School of MathematicsSchool of Mathematicshttp://hdl.handle.net/2262/12015-04-26T22:36:03Z2015-04-26T22:36:03ZQuark-gluon plasma phenomenology from the latticeRYAN, SINEADhttp://hdl.handle.net/2262/737812015-04-18T02:02:44Z2014-01-01T00:00:00ZQuark-gluon plasma phenomenology from the lattice
RYAN, SINEAD
The FASTSUM Collaboration has calculated several quantities relevant for QCD studies
at non-zero temperature using the lattice technique. We report here our results for the (i)
interquark potential in charmonium; (ii) bottomonium spectral functions; and (iii) electrical
conductivity. All results were obtained with 2+1 flavours of dynamical fermions on an
anisotropic lattice which allows greater resolution in the temporal direction.
PUBLISHED
2014-01-01T00:00:00ZThe bottomonium spectrum at finite temperature from N f = 2 + 1 lattice QCDRYAN, SINEADhttp://hdl.handle.net/2262/737802015-04-18T02:02:44Z2014-01-01T00:00:00ZThe bottomonium spectrum at finite temperature from N f = 2 + 1 lattice QCD
RYAN, SINEAD
We present results on the bottomonium spectrum at temperatures above and
below the deconfinement crossover temperature,
T
c
, from dynamical lattice QCD simu-
lations. The heavy quark is treated with a non-relativistic effective field theory on the
lattice and serves as a probe of the hot medium. Ensembles with a finer spatial lattice
spacing and a greater range of temperatures below
T
c
than those previously employed by
this collaboration are used. In addition, there are
N
f
= 2 + 1 flavours of Wilson clover
quark in the sea with
M
π
≈
400 MeV and we perform a more careful tuning of the bottom
quark mass in this work. We calculate the spectral functions of S and P wave bottomonium
states using the maximum entropy method and confirm earlier findings on the survival of
the ground state S wave states up to at least 2
T
c
and the immediate dissociation of the
P wave states above
T
c
PUBLISHED
2014-01-01T00:00:00ZQuark-Gluon Plasma: From lattice simulations to experimental resultsRYAN, SINEADhttp://hdl.handle.net/2262/737792015-04-18T02:02:43Z2014-01-01T00:00:00ZQuark-Gluon Plasma: From lattice simulations to experimental results
RYAN, SINEAD
Theoretical studies of quarkonia can elucidate some of the important properties of
the quark–gluon plasma, the state of matter realised when the temperature exceeds
O
(150) MeV,
currently probed by heavy-ion collisions experiments at BNL and the LHC. We report on our
results of lattice studies of bottomonia for temperatures in the range 100MeV
T
450MeV,
introducing and discussing the methodologies we have applied. Of particular interest is the
analysis of the spectral functions, where Bayesian methods borrowed and adapted from nuclear
and condensed matter physics have proven very successful
PUBLISHED
2014-01-01T00:00:00ZBethe/gauge correspondence on curved spacesSHATASHVILI, SAMSONhttp://hdl.handle.net/2262/737762015-04-18T02:02:41Z2015-01-01T00:00:00ZBethe/gauge correspondence on curved spaces
SHATASHVILI, SAMSON
Bethe/gauge correspondence identifies supersymmetric vac
ua of massive gauge
theories invariant under the two dimensional
N
= 2 Poincare supersymmetry with the
stationary states of some quantum integrable system. The su
persymmetric theory can be
twisted in a number of ways, producing a topological field the
ory. For these theories we
compute the handle gluing operator
H
. We also discuss the Gaudin conjecture on the norm
of Bethe states and its connection to
H
PUBLISHED
2015-01-01T00:00:00Z