltekst i vitenarkiv
• Jemterud, Torkild; Skogvoll, Vidar; Svalheim, Trygve Leithe & Vestre, Katharina (2023). Abels tårn - Er tid en illusjon? [Radio]. P2. Fulltekst i vitenarkiv
• Skogvoll, Vidar & Garvang, Even Sletteng (2023). REAL kino: Thor! Fulltekst i vitenarkiv
• Skogvoll, Vidar (2023). Symmetry, topology and crystal deformations: a phase-field crystal approach. Fulltekst i vitenarkiv
• Jemterud, Torkild; Skogvoll, Vidar; Eriksen, Anita & Røyne, Anja (2023). Abels tårn - Abels påsketårn - Myrlik og mørkets dragning. [Radio]. P2. Fulltekst i vitenarkiv
• Jemterud, Torkild; Skogvoll, Vidar; Svalheim, Trygve Leithe & Vestre, Katharina (2023). Abels kjeller - Kosmisk krympflasjon, tid og Big Bang. [Radio]. P2. Fulltekst i vitenarkiv
• Storehaug, Ida Torkjellsdatter & Skogvoll, Vidar (2023). God Fysikk: Av entropi er du kommet til mer entropi skal du bli, med Vidar Skogvoll. Fulltekst i vitenarkiv Vis sammendrag

  Entropi er kilden til liv, og universets endelige død. Det får bokstavelig talt tida til å gå. Men hva er det? I denne episoden går Ida Storehaug og Vidar Skogvoll ved Fysisk Institutt gjennom tre definisjoner av entropi. Vi følger vitenskapshistorien fra dampmaskiner til kvantedatamaskiner, og ender i noen filosofiske betraktninger om tidas natur. Her følger en episode med høy entropi!

• Skogvoll, Vidar; Jemterud, Torkild; Bøckman, Petter & Røyne, Anja (2022). Abels tårn - Det iler i skrittet når jeg ser smerte! Fulltekst i vitenarkiv
• Wahl, Andreas; Skogvoll, Vidar & Barua, Ishita (2022). Jøss‽ - #54 - Fridtjof i dødt vann, frosne sitrontrær og narkolegen. [Radio]. Podcast. Fulltekst i vitenarkiv
• Wahl, Andreas Solberg; Skogvoll, Vidar & Barua, Ishita (2022). Jøss‽ - #59 - Ett nevron mindre, drittdag på jobb og effekten av hjemmeskole. [Radio]. Podcast. Fulltekst i vitenarkiv
• Paus-Knudsen, Julie Sørlie; Skogvoll, Vidar & Nilsen, Wendy (2022). Ph.D.-podden - Balansekunst. [Radio]. Podcast. Fulltekst i vitenarkiv
• Joner, Erik; Vestre, Katharina; Skogvoll, Vidar & Jemterud, Torkild (2022). Abels tårn. [Radio]. Radio P2. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2022). A phase field crystal theory of the kinematics of dislocation lines. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2022). Phase field modelling of dislocation dynamics with elastic interactions. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2022). A phase-field crystal framework for 3D dislocation dynamics. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2022). A phase field crystal theory of the kinematics of dislocation lines. Fulltekst i vitenarkiv
• Jemterud, Torkild; Sverdrup-Thygeson, Anne; Uggerud, Einar; Einevoll, Gaute; Joner, Erik & Skogvoll, Vidar [Vis alle 7 forfattere av denne artikkelen] (2022). Abels tårn - Suicidale fluer og en ode til urin. Fulltekst i vitenarkiv
• Jemterud, Torkild; Bøhn, Einar Duenger; Løseth, Guro & Skogvoll, Vidar (2022). Abels tårn på Øya - Hvordan piffe opp daff festivaløl? [Radio]. P2. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2021). 8 måter å brekke ting på. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2021). Modelling microstructures and dislocation dynamics with phase fields. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2021). Phase field crystal modelling of dislocation dynamics. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2020). A minimal model for crystal plasticity. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2020). 8 måter å brekke ting på. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2019). The Phase-field Crystal. Fulltekst i vitenarkiv
• Skogvoll, Vidar (2017). Three M-Species Generalizations for Rotating Bose Gases in the Lowest Landau Level. Universitetet i Oslo. Fulltekst i vitenarkiv Vis sammendrag

  We generalize three known theoretical results from 1- and 2-species systems to an M-component rotating Bose gas in the lowest Landau level (LLL). First, we find a subspace of the Hilbert space which is closed under homogeneous interaction and diagonalize analytically within this subspace to find the eigenenergies. This is a straight-forward generalization of Ref. [1] from 2 to M species. Second, we state and prove the validity of a basis for a particular class of composite fermion (CF) trial wave functions, known as "simple states" [2], for M-component Bose gases. By doing so, we generalize the simple state basis for 2-component Bose gases found in Ref. [3]. The number of basis elements in the M -component basis is linked to a certain class of combinatorial polynomials called q-multinomials. The proof of the M-component basis has been condensed into an article [4] and is currently under consideration by Journal of Physics A. Third, we have developed numerical tools to study the properties of the CF formalism applied to M -species Bose gases in the LLL and show that the formalism is excellent in capturing the low-energy behavior of such systems for M > 2. This is a generalization of previous results [5, 6, 2], which has shown that the CF formalism is excellent when applied to 1- and 2-component Bose gases. As part of this third generalization, we show how the formalism of simple states captures a class of eigenfunctions of the homogeneous contact interaction. This can be used to effectively visualize the evolution of the ground state of N spin-1 bosons under spin-independent interaction as a function of angular momentum L (originally found in Ref. [7]) for L ≤ N .

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