My papers on arXiv: link.

Publications

• A geometric model of tube categories with R. Marsh, Journal of Algebra, 362, pp. 178 - 191.
  http://dx.doi.org/10.1016/j.jalgebra.2012.04.009
  link to arxiv version
  
  
• Categorification of a frieze pattern determinant with Robert Marsh, Journal of Combinatorial Theory Series A 119 (2012), pp. 1110-1122,
  DOI information: 10.1016/j.jcta.2012.02.006
  link to arxiv version
  
  
• On the complement of the dense orbit for a quiver of type A with L. Hille, link
  
  
• On the complement of the Richardson orbit with L. Hille, Math. Z., DOI: 10.1007/s00209-011-0920-9, link
  
  
• Geometric realizations of orbit categories to appear in Oberwolfach reports, 2011, link
  
  
• Polygone, Clusteralgebren und Clusterkategorien Article for a book (in German!) by Teubner Verlag, 2011, link
  
  
• Quasi-reductive (bi)parabolic subalgebras of reductive Lie algebras with A. Moreau. Annales de l'Institut Fourier, Vol. 61, no. 2, 2011, link
  
  
• D-filtered modules and nilpotent orbits of a parabolic subgroup in O_N with K. Erdmann and A. Parker, Journal of Pure and Applied Algebra, Vol. 215, Issue 5, 2011, link
  
  
• Secant dimensions of low-dimensional homogeneous varieties with Jan Draisma, Adv. Geometry, 10 (2010), no. 1 arXiv
  
  
• Frieze patterns for punctured discs with Robert Marsh. Appendix by Hugh Thomas. Journal of Algebraic Combinatorics, Vol 30, Issue 3 (2009) link
  
  
• A geometric description of the $m$-cluster categories of type $D_n$ with Robert Marsh International Mathematical Research Notices (2007) Vol. 2007 doi:10.1093/imrn/rnm011, link
  
  
• Richardson elements for parabolic subgroups of classical groups in positive characteristic with Simon Goodwin Algebr. Represent. Theory 11 (2008), no. 3, 275 - 297, link
  
  
• A geometric construction of $m$-cluster categories with Robert Marsh Trans. Amer. Math. Soc. 360 (2008), 5789-5803, link
  
  
• A class of gradings of simple Lie algebras with Nolan Wallach Cont. Math. 442 (2007), AMS, 3-15, link
  
  
• Secant Dimensions of Minimal Orbits: Computations and Conjectures with Jan Draisma, Willem de Graaf Experiment. Math. 16 (2007), no. 2, 239 - 250, link
  
  
• Richardson elements and birationality questions in Enveloping algebras and geometric representation theory, Oberwolfach Rep. 2, 2005, no. 1, 723 - 777, link
  
  
• Periodicity and growth in a lattice gas with dynamical geometry with J. Rabin, D. Meyer Physical Review E, 73, 026129 (2006), link
  
  
• Richardson elements for the classical Lie algebras Journal of Algebra (2006), Vol 297/1, 168 - 185, link
  
  
• A normal form for admissible characters in the sense of Lynch Represent. Theory 9 (2005), 30 - 45, link
  
  
• Nice Parabolic Subalgebras of Reductive Lie Algebras with Nolan Wallach Represent. Theory 9 (2005), 1 - 29, link
  
  
• Higher secant varieties of the minimal adjoint orbit with Jan Draisma Journal of Algebra (2004), 280/2, 743 - 761, link
  
  
• Cartan components and decomposable tensors Transformation Groups, 8 (2003), no. 4, 309 - 319, link

Preprints

• Torsion pairs and rigid objects in tubes with A.B. Buan and R.J. Marsh
  
  
• On the nilradical of a parabolic subgroup
  
  
• Combinatorial analogues of ad-nilpotent ideals for untwisted affine Lie algebras with V. Mazorchuk
  
  

General audience talk

• Triangulationen - Dreiecke als Grundbausteine von Polygonen. Slides of a talk at the Seniorenuniversitaet Zuerich (i.e. the University for retired people, Zurich), March 2011, pdf-file

Further work

• An overview talk on geometric models for cluster algebras and cluster categories, held at the Courant-Colloquium
  "Goettingen Trends in Mathematics", Goettingen, October 2007, pdf-file.


• Geometric construction of cluster algebras and cluster categories, pdf-file.
  This is an expanded version of a talk given at the Courant-Colloquium "Goettingen Trends in Mathematics"
  in Goettingen, October 2007. arXiv
  
  
• Cluster categories, m-cluster categories and diagonals in polygons.
  To appear in the proceedings of the Grenoble Summer School, Seminaires et Congres, S.M.F.
  This is an expanded version of a talk given at the Grenoble Summer School in 2008.


• A talk on the geometric description of m-cluster categories, pdf-file, February 2007.

• Lecture notes on Richardson elements pdf-file, May 2006.

• PhD Thesis: Two contributions to the representation theory of algebraic groups, pdf-file


• Diploma thesis: A covering construction in complex projective space, abstract.