Dublin Theoretical Physics Colloquium
Synge Lecture Theatre
Hamilton Building
Mondays
4:15 pm
Month 
Date 
Speaker 
Title 
October 
8 
Gabriele Travaglini (Queen Mary, U.) 
Twistors, scattering amplitudes, and Wilson loops 
October 
15 
Romuald
Janik
(Jagiellonian
U.)

Wrapping interactions and finite size effects

October 
22 
Lilia Anguelova (Queen Mary, U.) 
"O'KKLT at Finite Temperature" 
October 
29 
bank holiday 

November 
5 
Volker Schomerus (DESY) 
String duality in curved backgrounds 
November 
12 
Mohab AbouZeid (Vrije U., Brussels) 
Twistor Strings and Supergravity 
November 
19 
Werner Nahm (DIAS,
Dublin)

Finite size corrections to the thermodynamic Bethe ansatz 
November 
26 
Radu Roiban (Penn State U.) 
The cusp anomalous dimension at weak and
strong coupling in N=4 superYangMills theory 
December 
3 
Fernando Quevedo (Cambridge) 
Phenomenological and Cosmological
implications of large volume string compactifications 
December 
10 
winter break 

December 
17 
winter break 

December 
24 
winter break 

December 
31 
winter break 

January 
7 
Ilka
Brunner
(Zurich)

On defects and their fusion

January 
14 
Margarita
GarciaPerez (Madrid)

Nonperturbative physics in the Early Universe 
January 
21 


January 
28 
Johanna
Knapp
(CERN)

Topological Strings, Matrix Factorizations
and Deformations 
February 
4 
Richard Thomas (Imperial College) 
Counting curves in CalabiYau 3folds 
February

11 
Fernando Alday (Utrecht U.) 
Scattering Amplitudes and AdS/CFT 
February 
18 
Alexander
Quintero Velez
(Utrecht
U.)

McKay
correspondence for LandauGinzburg models 
February 
25 
Jan Plefka 
Absence of
Gravitational Corrections to the Running Gauge Coupling

March 
3 
Gregory
Korchemsky
(LPT, Orsay) 
Gluon
scattering amplitudes/Wilson loops duality in N=4
super YangMills theory 
March 
10 
spring break 

March 
17 
spring break 

March 
24 
spring break 

March 
31 
Wolfgang Lerche (CERN) 
Canceled 
April 
7 
conference 

April 
14 
Anton Gerasimov 
On Whittaker functions and related
structures 
April 
21 


April 
28 
Peter
Weisz
(Munich, Max Planck Inst.) 
Correlation
functions of the 2d nonlinear O(n) sigma models 
May  5 
holiday  
May 
12 
holiday 

May 
19 
summer break 

Lilia Anguelova (Queen Mary, U.)
Title: O'KKLT at Finite
Temperature
Abstract: Moduli
stabilization is a crucial step on the road to relating string
compactifications and phenomenology. To achieve it, it is essential to
consider nonzero background fluxes and to also take into account certain
quantum effects. However, the result is usually a supersymmetric ground
state. Understanding how it can be lifted to a dS vacuum is a rather
nontrivial additional problem. It was recently realized that this
problem can be resolved by coupling to a field theory sector that
exhibits
metastable dynamical susy breaking. This setup however raises the
question: How natural is it for a system to be in a metastable state
rather than in its global vacuum? The answer turns out to be in the
specifics of the evolution of the system at finite temperature. We
address
these issues in the context of a particular model with a dS vacuum and
stabilized moduli, namely the KKLTO'Raifeartaigh (called for brevity
O'KKLT) model.
Fernando Quevedo (Cambridge)
Title:
Phenomenological and Cosmological implications of LARGE volume
string compactifications
Contact:
Office: 3.4 Hamilton Building, Trinity College
Phone: +353 1 896 4027
Email: frolovs@maths.tcd.ie
Month 
Date 
Speaker 
Title 
September 
14 
Tamas Hausel (Oxford) 
Mixed Hodge Polynomials of Character Varieties 
October 
9 
Samson Shatashvili (Trinity College Dublin) 
Higgs Bundles, Gauge Theories and Quantum Groups 
October 
16 
no seminar because 
of RIA Hamilton Lecture at 7.15pm 
October 
23 
Matthias Staudacher (AlbertEinstein Institute, Potsdam) 
Large Spin Twist Operators, Gluon Amplitudes, and AdS/CFT 
October 
30 
bank holiday 

November 
6 
Stefano Kovacs (Trinity College Dublin) 
Ultraviolet finiteness of planar betadeformed YangMills 
November 
13 
Maria Paola Lombardo (INFN, Frascati) 
Quark Gluon Plasma, and the phases of QCD in the T, \mu^2 plane 
November 
20 
Michael Green (Cambridge) 
Nonrenormalization
in string theory and Mtheory

November 
27 
Gleb Arutyunov (Utrecht) 
The offshell
symmetry algebra of the lightcone AdS_5 x S^5 superstring 
December 
4 
Yasha Shnir (Institute of Physics, Oldenburg) 
Monopoleantimonopole chains and closed vortices in YangMillsHiggs and EinsteinYangMillsHiggs theory 
December 
11 
winter break 

December 
18 
winter break 

December 
25 
winter break 

January 
1 
winter break 

January 
8 
Tristan McLoughlin (Penn State U.) 
Worldsheet Scattering and AdS/CFT 
January 
17 
Alastair King (University of Bath) 
Dimers and noncommutative CalabiYau 3folds 
January 
22 
Arkady Tseytlin (Imperial College) 
Sigma model RG flow and Perelman's entropy 
January 
29 
Neil Lambert 
The
Mtheory Geometry of Fermionic Open String Modes

February 
5 
Simon Hands 
Lattice QCD approach to Quark Matter 
February 
12 
Kelly
Stelle
(Imperial College)

Is N=8 Supergravity finite? The debate
about UV divergences in 
February 
19 
Vladimir Kazakov (Ecole Normal, Paris) 
Supersymmetric Bethe Ansatz and Baxter Equations
from Discrete 
February 
26 
Anne Taormina 
Liouville
field, Modular forms and Elliptic genera

March 
5 
Manfred Herbst 
Phases
of N=2 theories in two dimensions with boundary

March 
12 
spring break 

March 
19 
spring break 

March 
26 
spring break 

April 
2 
O Colgain, Eoin (Imperial College) 
4d CFTS with Mtheory duals 
April 
9 
holiday 

April 
16 
Lionel Mason 
From twistorstrings to quantum gravity 
April 
23 
Rainer Sommer 
Nonperturbative Heavy Quark Effective Theory 
April 
30 
Sergey Cherkis 
Instantons
on Gravitons

May  3 
Eliezer Rabinovici (The Hebrew University) 
Little Hagedorn Holography 
May 
7 
holiday 

May 
14 
summer break 

Sergey Cherkis (TCD)
Instantons on Gravitons
We present a construction of YangMills Instantons on
Asymptotically Locally Flat Gravitational Instantons. To
illustrate
the construction we explicitly compute the metric on the moduli space
of one instanton on TaubNUT space and find the one instanton
solution. These results can be applied to the study of the
supersymmetric inhomogeneity theories as well as to N=4 three
dimensional SeibergWitten theories.
Eliezer Rabinovici (The Hebrew University)
Little Hagedorn
Holography
We disucss the issue of a Hagedorn spectrum in Little String Theory.
/////////////////////////////////////////////////////////////////
Rainer Sommer (DESY
Zeuthen)
Nonperturbative Heavy Quark Effective
Theory
The future of flavour physics will require higher
and higher precision in order to determine the
standard model quark mixing matrix and in particular
to uncover contributions of physics beyond the
standard model. A rather precise knowledge of
hadronic matrix elements will be necessary to
make full use of the available experimental
information. Lattice gauge theory offers the
computational tool to compute a number of these
matrix elements.
We discuss the challenges that lattice gauge theories
are facing, in particular in the treatment of
beauty quarks. The development of a fully nonperturbative
formulation of Heavy Quark Effective Theory will
be explained in detail. This includes the determination
of the parameters of the effective theory from QCD,
thus preserving the predictivity of QCD.
Lionel Mason (Oxford)
From twistorstrings to quantum gravity
O Colgain, Eoin (Imperial
College)
4d CFTS with Mtheory duals
Manfred Herbst (DESY)
Phases of N=2 theories in two
dimensions with boundary
N=(2,2) gauged linear sigma model in two dimensions provided a quite
efficient concept for describing geometric transitions like flops
between
CalabiYau manifolds and even transitions to nongeometric models such
as
LandauGinzburg orbifold. In this talk we will consider Btype Dbranes
in these models and study, in particular, their behaviour under
deformations of the Kaehler moduli.
Anne Taormina (Durham)
Liouville field, Modular forms and Elliptic genera
The elliptic genus of the K3 surface yields, in the
decompactification limit of the surface,
a candidate formula for the elliptic genus of the singular A_1 ALE
space.
We generalize this elliptic genus to A_N ALE spaces and show it
coincides
with the expression obtained when pairing the N=2 minimal and N=2
Liouville theories.
Vladimir Kazakov (Ecole Normal, Paris)
Supersymmetric Bethe
Ansatz and Baxter Equations from Discrete
Hirota Dynamics
Simon
Hands
(Swansea)
Neil Lambert (King's
College)
The Mtheory Geometry of Fermionic
Open String Modes
We will discuss the lift to Mtheory of a D4D6 intersection. In
particular the open string that stretches between to D4 and D6 branes
gives
rise to a charged chiral Fermion. We discuss the appearance of this
mode in the
M5brane worldvolume theory as well as some interesting features
associated
with its interpretation.
Arkady Tseytlin
(Imperial
College London)
Sigma model RG flow and Perelman's entropy
Tristan McLoughlin (Penn State U.)
Worldsheet Scattering and AdS/CFT
The realization that both the worldsheet theory on AdS_5xS^5 and
N=4 SYM can, in certain limits, be described by integrable systems
has lead to a good deal of recent progress in understanding
the AdS/CFT correspondence.
In this talk we will review the perturbative construction of the
worldsheet Smatrix in the lightcone gauge and discuss the realization
of
the global symmetries on asymptotic states. A mild nonlocality of the
supercharges results in the natural appearance of a nontrivial
coproduct
and we will outline how the symmetries form a Hopf algebra. At leading
order this scattering matrix can be compared with the well known
conjectures for the allloop asymptotic Smatrix that enters the Bethe
equations for gauge theory anomalous dimensions and we will show that
they
are in good agreement. This Smatrix provides a convenient description
of
the two theories and should eventually allow us to compare the complete
spectrum on both sides of the duality. Further, we will outline some
partial attempts to extend this equivalence, and the corresponding
integrable structures, to include worldsheet quantum loop effects.
Dimer models, introduced by Hanany et al, are expected to
provide noncommutative crepant resolutions of toric 3fold Gorenstein
singularities. This is an introductory talk which will discuss what
these
terms mean and why the expectation is reasonable.
/////////////////////////////////////////////////////////
Matthias Staudacher
AlbertEinstein Institute, Potsdam
Large Spin Twist Operators, Gluon Amplitudes, and AdS/CFT
We discuss recent developments in relating the anomalous dimensions
of large spin twist operators in N=4 gauge theory to (a) space time
gluon amplitude calculations and to (b) string theory via the
AdS/CFT correspondence.
Stefano Kovacs
Trinity College Dublin
Ultraviolet finiteness of planar
betadeformed YangMills
usually referred to as betadeformed N=4 super YangMills, has only
N=1 supersymmetry and a U(1)xU(1) flavour symmetry. I will show that
the introduction of a suitably defined superspace starproduct allows
to formulate the theory in N=4 lightcone superspace. I will then use
this formulation to show that the theory is conformally invariant, in
the planar approximation, by proving that its Green functions are
ultraviolet finite to all orders in perturbation theory.
Maria Paola Lombardo
Istituto Nazionale di Fisica Nucleare, Frascati(Roma) Italy
Quark Gluon Plasma, and the phases of QCD in the T, $\mu^2$ plane.
At high temperature and/or baryon density QCD undergoes a
transition to a new phase, whose properties are under
theoretical and experimental investigations.
By use of an imaginary $\mu$  which avoids the sign problem of
finite density QCD  we can explore a relatively large region of
the QCD phase diagram in the T, $\mu$^2 plane, including
the highly nonperturbative phase $T_c < T < 2 T_c$. In the first
part of the talk I will introduce the various methods for analytic
continuation from imaginary to real chemical potential, and discuss
the results for the critical line. In the second part I will focus
on the hot region, where the consideration of the critical behaviour
at imaginary chemical potential affords a new, simple description
of the properties of the strongly interactive Quark
Gluon Plasma.
Michael Green (Cambridge)
"Nonrenormalization in
string theory and Mtheory".
The study of Feynman diagrams of elevendimensional supergravity leads
to
detailed statements concerning nonperturbative features of the low
energy
limit of string theory in lower dimensions. Together with certain
wellestablished duality relationships this gives rise to some powerful
nonrenormalization statements that suggest that supergravity itself has
milder ultraviolet divergences than might have been expected.
Gleb Arutyunov (Utrecht)
The offshell symmetry algebra of the lightcone AdS_5 x S^5 superstring
We analyze the psu(2,24) supersymmetry algebra of a
superstring propagating
in the AdS_5 x S^5 background in the uniform lightcone gauge.
We consider the offshell theory by relaxing the levelmatching
condition
and take the limit of infinite lightcone momentum, which
decompactifies the
string worldsheet.
We focus on the psu(22)+psu(22) subalgebra which leaves the lightcone
Hamiltonian invariant and show that it undergoes extension by a central
element which is expressed in terms of the levelmatching operator.
This result is in agreement with the conjectured symmetry algebra of the
dynamic Smatrix in the dual N=4 gauge theory
Yasha Shnir (Institute
of Physics, Oldenburg)
Monopoleantimonopole chains and
closed vortices in YangMillsHiggs and
EinsteinYangMillsHiggs theory.
We discuss properties of the axially symmetric static saddle point
solutions of SU(2) YangMillsHiggs theory which represent composite
states of monopoles and antimonopoles and/or vortex rings. They are
either
deformations of the topologically trivial sector or deformations of the
axially symmetric charge n multimonopole. The energy of these
configurations exceeds the Bogomol'nyi bound even in the limit of
vanishing scalar coupling. When the theory is coupled with gravity new
branches of the graviting monopoles/vortices emerges smoothly from these
flat space configurations. We discuss interpretation of the upper
branche
configuration as a composite system consisting of BartnikMcKinnon
solution of EYM theory and an outer multimonopole/vortex solution of the
EYMH theory.
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