NOTE: This page is not up-to-date any more, and will not be updated in the future. Please consult my new homepage.

I work as a PhD student of Michael Müger and Klaas Landsman, in the mathematical physics group.

Contact details

Pieter Naaijkens
Pieter Naaijkens
Radboud University
FNWI / IMAPP / Mathematics
Postbus 9010
6500 GL Nijmegen
The Netherlands

You can visit me at:

 Huygens building, room HG 03.067
Heyendaalseweg 135, Nijmegen
Telephone:+31 (0)24 3652872
Fax:+31 (0)24 3553450
E-mail:p.naaijkens AT nospam DOT math DOT ru DOT nl
(please remove nospam part)


My current research interests are in local quantum physics and in category theory. In particular, I work on how structures arising in aQFT can be described categorically. My research focusses on connections with topological quantum computing. In particular, I am interested in rigorous treatment, using operator algebraic methods, of quantum spin models on an infinite lattice, from a local quantum physics viewpoint. In certain cases the superselection structure of such models can be described by braided tensor categories.


Articles and preprints

  1. Haag duality and the distal split property for cones in the toric code, 2011 (preprint)
  2. Localized endomorphisms in Kitaev's toric code on the plane
    Rev. Math. Phys. 23:347–373, 2011 (journal | preprint)
  3. On the extension of stringlike localised sectors in 2+1 dimensions
    Comm. Math. Phys. 303:385–420, 2011 (journal | preprint)
  4. Topologische kwantumcomputers: rekenen met vlechten
    Nieuw Arch. Wiskd. 11:187–193, sept. 2010, semi-popular, in Dutch (journal)
  5. Four-point functions of different-weight operators in the AdS/CFT correspondence (with L. Berdichevsky)
    JHEP 0801:071, 2008 (journal | preprint)


  1. Four-point functions of N=4 SYM4 in the AdS/CFT correspondence, Master's Thesis, Utrecht University, 2007
  2. Cartesisch gesloten deelcategoriëen van Top, Bachelor's Thesis, Utrecht University, 2004


Here you can find a selection of my talks.


I have taught in the following courses:

In August 2008, I gave a summer course (see here for information for participants) for high-school students who do not have the right prerequisites for admission to the mathematics bachelor program.

I also participated in the Sprint-Up program summer 2008 till summer 2010.


Starting September 2008, I am organising the PhD colloquium.

Past events


Some interesting weblog and websites: