I’m a postdoctoral fellow at the University of Adelaide. I work on bundle gerbes, 2-bundles, geometric stacks and internal groupoids and categories, and category theory more generally with a side interest in foundations.
If you need it, here is my email:
david dot roberts
(at symbol)
adelaide dot edu dot au
You may also find me on
Google+ (lots of open access stuff here)
On certain 2-categories admitting localisation by bicategories of fractions, arXiv:1402.7108. Submitted for publication 28 Feb 2014, rejected 29 Feb 2014. Resubmitted for publication 6 March 2014, rejected 2 April 2014.
The weak choice principle WISC may fail in the category of sets, arXiv:1311.3074. Submitted for publication 13 Jan 2014. Rejected 26 Sept 2014
A bigroupoid’s topology, arXiv:1302.7019. Submitted for publication 28 Feb 2014, rejected 29 Feb 2014. Resubmitted 10 June 2014.
The universal simplicial bundle is a simplicial group, New York Journal of Mathematics, Volume 19 (2013) 51-60, journal version, arXiv:1204.4886.
Simplicial principal bundles in parameterized spaces, arXiv:1203.2460, joint with Danny Stevenson. Submitted for publication 6 November 2012, rejected 14 November 2012. Resubmitted for publication 15 November 2012, rejected 16 February 2014.
On the existence of bibundles, Proc. London Math. Soc. (2012) 105 (6): 1290-1314, journal version, arXiv:1102.4388. Joint with Michael Murray and Danny Stevenson
Internal categories, anafunctors and localisations, Theory and Applications of Categories, Vol. 26, 2012, No. 29, pp 788-829, journal version, arXiv:1101.2363
Fundamental bigroupoids and 2-covering spaces, PhD thesis, University of Adelaide (2010). DSpace
The inner automorphism 3-group of a strict 2-group, Journal of Homotopy and Related Structures, vol. 3(1), 2008, pp.193–245, journal version, arXiv:0708.1741. Joint with Urs Schreiber.
Yang-Mills theory for bundle gerbes, Journal of Physics A: Mathematical and Theoretical 39:6039-6044, 2006, journal version, arXiv:hep-th/0509037. Joint with Mathai Varghese
Strict 2-sites, $J$-spans and localisations.
A relative smooth fundamental groupoid, joint with Andrew Stacey.
A relative topological fundamental groupoid.
Mapping groupoids of Lie groupoids and the bundle gerbe caloron transform, joint with Raymond Vozzo.
The Serre-Grothendieck theorem by geometric means, Differential geometry seminar, University of Adelaide, 24 October 2014. (Abstract)
A geometric proof of a theorem of Serre, Algebra and Topology seminar, Australian National University, 23 September 2014. (Abstract)
Mathematics: A castle in the sky?, School of Mathematical Sciences Undergraduate Seminar, University of Adelaide, 25 August 2014. (slides)
Explicit string bundles, Workshop on Higher Gauge Theory and Higher Quantization, Heriot-Watt University, June 2014. (notes from talk)
An explicit string bundle, Algebra/Geometry/Topology seminar University of Melbourne, 22 November 2013.
An explicit string bundle, AustMS 2013, 3 October 2013 (slides in WriteLaTeX).
Proper class forcing, CT2013, July 2013.
On the Ganter-Kapranov approach to supersymmetry, Strings Journal Club, University of Adelaide. 27 May 2013.
Diffeological spaces and differentiable stacks, Differential Geometry seminar, University of Adelaide. 10 May 2013.
On the Baas-Dundas-Rognes approach to 2-vector bundles, Strings Journal Club, University of Adelaide. 19 February 2013.
Elliptic cohomology - first steps, Strings Journal Club, University of Adelaide. 9 October 2012.
Sheaf cohomology via abelian categories, Strings Journal Club, University of Adelaide. 4 September 2012.
Introduction to 2-groups, Strings Journal Club, University of Adelaide. 5 May 2012.
2-categorical localisation, Australian Category Seminar, Macquarie University. 12 October 2011.
Functorial 2-connected covers, Differential Geometry seminar, University of Adelaide. 21 May 2010.
2-covering spaces, 2009 Annual Meeting of the Australian Mathematical Society, at the University of South Australia. 30 September 2009.
Fundamental 2-groups and 2-covering spaces, slides prepared for talk accepted for the Categorical groups workshop, Barcelona. June 2008. Due to lack of funding at the last minute, I wasn’t able to attend this conference, and my speaking slot was given up. See also this blog post.
Of inner automorphisms and universal bundles, Differential Geometry seminar, University of Adelaide. 26 October 2007.
Bundle gerbes, higher Yang-Mills and Kalb-Ramond, 2006 Annual Meeting of the Australian Mathematical Society, at Macquarie University. September 2006.
Bundle gerbe Yang-Mills, Erwin Schrodinger Institute, May 2006.
2014
2013
2007
Semester 2 : Maths 1B, Tutor
Semester 1: Maths 1A, Tutor
2006
Semester 2 : Maths 1B, Tutor
Semester 1: Maths 1A, Tutor
2005
My contributions to the nLab are released under a CC-BY 4.0 license. Indeed, when I can (for instance, all those of which I am solo author) I post my papers on the arXiv under a CC-BY license.