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NAME
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AFFILIATION
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TITLE/ABSTRACT OF TALK
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DINNER
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Eugen
Radu
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NUI Maynooth |
On NUT-charged solutions in anti-de Sitter space-time
We consider the
thermodynamic properties of $(D+1)$-dimensional
spacetimes with NUT charges. Such
spacetimes are asymptotically
locally anti-de Sitter, with non-trivial topology in
their spatial sections,
and can have fixed point sets of the Euclidean time
symmetry that are
either $(D-1)$-dimensional (called
"bolts") or of lower dimensionality
(pure "NUTs"). We argue also that the conjectured
AdS/CFT correspondence
may teach us something about the physics in spacetimes
containing closed
timelike curves.To this aim, we use the observation that
the boundary
metric of a $(D+1)$-dimensional Taub-NUT-AdS
solution provides a
$D$-dimensional generalization of the known G\"odel-type
spacetimes.
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Yes
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Marianne
Leitner
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DIAS
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Zero Field Hall Effect and Spontaneous Edge Currents
Quantum electrodynamics in 2+1 dimensions with a
massive fermion
yields an instructive example of a Hall current without magnetic field.
The Hall conductivity is half integral. Its classical topological
interpretation
as a Chern number fails, but quantisation can be traced back to
geometry.
For systems with boundary, spontaneous edge currents are predicted. The
edge
conductivity is integral, in contrast to the non-relativistic
situation, where bulk
and edge conductivity are equal. This results from the dependence of
the edge
conductivity on the choice of a selfadjoint extension of the Dirac
Hamiltonian.
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No
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Seckin
Kurkcuoglu
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DIAS
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Waves on Noncommutative Spacetimes
Waves on ``commutative'' spacetimes like R^d are
elements of the
commutative algebra C^0(R^d) of functions on R^d. When C^0(R^d)
is deformed to a noncommutative algebra A_theta (R^d) with deformation
parameter \theta waves being its elements, are no longer complex-valued
functions on R^d. Rules for their interpretation, such as measurement
of
their intensity, thus need to be stated. In this talk I will first
address this
task and then apply these rules to interference and diffraction for d
\leq 4
and with time-space noncommutativity. Novel phenomena are encountered.
Thus when the time of observation T is so brief that T \leq 2 \theta w,
where
w is the frequency of incident waves, no interference can be observed.
For larger times, the interference pattern is deformed and depends on
\frac{\theta w}{T}. It approaches the commutative pattern only when
\frac{\theta w}{T} goes to 0. As an application, we discuss
interference of
star light due to cosmic strings. This talk is based on a recent work
(hep-th/0503087) which the speaker pursued with A.P. Balachandran and
Kumar S. Gupta.
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No
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Dmitri
Grigoriev
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NUI Maynooth
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Dynamics of proton decay in Skyrme-monopole system
We present the first results for direct numerical
simulation of
real-time dynamics of Skyrmion decay catalysed by 't Hooft-Polyakov
monopole. The simplest spherically-symmetric case of Skyrmion exactly
overlapping with the monopole is being considered. It is shown that
the existing quasistatic results for Skyrmion decay in this geometry
are not adequate for predicting the decay rate, with the latter being
of
purely dynamical origin. Work done in collaboration with Y.Brihaye,
V.Rubakov and T.Tchrakian.
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Yes
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Chris
Ford
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TCD Math
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Fermionic zero modes and self-duality
Old and new results concerning Dirac-Weyl zero modes
in self-dual
backgrounds (Abelian and non-Abelian) are discussed.
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Yes
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Aybike
Ozer
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TCD Math |
Duality Twists, Flux Compactifications and T-duality
We study torus compactifications of string/M theory
with duality twists.
If the twist is in the geometric SL(n, Z) subgroup of the U-duality
group,
then this can be lifted to a compactification on a non-trivial torus
bundle. In other cases, it provides non-geometric backgrounds. Such
non-geometric backgrounds appear as T-duals of certain H-flux
compactifications, which themselves can arise due to
compactifications with certain duality twists. So, such
compactifications
provide a natural framework, in which one can discuss the interplay of
H-flux
and geometry under T-duality. We illustrate these ideas by the
particular
example of a compactification with S-duality twist.
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No
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Mike
Peardon
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TCD Math |
A path integral representation of one flavour of
staggered fermions.
The staggered fermion is a numerically efficient
lattice
representation of the Dirac action. Unfortunately, describing a
single fermion flavour in this scheme is done in an extremely ad hoc
manner. I will present an attempt to investigate whether the
staggered fermion can be put on a more robust theoretical foundation.
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Yes
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Keisuke
Juge
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TCD Math |
Pentaquark candidates on the lattice
A lattice simulation of a possible pentaquark
candidate
will be presented and compared to other lattice QCD
calculations.
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Yes
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Alan O
Cais
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TCD Math |
A new method for lattice hadron spectroscopy
In light of the computational cost of generating
dynamical gauge
configurations, we address the short-comings of standard point-to-all
techniques in lattice QCD hadron spectroscopy. We propose a new method
to calculate the
all-to-all lattice quark propagator and examine the error performance
of this method. We also
compare it with the point-to-all method and note the all-to-all methods
increased
resolution, decreased errors and its ability to calculate quantities
either inaccessible or poorly estimated
by other techniques.
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Yes
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James
Drummond
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TCD Math |
Deformations of maximally supersymmetric gauge theories and brane
dynamics.
Maximally supersymmetric gauge theories are
described in superspace by constrained superfields.
Cohomological techniques can be used to construct
deformations of the constraints in a manner which preserves maximal
supersymmetry. We apply such ideas to the constraints of the
superembedding formalism which allows the calculation of
string-theoretic and M-theoretic derivative corrections to brane
dynamics.
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No
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Fernando
Garcia Flores
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DIAS
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Phase diagram for the \phi^4 scalar field theory on
S^{2}_{F} via Monte Carlo Simulations.
The properties of the \phi^4 scalar field theory on
a fuzzy sphere are studied numerically. The fuzzy sphere is a
regularization of the sphere through of matrices. In this
approximation, the symmetries of the space are preserved. This model
present three different phases, uniform and disorder, associated with
the usual commutative sphere and non uniform order phase related to
non-commutative effects on the sphere. We have determined the
coexistence lines between phases as well as their triple point.
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Yes
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Rodrigo
Blando
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DIAS
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Matrix Models and Gauge Theory
In this talk we present a matrix model which is
invariant under unitary transformations. As we
will point it out, with this model is possible
to study a very wide range of different field
theories of interest in physics.
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No
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