I joined the
particle theory group in the
Physics Department at the University of Washington in 1988.
My current research interests focus on
lattice gauge theory, in particular the calculation of weak matrix
elements which are needed to constrain the Standard Model
of particle physics, as well as the idea of "large-N reduction",
whereby in the limit of the large number of
colors one can reduce the volume of the theory to
a single point. I am involved in the US national lattice QCD collaboration,
"USQCD" (see links below).
I am also a member of the Particle Data Group (link below), and of the
Flavo(u)r Lattice Averaging Group (link below).
I am an editor of JHEP.
Professor of Physics
Department of Physics, University of Washington
I am looking for a student---please contact me if interested.
My previous graduate students
are Keith Clay (1995, joint with Steve Ellis, presently Chair of Physics
at Green River Community College), Yan Zhang (1997, was postdoc at Beijing U.,
presently running a company in Beijing),
Noam Shoresh (2001, joint with David B. Kaplan, first postdoc at Boston U,
now on the research staff at the Broad Institute, Cambridge, MA)
Ruth Van de Water (2005, first postdoc at Fermilab, second
at Brookhaven National Lab, now staff member at Fermilab),
Jackson Wu (2005, first postdoc at Triumf, Vancouver, second
at University of Bern, Switzerland, now at Univ. of Alabama),
Andrew Lytle (2009, first postdoc at Univ. Southampton, England,
second at TIFR, Mumbai, India, now at U. Glasgow, Scotland),
Max Hansen (2014, now postdoc at Mainz, Germany)
Derek Horkel (2016, now postdoc at Temple U.)
I was also the unofficial advisor of Greg Kilcup (1986, student at Harvard,
now faculty at Ohio State Univ.) and Mateusz Koren
(2013, visiting student from Krakow, now postdoc in DESY-Zeuthen).
Postdocs I have worked closely with and/or mentored are Jim Labrenz
(now at Pacific Biosciences, SF),
Weonjong Lee (now faculty at Seoul National Univ.),
Stefan Durr (now staff at Wuppertal Univ.),
David Lin (now faculty at NCTU, Taiwan) and
Barak Bringoltz (now at KLA-tencor, Israel).
I am an emeritus member of the executive committee of the
collaboration, which has obtained support from DOE
for computational resources and support.
I am a member of the
(Staggered fermion Weak Matrix Element)
I am a member of the
Particle Data Group
, having co-authored the
mini-review on Lattice QCD (v3: 2015)
with Jack Laiho and Shoji Hashimoto.
I am a member of the
Flavo(u)r Lattice Averaging Group
, which provides averages of results relevant for flavor physics
from lattice calculations. Our latest review (2016) is
Presentation on my research in Physics 528,
Nov 20, 2015.
Some recent talks and lectures:
"Multihadron physics from Lattice QCD",
invited talk at Santa Fe workshop on "Lattice QCD",
August 28, 2017.
"Lattice QCD: successes, challenges and future outlook",
colloquium at SFSU, March 13, 2017.
"Phase structure of Wilson and twisted-mass fermions in the
presence of isospin breaking",
seminars at the University of Mainz and Bonn, July 15 and 18, 2016.
"Future of Chiral Perturbation Theory for Lattice QCD",
invited talk at Technical University Munich-IAS symposium on
"Effective Field Theories and Lattice Gauge Theory",
May 19, 2016.
"Three particle scattering amplitudes from
invited talk at Yukawa Institute for Theoretical Physics, Kyoto, at
workshop on "Hadrons and Hadron Interactions in QCD",
March 20, 2015.
"Kaons and Long-distance Meson Mixing from Lattice QCD,"
invited talk at "Lattice QCD meets Experiment 2014",
workshop at Fermilab, March 7-8th, 2014.
"Can Eguchi-Kawai reduction provide a practical method for
studying large-Nc theories on the lattice?"
invited lecture at Cracow school of Theoretical Physics,
Zakopane, Poland, June 29, 2013.
Updated lectures on
"Effective field theories for lattice QCD"
"New Horizons in Lattice Field Theory"
Natal, Brazil, March 13-27, 2013
Overview and introduction to continuum chiral perturation theory.
Continuum ChPT completed: Adding sources; Next-to-leading chiral Lagrangian;
Examples of results; Heavy kaon ChPT; Finite volume effects in ChPT.
Including discretization errors in ChPT (mainly for twisted-mass fermions)
Partially quenched QCD and partially quenched ChPT plus
a discussion of whether m_up=0 is ambiguous.
at workshop on new fermion discretizations,
Feb, 2012, Yukawa Institute, Kyoto, 2012.
This talk has 2 parts. The first is
an investigation of whether one can use one staggered
fermion to study the lightest four physical flavors (u,d,s,c). My conclusion
is that it is impractical.
The second part is an analysis of the symmetries, vacuum and pion spectrum
of two types of "staggered-Wilson fermions": that proposed by Adams having
2 light fermions, and that proposed by Hoelbling (and its variants)
having either 1 or 2 light fermions. I conclude that the former scheme has
a number of attractive properties, while the later suffers from rotation
breakdown in the continuum limit, unless one adds counterterms and fine tunes.
at ECT* workshop on "Chiral Dynamics with Wilson fermions",
Oct. 24-28th, 2011, Trento, Italy.
This gives an introduction to Wilson Chiral Perturbation Theory
and the predictions for the phase structure at non-zero lattice
spacing, and presents some new work with student Max Hansen.
An old but still relevant plenary talk
Lattice 2006, Tucson, Arizona, July 23-28, 2006)
I organized a summer school at the INT in 2007 on
``Lattice QCD and its applications''.
Teaching (recent plus some old classes)
- WINTER 2017 (open)
High Energy Physics.
- AUTUMN 2016 & SPRING 2016 (behind Canvas firewall) & AUTUMN 2015 (open)
Particles and Symmetry.
- WINTER 2016 (behind Canvas firewall):
- SPRING 2015:
Physical Applications of Group Theory.
- WINTER 2015:
Elementary Mathematical Physics, Part 2.
- AUTUMN 2014:
Elementary Mathematical Physics, Part 1.
- SPRING 2014:
Lattice Field Theory and its Applications.
- SPRING 2011:
Graduate QM (third quarter).
- WINTER 2011:
Graduate QM (second quarter).
- AUTUMN 2010:
Graduate QM (first quarter).
- WINTER 2009:
Physics 486 and 495:
Seminar on Current Problems in Physics and Senior Honors Seminar.
- AUTUMN 2008:
Graduate Mechanics (and an introduction to chaos).
- AUTUMN 2005:
- SPRING 2004:
Waves (honors section).
- WINTER 2004:
Electromagnetism and Oscillatory Motion (honors section).
- AUTUMN 2003:
Mechanics (honors section).
US mail: Stephen R. Sharpe
Department of Physics
University of Washington
Seattle, WA 98195-1560
Office: B406 Physics-Astronomy Building
Phone: (206) 685-2395
FAX: (206) 543-5923 or 685-0635
Last modified: 6/14