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 Abou-Zeid (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 super-Yang-Mills 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
Garcia-Perez (Madrid)
|
Non-perturbative 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 Calabi-Yau 3-folds |
February
|
11 |
Fernando Alday (Utrecht U.) |
Scattering Amplitudes and AdS/CFT |
February |
18 |
Alexander
Quintero Velez
(Utrecht
U.)
|
McKay
correspondence for Landau-Ginzburg 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 Yang-Mills 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 non-linear 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
non-trivial 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 set-up 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 KKLT-O'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
E-mail: 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 (Albert-Einstein Institute, Potsdam) |
Large Spin Twist Operators, Gluon Amplitudes, and AdS/CFT |
October |
30 |
bank holiday |
|
November |
6 |
Stefano Kovacs (Trinity College Dublin) |
Ultra-violet finiteness of planar beta-deformed Yang-Mills |
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 M-theory
|
November |
27 |
Gleb Arutyunov (Utrecht) |
The off-shell
symmetry algebra of the light-cone AdS_5 x S^5 superstring |
December |
4 |
Yasha Shnir (Institute of Physics, Oldenburg) |
Monopole-antimonopole chains and closed vortices in Yang-Mills-Higgs and Einstein-Yang-Mills-Higgs 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 non-commutative Calabi-Yau 3-folds |
January |
22 |
Arkady Tseytlin (Imperial College) |
Sigma model RG flow and Perelman's entropy |
January |
29 |
Neil Lambert |
The
M-theory 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 M-theory duals |
April |
9 |
holiday |
|
April |
16 |
Lionel Mason |
From twistor-strings 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 Yang-Mills Instantons on
Asymptotically Locally Flat Gravitational Instantons. To
illustrate
the construction we explicitly compute the metric on the moduli space
of one instanton on Taub-NUT 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 Seiberg-Witten 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 non-perturbative
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 twistor-strings to quantum gravity
O Colgain, Eoin (Imperial
College)
4d CFTS with M-theory 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
Calabi--Yau manifolds and even transitions to non-geometric models such
as
Landau--Ginzburg orbifold. In this talk we will consider B-type D-branes
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 M-theory Geometry of Fermionic
Open String Modes
We will discuss the lift to M-theory of a D4-D6 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
M5-brane 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 S-matrix in the light-cone gauge and discuss the realization
of
the global symmetries on asymptotic states. A mild non-locality of the
supercharges results in the natural appearance of a non-trivial
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 all-loop asymptotic S-matrix that enters the Bethe
equations for gauge theory anomalous dimensions and we will show that
they
are in good agreement. This S-matrix 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 non-commutative crepant resolutions of toric 3-fold Gorenstein
singularities. This is an introductory talk which will discuss what
these
terms mean and why the expectation is reasonable.
/////////////////////////////////////////////////////////
Matthias Staudacher
Albert-Einstein 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
Ultra-violet finiteness of planar
beta-deformed Yang-Mills
usually referred to as beta-deformed N=4 super Yang-Mills, has only
N=1 supersymmetry and a U(1)xU(1) flavour symmetry. I will show that
the introduction of a suitably defined superspace star-product allows
to formulate the theory in N=4 light-cone 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
ultra-violet 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 non--perturbative 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 M-theory".
The study of Feynman diagrams of eleven-dimensional supergravity leads
to
detailed statements concerning non-perturbative features of the low
energy
limit of string theory in lower dimensions. Together with certain
well-established 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 off-shell symmetry algebra of the light-cone AdS_5 x S^5 superstring
We analyze the psu(2,2|4) supersymmetry algebra of a
superstring propagating
in the AdS_5 x S^5 background in the uniform light-cone gauge.
We consider the off-shell theory by relaxing the level-matching
condition
and take the limit of infinite light-cone momentum, which
decompactifies the
string world-sheet.
We focus on the psu(2|2)+psu(2|2) subalgebra which leaves the light-cone
Hamiltonian invariant and show that it undergoes extension by a central
element which is expressed in terms of the level-matching operator.
This result is in agreement with the conjectured symmetry algebra of the
dynamic S-matrix in the dual N=4 gauge theory
Yasha Shnir (Institute
of Physics, Oldenburg)
Monopole-antimonopole chains and
closed vortices in Yang-Mills-Higgs and
Einstein-Yang-Mills-Higgs theory.
We discuss properties of the axially symmetric static saddle point
solutions of SU(2) Yang-Mills-Higgs 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 Bartnik-McKinnon
solution of EYM theory and an outer multimonopole/vortex solution of the
EYMH theory.
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