Poul Olesen
Poul Olesen (born 28 April 1939) is a Danish theoretical physicist, now emeritus at the Niels Bohr Institute in Copenhagen, whose name is attached to the Nielsen-Olesen vortex solution in gauge theories and the Koba-Nielsen-Olesen (KNO) scaling law for particle production in hadron collisions.1 • 2 His papers with Holger Bech Nielsen in the early 1970s included "A Parton view on dual amplitudes" and "Local field theory of the dual string", and his later papers reached into QCD confinement, turbulence, and cosmological magnetic fields.4 • 5 • 2
| Key fact | Detail |
|---|---|
| Born | 28 April 1939, Danish physicist1 |
| Position | Lektor (associate professor) at the Niels Bohr Institute from 1971, professor from 1998, now emeritus1 • 3 |
| Signature result | Nielsen-Olesen vortex solution in gauge theories1 |
| Most cited paper | "Vortex-line models for dual strings" (Nielsen and Olesen, Nuclear Physics B 61, 1973), 3,536 citations2 |
| Second most cited | KNO scaling paper (Koba, Nielsen and Olesen, Nuclear Physics B 40, 1972), 1,781 citations2 |
| Current research areas | Turbulence and theoretical particle physics3 |
Life and career
Olesen was employed at the Niels Bohr Institute (NBI) in Copenhagen first as lektor in 1971 and as professor from 1998.1 The institute's staff page now lists him as emeritus in theoretical high energy, astroparticle, and gravitational physics, based at Blegdamsvej 17 in Copenhagen, with active contact details.3
His connection to the wider Nordic and European community shows in his early affiliations. The 1970 paper "A Parton view on dual amplitudes" credits Holger Bech Nielsen at Nordita and P. Olesen at CERN.4
Scientific work
Dual amplitudes and the string picture. In May 1970 Nielsen and Olesen published "A Parton view on dual amplitudes" in Physics Letters B 32, pages 203-206, arguing that sums of very high order, unrenormalized planar Feynman diagrams lead to dual N-point functions, with a parton mass of order one GeV.4 The pair followed it in January 1973 with "Local field theory of the dual string" in Nuclear Physics B 57, pages 367-380.5
The Nielsen-Olesen vortex. Their most influential paper, "Vortex-line models for dual strings" (Nuclear Physics B 61, pages 45-61, 24 September 1973), introduced vortex strings in gauge theories by analogy with Abrikosov vortices in type II superconductors, laying the ground for the dual superconductor model of color confinement.6
KNO scaling. In 1972 Ziro Koba, Holger Bech Nielsen, and Olesen published "Scaling of multiplicity distributions in high energy hadron collisions" (Nuclear Physics B 40, pages 317-334), the paper that established what is still cited as KNO scaling.2
QCD confinement and later work. With N.K. Nielsen he published "An unstable Yang-Mills field mode" (Nuclear Physics B 144, 1978), and with Jan Ambjørn "On the formation of a random color magnetic quantum liquid in QCD" (Nuclear Physics B 170, 1980), both addressing the confinement problem.2 In 1996, with Axel Brandenburg and Kari Enqvist, he published "Large-scale magnetic fields from hydromagnetic turbulence in the very early universe" (Physical Review D 54).2 His listed current research areas are turbulence and theoretical particle physics.3
By the numbers
The distribution is heavily concentrated in work done half a century ago: the 1973 vortex paper (3,536 citations) and the 1972 KNO paper (1,781 citations) together account for roughly two-fifths of his total.2 The 1978 Yang-Mills instability paper, the 1980 QCD paper, and the 1996 cosmology paper form a second tier in the several-hundred-citation range.2
Collaborators and contemporaries
Olesen's Google Scholar profile lists his frequent co-authors as Jan Ambjørn, Mogens H. Jensen, Axel Brandenburg, Benny Lautrup, and Gordon W. Semenoff, alongside his two principal early collaborators, Holger Bech Nielsen and Ziro Koba.2 The Nielsen-Olesen partnership is the one that produced named results: the Nielsen-Olesen vortex, and the Koba-Nielsen-Olesen scaling law shared with Koba.
Compared with his most frequent collaborator, Olesen's career has been quieter in recent decades. Nielsen remained active at the Niels Bohr Institute into 2024, publishing an October 2024 paper in Entropy on the history of string theory's invention.7 That paper reviews the Veneziano-model era and dual models, the research program in which the 1973 Nielsen-Olesen vortex-string paper was central, showing that the work Olesen co-authored is still being actively reinterpreted by his contemporaries.7
Recent developments
No obituary or death notice has appeared: Olesen's official NBI staff page still lists him as emeritus with active contact details, and his listed research areas remain current.3 Nielsen's 2024 Entropy paper revisits the dual-model era, evidencing continued post-2023 engagement with that era of Olesen's work.7
References
- Poul Olesen, Lex (Danmarks nationalleksikon)
- Poul Olesen, Google Scholar profile
- Poul Olesen, Niels Bohr Institute staff page
- H.B. Nielsen and P. Olesen (1970). A Parton view on dual amplitudes. Physics Letters B 32, 203-206. INSPIRE-HEP record
- H.B. Nielsen and P. Olesen (1973). Local field theory of the dual string. Nuclear Physics B 57, 367-380. OSTI record
- Poul Olesen, nLab
- H.B. Nielsen (2024). String Invention, Viable 3-3-1 Model, Dark Matter Black Holes. Entropy 26, 830; arXiv:2409.13776
Topic: Encyclopedia › Physical world and mathematics › Physical and mathematical scientists › Physicists and astronomers › Researchers in particle, nuclear, and high-energy theoretical physics
Initially written Oct 10, 2026 · Edited: Oct 11, 2026; Oct 15, 2026; Oct 25, 2026
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