I can be reached at:

The University of Texas at Austin

Mathematics Dept. RLM 8.100

Attn: Andrew Neitzke

2515 Speedway Stop C1200

Austin, TX 78712-1202

Office: RLM 9.134

neitzke@math.utexas.edu, PGP public key

Mathematics Dept. RLM 8.100

Attn: Andrew Neitzke

2515 Speedway Stop C1200

Austin, TX 78712-1202

Office: RLM 9.134

neitzke@math.utexas.edu, PGP public key

My surname is most correctly pronounced "Night-Ski".

I am co-organizer of the Geometry and String Theory Seminar at UT Austin; the calendar for this seminar is here.

I am also helping to organize the conference Between Topology and Quantum Field Theory, January 14-18, 2019, in honor of Dan Freed's 60th birthday.

Exact WKB and abelianization for the T3 equation.
1906.04271
[ ]

BPS states in the Minahan-Nemeschansky E7 theory.
1905.09879
[ ]

On the BPS Spectrum of the Rank-1 Minahan-Nemeschansky Theories.
1901.09929
[ ]

Secondary products in supersymmetric field theory.
1809.00009
[ ]

Asymptotics of Hitchin's metric on the Hitchin section.
Commun. Math. Phys.
1802.07200
[ ]

From S^1-fixed points to W-algebra representations.
1709.06142
[ ]

Line defect Schur indices, Verlinde algebras and U(1)_r fixed points.
JHEP.
1708.05323
[ ]

Integral iterations for harmonic maps.
1704.01522
[ ]

Opers versus nonabelian Hodge.
J. Diff. Geom. (to appear)
1607.02172
[ ]

BPS states in the Minahan-Nemeschansky E6 theory.
Commun. Math. Phys.
1607.01743
[ ]

Cluster-like coordinates in supersymmetric field theory.
Proceedings of the National Academy of Sciences.
PNAS link
[ ]

Notes on a new construction of hyperkahler metrics.
In proceedings of the conference *Mirror Symmetry & Tropical Geometry*, Cetraro 2011.
1308.2198
[ ]

Four-dimensional wall-crossing via three-dimensional field theory.
Commun. Math. Phys. 299 (2010) 163-224.
0807.4723
[+]

Background Independence and the Open Topological String Wavefunction.
In "From Hodge theory to integrability and TQFT" (2008), American Mathematical Society.
0709.2390
[+]

For a fuller list of my papers see
inSPIRE.
WKB and abelianization.
Austin, 2018.
Notes

Precision studies of nonabelian Hodge for irregular Higgs bundles on CP^1.
GEAR retreat, 2017.
Notes, Video

Abelianization and Chern-Simons theory.
QGM Aarhus, 2017.
Notes

Abelianization, WKB and Chern-Simons theory.
Stanford, November 2016.
Notes

Some uses of defects in quantum field theory.
Aspen Center for Physics, July 2016.
Slides

Hitchin systems, spectral networks and noncommutative clusters.
MSRI, March 2016.
Notes

WKB and the conformal limit.
Montreal, January 2016.
Notes

Some new geometric applications of quantum field theory.
Bonn (Panorama of Mathematics), October 2015.
Slides

A smooth R^3 index for four-dimensional N=2 theories.
Princeton (STRINGS 2014), June 2014.
Slides

Spectral networks and their uses.
Pisa, June 2014.
Notes

Gluing construction for a hyperholomorphic line bundle.
UC Davis, May 2014.
Notes

Open string mirror symmetry and Hitchin systems.
Miami, January 2014.
Notes

Spectral networks in 2 and 3 dimensions.
String-Math, June 2013.
Notes (with animations), Video

On the utility of the equation 2+4=6 in supersymmetric quantum field theory.
Austin (physics colloquium), February 2013.
Notes

Introduction to wall-crossing (through spaces of quadratic differentials).
IHES, November 2011.
Notes, Video

A 2d-4d wall-crossing formula.
Cetraro, July 2011.
Slides

Hitchin systems and enumerative invariants.
Michigan, December 2010.
Slides

2d-4d wall-crossing and hyperholomorphic bundles.
DESY, December 2010.
Slides

4d and 2d-4d wall-crossing.
Simons Center for Geometry and Physics, August 2010.
Video

BPS wall-crossing, field theory and hyperkahler geometry.
Oxford, June 2009.
Notes

Asymptotic quasinormal mode frequencies.
Penn State, May 2008.
Notes

An idiosyncratic view of the holomorphic anomaly of the topological string.
Northwestern, February 2008.
Notes

Quantum Maxwell theory.
IAS, September 2007.
Notes

PCMI lectures on BPS states and spectral networks.
(Last update: 28 Oct 2019)
Draft

On the metrics on moduli spaces of Higgs bundles.
(Last update: 4 Jun 2019)
Draft

Comparing signs in wall-crossing formulas.
(Last update: 30 Jul 2016)
Draft

What is a BPS state?
(Last update: 30 Jul 2016)
Draft

The CurvesGraphics6 notebook by Gianluca Gorni is available here; this notebook contains instructions on how to generate the file CurvesGraphics6.m, which is used by the spectral network notebook below.

Notebook for plotting spectral networks.
(Last update: 30 Jul 2016)
Notebook

So far only the raw videos are here; some organizational superstructure and guidance about prerequisites will follow.

What is mirror symmetry?
Video

The Kaluza-Klein mechanism.
Video