Per Kristian Rekdal

• Skagerstam, Bo-Sture; Eriksson, Karl-Erik & Rekdal, Per Kristian (2019). Causality in quantum field theory with classical sources. Journal of Physics Communications.  ISSN 2399-6528.  3(8) . doi: 10.1088/2399-6528/ab3c1c Full text in Research Archive. Show summary

  In an exact quantum-mechanical framework we show that space-time expectation values of the second-quantized electromagnetic fields in the Coulomb gauge in the presence of a classical conserved source automatically lead to causal and properly retarded -independent electromagnetic field strengths. The classical -independent and gauge invariant Maxwell's equations naturally emerge in terms of quantum-mechanical expectation values and are therefore also consistent with the classical special theory of relativity. The fundamental difference between interference phenomena due to the linear nature of the classical Maxwell theory as considered in, e.g., classical optics, and interference effects of quantum states is clarified. In addition to these issues, the framework outlined also provides for a simple approach to invariance under time-reversal, some spontaneous photon emission and/or absorption processes as well as an approach to Vavilov-Čherenkov radiation. The inherent and necessary quantum uncertainty, limiting a precise space-time knowledge of expectation values of the quantum fields considered, is, finally, recalled.

• Molka-Danielsen, Judith & Rekdal, Per Kristian (2018). Concept and prototype design of massive open online network for innovation and knowledge sharing, In Heidi Hogset; Dag Magne Berge & Karl Yngvar Dale (ed.),  Det regionale i det internasjonale : fjordantologien 2018.  Universitetsforlaget.  ISBN 9788215031217.  Kapittel 5.  s 82 - 100 Show summary

  Small businesses in high-tech industries can be at a disadvantage when it comes to accessing research to compete within their own industries. Using a Design Science Research approach, we develop the concept of a Massive Open Online Network and implement a prototype that aims to support knowledge sharing among formal and informal persons, groups and organisations. We contribute novel knowledge in design principles and prototype that can be applied to support co-creation and innovation.

• Skagerstam, Bo-Sture; Eriksson, Karl-Erik & Rekdal, Per Kristian (2018). Quantum field theory with classical sources : linearized quantum gravity. Classical and quantum gravity.  ISSN 0264-9381.  36(1), s 1- 19 . doi: 10.1088/1361-6382/aaf113 Show summary

  In a previous work (Skagerstam 2018 arXiv:1801.09947v1 [quant-ph]) and in terms of an exact quantum-mechanical framework, causal and retarded expectation values of the second-quantized electro-magnetic fields in the Coulomb gauge were derived in the presence of a conserved classical electric current. The classical Maxwell’s equations then naturally emerged. In the present work, we extend these considerations to linear gravitational quantum deviations around a flat Minkowski space-time in a Coulomb-like gauge. The emergence of the classical, causal, and properly retarded linearized classical theory of general relativity with a conserved classical energy–momentum tensor is then outlined. The quantum-mechanical framework also provides for a simple approach to classical quadrupole gravitational radiation of Einstein and microscopic spontaneous graviton emission and/or absorption processes.

• Grimsmo, Arne Løhre; Vaskinn, Asle Heide; Rekdal, Per Kristian & Skagerstam, Bo-Sture (2013). Memory effects in spontaneous emission processes. Physical Review A. Atomic, Molecular, and Optical Physics (PRA).  ISSN 1050-2947.  87(2), s 1- 12 . doi: 10.1103/PhysRevA.87.022101 Show summary

  We consider a quantum-mechanical analysis of spontaneous emission in terms of an effective two-level system with a vacuum decay rate Γ0 and transition angular frequency ωA. Our analysis is in principle exact, even though presented as a numerical solution of the time evolution including memory effects. The results so obtained are confronted with previous discussions in the literature. In terms of the dimensionless lifetime τ=tΓ0 of spontaneous emission, we obtain deviations from exponential decay of the form O(1/τ) for the decay amplitude as well as the previously obtained asymptotic behaviors of the form O(1/τ2) or O(1/τln2τ) for τ≫1. The actual asymptotic behavior depends on the adopted regularization procedure as well as on the physical parameters at hand. We show that for any reasonable range of τ and for a sufficiently large value of the required angular frequency cutoff ωc of the electromagnetic fluctuations, i.e., ωc≫ωA, one obtains either a O(1/τ) or a O(1/τ2) dependence. In the presence of physical boundaries, which can change the decay rate with many orders of magnitude, the conclusions remains the same after a suitable rescaling of parameters.

• Skagerstam, Bo-Sture; Rekdal, Per Kristian & Vaskinn, Asle Heide (2009). Theory of Casimir-Polder forces. Physical Review A. Atomic, Molecular, and Optical Physics (PRA).  ISSN 1050-2947.  80(2) . doi: 10.1103/PhysRevA.80.022902
• Hohenester, Ulrich; Rekdal, Per Kristian; Borzì, Alfio & Schmiedmayer, Jörg (2007). Optimal quantum control of Bose-Einstein condensates in magnetic microtraps. Physical Review A. Atomic, Molecular, and Optical Physics (PRA).  ISSN 1050-2947.  75(2) . doi: 10.1103/PhysRevA.75.023602 Show summary

  Transport of Bose-Einstein condensates in magnetic microtraps, controllable by external parameters such as wire currents or radio-frequency fields, is studied within the framework of optimal control theory (OCT). We derive from the Gross-Pitaevskii equation the optimality system for the OCT fields that allow efficient channeling of the condensate between given initial and desired states. For a variety of magnetic confinement potentials we study transport and wave-function splitting of the condensate, and demonstrate that OCT drastically outperforms simpler schemes for the time variation of the microtrap control parameters.

• Rekdal, Per Kristian & Skagerstam, Bo-Sture (2007). Decay processes in the presence of thin superconducting films. Physical Review A. Atomic, Molecular, and Optical Physics (PRA).  ISSN 1050-2947.  75(2) . doi: 10.1103/PhysRevA.75.022904 Show summary

  In a recent paper [Phys. Rev. Lett. 97, 070401 (2006)] the transition rate of magnetic spin-flip of a neutral two-level atom trapped in the vicinity of a thick superconducting body was studied. In the present paper we will extend these considerations to a situation with an atom at various distances from a dielectric film. Rates for the corresponding electric dipole-flip transition will also be considered. The rates for these atomic flip transitions can be reduced or enhanced, and in some situations they can even be completely suppressed. For a superconducting film or a thin film of a perfect conducting material various analytical expressions are derived that reveals the dependence of the physical parameters at hand.

• Skagerstam, Bo-Sture & Rekdal, Per Kristian (2007). Photon emission near superconducting bodies. Physical Review A. Atomic, Molecular, and Optical Physics (PRA).  ISSN 1050-2947.  76(5) . doi: 10.1103/PhysRevA.76.052901 Show summary

  We study the photon emission due to a magnetic spin-flip transition of a two-level atom in the vicinity of a dielectric body such as a normal conducting metal or a superconductor. For temperatures below the transition temperature Tc of a superconductor, the corresponding spin-flip lifetime is boosted by several orders of magnitude as compared to the case of a normal conducting body. Numerical results of an exact formulation are also compared to a previously derived approximative analytical expression for the spin-flip lifetime, and we find excellent agreement. We present results on how the spin-flip lifetime depends on the temperature T of a superconducting body as well as its thickness H. Finally, we study how nonmagnetic impurities as well as possible Eliashberg strong-coupling effects influence the spin-flip rate. It is found that nonmagnetic impurities as well as strong-coupling effects have no dramatic impact on the spin-flip lifetime.

• Rekdal, Per Kristian & Skagerstam, Bo-Sture (2006). Collective two-atom effects and trapping states in the micromaser. Physical Review A. Atomic, Molecular, and Optical Physics (PRA).  ISSN 1050-2947.  74(6) . doi: 10.1103/PhysRevA.74.063805 Show summary

  We investigate signals of trapping states in the micromaser system in terms of the average number ⟨n⟩ of cavity photons as well as a suitably defined correlation length of atoms leaving the cavity. In the description of collective two-atom effects we allow the mean number, ϵ, of pump atoms inside the cavity during the characteristic atomic cavity transit time to be as large as of order one. The master equation we consider, which describes the micromaser including collective two-atom effects, still exhibits trapping states for ϵ≠0, even for a mean number of atoms inside the cavity close to one. We, however, argue more importantly that the trapping states are more pronounced in terms of the correlation length as compared to ⟨n⟩, i.e., we suggest that trapping states can be more clearly revealed experimentally in terms of the atom correlation length. For axion detection in the micromaser this observable may, therefore, be an essential ingredient.

• Skagerstam, Bo-Sture; Hohenester, Ulrich; Eiguren, Aiser & Rekdal, Per Kristian (2006). Spin Decoherence in Superconducting Atom Chips. Physical Review Letters.  ISSN 0031-9007.  97(7) . doi: 10.1103/PhysRevLett.97.070401 Show summary

  Using a consistent quantum-mechanical treatment for the electromagnetic radiation, we theoretically investigate the magnetic spin-flip scatterings of a neutral two-level atom trapped in the vicinity of a superconducting body. We derive a simple scaling law for the corresponding spin-flip lifetime for such an atom trapped near a superconducting thick slab. For temperatures below the superconducting transition temperature Tc, the lifetime is found to be enhanced by several orders of magnitude in comparison to the case of a normal conducting slab. At zero temperature the spin-flip lifetime is given by the unbounded free-space value.

• Skagerstam, Bo-Sture; Hohenester, Ulrich; Eiguren, Asier & Rekdal, Per Kristian (2006). Relpy to Comment on "Spin Decoherence in Superconducting Atom Chips". arXiv. . doi: quant-ph/0610251
• Scheel, Stefan; Rekdal, Per Kristian; Knight, P.L. & Hinds, Edward (2005). Atomic spin decoherence near conducting and superconducting films. Physical Review A. Atomic, Molecular, and Optical Physics (PRA).  ISSN 1050-2947.  72(4) . doi: 10.1103/PhysRevA.72.042901 Show summary

  We derive scaling laws for the spin decoherence of neutral atoms trapped near conducting and superconducting plane surfaces. A result for thin films sheds light on the measurement of Y. J. Lin, I. Teper, C. Chin, and V. Vuletić [Phys. Rev. Lett. 92, 050404 (2004)]. Our calculation is based on a quantum-theoretical treatment of electromagnetic radiation near metallic bodies [P. K. Rekdal, S. Scheel, P. L. Knight, and E. A. Hinds, Phys. Rev. A 70, 013811 (2004)]. We show that there is a critical atom-surface distance that maximizes the spin relaxation rate and we show how this depends on the skin depth and thickness of the metal surface. In the light of this impedance-matching effect we discuss the spin relaxation to be expected above a thin superconducting niobium layer.

• Rekdal, Per Kristian; Scheel, Stefan; Knight, P.L. & Hinds, Edward (2004). Thermal spin flips in atom chips. Physical Review A. Atomic, Molecular, and Optical Physics (PRA).  ISSN 1050-2947.  70(1) . doi: 10.1103/PhysRevA.70.013811 Show summary

  We derive a general expression for the spin-flip rate of an atom trapped near an arbitrary dielectric body and we apply this theory to the case of a two-layer cylindrical metal wire. The spin-flip lifetimes we calculate are compared with those expected for an atom near a metallic slab and with those measured by Jones et al. above a two-layer wire [M.P.A. Jones, C.J. Vale, D. Sahagun, B.V. Hall, and E.A. Hinds, Phys. Rev. Lett. 91, 080401 (2003)]. We investigate how the lifetime depends on the skin depth of the material and on the scaling of the dimensions. This leads us to some conclusions about the design of integrated circuits for manipulating ultracold atoms (atom chips).

• Rekdal, Per Kristian; Skagerstam, Bo-Sture & Knight, Peter (2004). On the preparation of pure states in resonant microcavities. Journal of Modern Optics.  ISSN 0950-0340.  51(1), s 75- 84 . doi: 10.1080/09500340408234593 Show summary

  We consider the time evolution of the radiation field (R) and a two-level atom (A) in a resonant microcavity in terms of the Jaynes-Cummings model with an initial general pure quantum state for the radiation field. It is then shown, using the Cauchy-Schwarz inequality and also a Poisson resummation technique, that perfect coherence of the atom can in general never be achieved. The atom and the radiation field are, however, to a good approximation in a pure state ψAR=ψA×ψR in the middle of what has been traditionally called the ‘collapse region’, independent of the initial state of the atoms, provided that the initial pure state of the radiation field has a photon number probability distribution which is sufficiently peaked and phase differences that do not vary significantly around this peak. An approximate analytic expression for the quantity Tr[ρ2 A(t)], where ρA (t) is the reduced density matrix for the atom, is derived. We also show that under quite general circumstances an initial entangled pure state will be disentangled to the pure state ψPSAR

• Skagerstam, Bo-Sture & Rekdal, Per Kristian (2002). Noise and order in cavity quantum electrodynamics. Physica A: Statistical Mechanics and its Applications.  ISSN 0378-4371.  305(3-4), s 404- 426 . doi: 10.1016/S0378-4371(01)00553-2 Show summary

  In this paper we investigate the various aspects of noise and order in the micromaser system. In particular, we study the effect of adding fluctuations to the atom cavity transit time or to the atom–photon frequency detuning. By including such noise-producing mechanisms we study the probability and the joint probability for excited atoms to leave the cavity. The influence of such fluctuations on the phase structure of the micromaser as well as on the long-time atom correlation length is also discussed. We also derive the asymptotic form of micromaser observables.

• Skagerstam, Bo-Sture & Rekdal, Per Kristian (2002). Theory of the microscopic maser phase transitions. Physica A: Statistical Mechanics and its Applications.  ISSN 0378-4371.  315(3-4), s 616- 642 . doi: 10.1016/S0378-4371(02)01006-3 Show summary

  Phase diagrams of the micromaser system are mapped out in terms of the physical parameters at hand like the atom cavity transit time τ, the atom–photon frequency detuning Δω, the number of thermal photons nb and the probability a for a pump atom to be in its excited state. Critical fluctuations are studied in terms of correlation measurements on atoms having passed through the micromaser or on the microcavity photons themselves. At sufficiently large values of the detuning, we find a “twinkling” mode of the micromaser system. Detailed properties of the trapping states are also presented. Author Keywords: Micromaser; Phase transitions; Phase diagrams; Correlations PACS classification codes: 32.80.−t; 42.50.−p; 42.50.Ct

View all works in Cristin

• Rekdal, Per Kristian & Pettersen, Bård Inge (2020). MAT110 Statistikk 1: Eksamensoppgaver 2012-2019.
• Rekdal, Per Kristian & Pettersen, Bård Inge (2020). MAT110 Statistikk 1: Løsninger til eksamensoppgaver 2012-2019.
• Langelo, Erik; Pettersen, Bård Inge & Rekdal, Per Kristian (2019). The profit-maximizing lot size problem with pricing lag effects. Show summary

  In 1970, Joseph Thomas extended the well-known dynamic lot size model of Wagner and Whitin to include variable prices, as well as variable production costs. This master thesis extends Thomas’ model to include something called the “lag effect”. Formally, this master thesis models a disaggregated, finite-horizon, profit-maximizing dynamic lot size problem with pricing lag effects in demand. This effect models the tendency for customers to stock up on a product when it is offered for cheap, causing demand to increase in the “cheap” time period, while it decreases in the next. In effect, lowering the price causes demand to shift backwards in time, in addition to increasing demand as in most demand functions. The problem is to decide in which time periods to produce, how much to produce in each period, and which price to set in each period. The objective is to maximize the total profit, defined as total revenue minus total setup cost, production cost and inventory holding cost. Three theorems which restrict the amount of possible optimal solutions are proved. A solution is then provided to the production horizon problem, a sub-problem of the main problem. The production horizon problem is then solved with two different models: with and without the lag effect. The optimal solutions of these models are then compared for varying values of some key parameters. Keywords: revenue management and pricing, inventory

• Langelo, Erik; Pettersen, Bård Inge & Rekdal, Per Kristian (2019). The profit-maximizing lot size problem with pricing lag effects. Show summary

  In 1970, Joseph Thomas extended the well-known dynamic lot size model of Wagner and Whitin to include variable prices, as well as variable production costs. This work extends Thomas’ model to include something called the lag effect. Formally, this work models a disaggregated, finite-horizon, profit-maximizing dynamic lot size problem with pricing lag effects in demand. This effect models the tendency for customers to stock up on a product when it is offered for cheap, causing demand to increase in the given time period, while it decreases in the next. In effect, lowering the price causes demand to shift backwards in time, in addition to increasing demand as in most demand functions. The problem is to decide in which time periods to produce, how much to produce in each period, and which price to set in each period. The objective is to maximize the total profit, defined as total revenue minus total setup cost, production cost and inventory holding cost. Three theorems which restrict the amount of possible optimal solutions are proved. A solution is then provided to the production horizon problem, a sub-problem of the main problem. The production horizon problem is then solved with two different models: with and without the lag effect. The optimal solutions of these models are then compared for varying values of some key parameters.

• Rekdal, Per Kristian & Hystad, Joar (2019, 23. november). Fra tomme forelesningssaler til fulle klasserom i Molde — slik fikk de det til.  www.khrono.no.
• Rekdal, Per Kristian; Loge, Julia & Waage, sindre (2019, 24. november). Slik tredoblet de studentoppmøtet over natten. [Internett].  forskerforum.no.
• Rekdal, Per Kristian & Pettersen, Bård Inge (2019). MAT100 Matematikk : Kompendium 2019, del 1 : Brukes også i "MAT001 Forkurs i matematikk".
• Rekdal, Per Kristian & Pettersen, Bård Inge (2019). MAT100 Matematikk : Kompendium 2019, del 2.
• Rekdal, Per Kristian & Pettersen, Bård Inge (2019). MAT100 Matematikk : Kompendium 2019, del 3.
• Rekdal, Per Kristian; Pettersen, Bård Inge & Amundsgård, Herman (2019, 12. august). Innfører møteplikt for mattestudentene.  Romsdals Budstikke.
• Pettersen, Bård Inge & Rekdal, Per Kristian (2018). SCM200 Lager- og produksjonsplanlegging : eksamensoppgaver 2015 - 2017.
• Pettersen, Bård Inge & Rekdal, Per Kristian (2018). SCM200 Lager- og produksjonsplanlegging : løsningsforslag til eksamensoppgaver 2015 - 2017.
• Pettersen, Bård Inge & Rekdal, Per Kristian (2018). SCM200 Lager- og produksjonsplanlegging : samlig av øvingsoppgaver 2018.
• Rekdal, Per Kristian (2018). MAT110 Statistikk 1 : løsning til øvingsoppgaver 2018.
• Rekdal, Per Kristian (2018). MAT110 Statistikk 1 : samling av øvingsoppgaver 2018.
• Pettersen, Bård Inge & Rekdal, Per Kristian (2017). SCM200 Lager- og produksjonsplanlegging : kompendium V-2017 : del 1 av 2.
• Pettersen, Bård Inge & Rekdal, Per Kristian (2017). SCM200 Lager- og produksjonsplanlegging : kompendium V-2017 : del 2 av 2.
• Pettersen, Bård Inge & Rekdal, Per Kristian (2017). SCM200 Lager- og produksjonsplanlegging : samlig av løsningforslag til øvingsoppgaver 2017.
• Pettersen, Bård Inge & Rekdal, Per Kristian (2017). SCM200 Lager- og produksjonsplanlegging : samlig av øvingsoppgaver 2017.
• Rekdal, Per Kristian (2017). MAT110 Statistikk 1 : eksamensoppgaver 2012 - 2016.
• Rekdal, Per Kristian (2017). MAT110 Statistikk 1 : løsning til øvingsoppgaver 2017.
• Rekdal, Per Kristian (2017). MAT110 Statistikk 1 : løsningsforslag til eksamensoppgaver 2012 - 2016.
• Rekdal, Per Kristian (2017). MAT110 Statistikk 1 : samling av øvingsoppgaver 2017.
• Rekdal, Per Kristian (2017). hiMoldeX.no : open course platform.
• Bjerkeland, Øystein & Rekdal, Per Kristian (2016, 12. januar). Stort stryk på matte-eksamen.  Romsdals budstikke. Show summary

  30 prosent av studentene som tok eksamen ved Høgskolen i Molde før jul fikk strykkarakteren F i matematikk. I Kristiansund strøk halvparten av studentene.

• Rekdal, Per Kristian (2016). MAT100 Matematikk : eksamensoppgaver 2012 - 2016.
• Rekdal, Per Kristian (2016). MAT100 Matematikk : formelsamling H-2016.
• Rekdal, Per Kristian (2016). MAT100 Matematikk : kompendium H-2016 : del 1 av 2.
• Rekdal, Per Kristian (2016). MAT100 Matematikk : kompendium H-2016 : del 2 av 2.
• Rekdal, Per Kristian (2016). MAT100 Matematikk : løsning til øvingsoppgaver 2016.
• Rekdal, Per Kristian (2016). MAT100 Matematikk : løsningsforslag til eksamensoppgaver 2012 - 2016.
• Rekdal, Per Kristian (2016). MAT100 Matematikk : samling av øvingsoppgaver 2016.
• Rekdal, Per Kristian (2016). MAT110 Statistikk 1 : eksamensoppgaver 2012 - 2015.
• Rekdal, Per Kristian (2016). MAT110 Statistikk 1 : formelsamling : V-2016.
• Rekdal, Per Kristian (2016). MAT110 Statistikk 1 : kompendium V-2016 : del 1 av 2.
• Rekdal, Per Kristian (2016). MAT110 Statistikk 1 : kompendium V-2016 : del 2 av 2.
• Rekdal, Per Kristian (2016). MAT110 Statistikk 1 : løsning til øvingsoppgaver 2016.
• Rekdal, Per Kristian (2016). MAT110 Statistikk 1 : løsningsforslag til eksamensoppgaver 2012 - 2015.
• Rekdal, Per Kristian (2016). MAT110 Statistikk 1 : samling av øvingsoppgaver 2016.
• Rekdal, Per Kristian (2016, 11. juli). Nå kan du fullføre høgskolen fra sofakroken. [TV].  tv2.no.
• Rekdal, Per Kristian; Holme, Svein Ludvik & Waagbø, Arild Johan (2016, 07. november). Studenter krever mer undervisning på video.  http://panorama.himolde.no.
• Rekdal, Per Kristian; Nordhaug, Hans Fredrik & Waagbø, Arild Johan (2016, 25. august). Gulltilbud i matematikk for fjernstudenter.  http://panorama.himolde.no.
• Rekdal, Per Kristian & Resvoll, Liv-Inger (2016, 14. oktober). Digitalisering viktig for studentrekrutteringa. [Internett].  norgesuniversitetet.no.
• Silseth, Ingvild & Rekdal, Per Kristian (2016, 01. juni). Foreleser ved Høgskolen i Molde kan bli «årets formidler» : Per Kristian Rekdal er en av 39 finalister i Morgenbladets kåring.  Romsdals budstikke.
• Rekdal, Per Kristian; Bjerknes, Silje Steinnes; Ellingseter, Tore & Wisborg, Esben Blix (2015, 02. februar). På noregstoppen i fjernundervisning. [TV].  www.nrk.no.
• Rekdal, Per Kristian & Bondevik, Leiv-Erik (2015, 07. november). Satser for fullt på video. [TV].  www.nrk.no.
• Rekdal, Per Kristian; Haugen, Kjetil K. & Waagbø, Arild Johan (2015, 23. november). X-erne ses av 2-300 studenter daglig.  http://panorama.himolde.no.
• Rekdal, Per Kristian & Skagerstam, Bo-Sture (2015). Størst er ikke alltid best i forskning og utdanning. Romsdals Budstikke..  ISSN 0806-5160.
• Rekdal, Per Kristian (2014). Enriching students’ mathematics learning through YouTube and facebook.
• Rekdal, Per Kristian (2014). MAT110 Statistikk 1 : del 1 av 2 : våren 2014.
• Rekdal, Per Kristian (2014). MAT110 Statistikk 1 : del 2 av 2 : våren 2014.
• Rekdal, Per Kristian (2014). MAT110 Statistikk 1 : formelsamling : våren 2014.
• Rekdal, Per Kristian & Hagesæther, Pål Vegard (2014, 05. juni). En flom av norske nettilbud : Høgskolen i Molde er blant pionerene i Norge.  Aftenposten.
• Rekdal, Per Kristian & Hagesæther, Pål Vegard (2014, 05. juni). Harvard i spissen for utdanningsrevolusjon : flom av nye norske nettilbud.  Aftenposten.
• Rekdal, Per Kristian & Landsvik, Solveig Oterhals (2014, 11. november). Høgskolen utvider radiusen.  Romsdals budstikke. Show summary

  Studenter fra hele landet følger undervisning på video. 29 fag tilgjengelig. Bruker Facebook til fjernveiledning

• Rekdal, Per Kristian & Mathisen, Georg (2014, 03. mai). Atomfanger i verdenstoppen. [Internett].  forskning.no.
• Rekdal, Per Kristian & Waagbø, Arild Johan (2014, 02. juni). Facebook har størst gjennomslagskraft.  http:\\panorama.himolde.no.
• Waagbø, Arild Johan; Skagerstam, Bo-Sture & Rekdal, Per Kristian (2014, 04. juli). Kvantefysikere har sett lyset.  http://panorama.himolde.no.
• Waagbø, Arild Johan; Skagerstam, Bo-Sture & Rekdal, Per Kristian (2014, 11. juli). Vil tilby forskningen sin gratis på internett.  Khrono.no.
• Rekdal, Per Kristian (2013, 01. august). Distriktsnyheter Møre og Romsdal. [TV].  www.nrk.no.
• Rekdal, Per Kristian (2013, 12. juni). En ny verden har åpnet seg : flere studenter betyr mer inntekter for høgskolen.  www.rbnett.no.
• Rekdal, Per Kristian (2013, 01. september). Fotballspillere tar utdanning. [TV].  NRK TV : Sportsrevyen.
• Rekdal, Per Kristian (2013, 23. januar). HIM med åpne kurs. [Internett].  http://norgesuniversitetet.no/.
• Rekdal, Per Kristian (2013, 24. mai). Kombinerer fotball og studier via nett. [TV].  www.mfk.no.
• Rekdal, Per Kristian (2013). MAT100 Matematikk : del 1 (av 2) : høsten 2013.
• Rekdal, Per Kristian (2013). MAT100 Matematikk : del 2 (av 2) : høsten 2013.
• Rekdal, Per Kristian (2013). MAT100 Matematikk : formelsamling : høsten 2013.
• Rekdal, Per Kristian (2013). Open Access - for science and teaching.
• Rekdal, Per Kristian (2013, 01. september). Sportsrevyen. [TV].  www.nrk.no.
• Rekdal, Per Kristian (2013, 01. august). Viste kunnskapsministeren fremtiden. [TV].  NRK TV : Distriktsnyheter Møre og Romsdal.
• Rekdal, Per Kristian (2013). himoldeX.no - viktig for nærlingslivet i Molde?.
• Rekdal, Per Kristian & Gjerde, Anne (2013, 26. mai). Fotballproffer tester ny studieløsning.  www.dn.no.
• Rekdal, Per Kristian & Heiene, Marit (2013, 08. mai). Nobelprisvinner siterte Rekdal.  rbnett.no.
• Rekdal, Per Kristian & Skuseth, Torill (2013, 10. juni). Klar for å åpne opp på nett : som første høgskole i landet legger Høgskolen i Molde til høsten ut et komplett utdanningsløp åpent og gratis på nett.  www.rbnett.no.
• Rekdal, Per Kristian & Slåtto, Torhild (2013, 01. november). Klasseromsfølelsen skal med inn på nettet. [Tidsskrift].  Synkron 2013 nr. 3.
• Slåtto, Torhild & Rekdal, Per Kristian (2013, 14. november). Helt åpne læringsressurser fra Høgskolen i Molde : klasseromsfølelsen skal med inn på nettet. [Internett].  Synkron : magasin for innovativ utdanning, 2013 nr 3. Show summary

  Mens mooc-feberen slår inn på de nordiske universitetene, jobber Høgskolen i Molde etter en annen idé. Utdanning skal ut til folket, det vil si til dem som ikke kan komme til campus. Det skal være gratis for studenten, og det skal ikke koste for mye for høgskolen heller

• Rekdal, Per Kristian (2012). Basic research & theoretical physics in Molde.
• Rekdal, Per Kristian (2011). Physics & Quantum Computers at hiMolde.
• Rekdal, Per Kristian (2011). Utvalgte grunnleggende emner i matematikk - MAT001: Forkurs i matematikk.
• Skagerstam, Bo-Sture; Hohenester, Ulrich; Eiguren, Asier & Rekdal, Per Kristian (2006). Spin decoherence in atom chips.
• Rekdal, Per Kristian; Scheel, Stefan; Hinds, Edward A. & Knight, Peter L. (2005). Spin-flip lifetime of a trapped atom outside a dielectric body.
• Rekdal, Per Kristian; Scheel, Stefan; Hinds, Edward A. & Knight, Peter L. (2005). Spin-flip lifetime of a trapped atom outside a dielectric body.
• Rekdal, Per Kristian; Scheel, Stefan; Knight, Peter L. & Hinds, Edward A. (2003). Spontaneous spin flip rate of a ultra-cold atom near a hot cylindrical body induced by thermal fluctuations of a magnetic field.
• Rekdal, Per Kristian; Scheel, Stefan; Knight, Peter L. & Hinds, Edward A. (2003). Thermal spin flips in atom chips.

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