Thursday,
29 September 2005
Time-space
noncommutative solitons
O.
Lechtenfeld
(Univ. Hannover,
Germany)
Tuesday
12, July 2005, at 10:30am
D-branes in CFT
backgrounds
S.
Fredenhagen
(ETH, Zurich,
Switzerland)
Tuesday 12, July 2005, at 11:05am
Correlations in the
2D Ising model on a finite lattice
O.
Lisovyy
(Angers University,
France)
Tuesday 12, July 2005, at 11:40am
General p-form
gauge theories: physics and mathematics
T.
Strobl
(Jena University,
Germany)
Thursday,
7 July 2005
Quest for an
alternate QED: The Born legacy
M. K.
H. Kiessling
(Rutgers University,
Piscataway, USA)
Abstract:
In 1933, Max Born suggested that the ultraviolet problems of (early)
QED can be avoided by quantizing a self-regularizing, nonlinear
classical field theory of electromagnetism. Recently his and Infelds
field equations resurfaced in superstring theory, and while most works
on it since have focused on higher-dimensional and non-commutative
versions of these equations, this activity has also rekindled some
interest in the original ideas. In my talk, I will survey the
4-dimensional electromagnetic theory from its beginnings to where we
stand today.
Tuesday, 21 June 2005, at
3.00 p.m.
Brane worlds and
the strong CP problem
M.
Shaposhnikov
(EPFL, Lausanne,
Switzerland)
Abstract:
One of the puzzles in particle physics is the conservation of CP
symmetry in strong interactions. After reviewing the strong CP problem
I will discuss whether recent proposals of brane worlds and extra
dimensions can provide its solution.
Thursday,
19 May 2005
Higgs scalars in
gauge-Higgs unification
K.
Takenaga
(Osaka University,
Japan)
Abstract:
The gauge-Higgs (GH) unification theory identifies the zero mode of the
extra dimensional component of the gauge field as the usual Higgs
doublet. Since this degree of freedom is the Wilson line phase, the
Higgs does not have the mass term nor quartic coupling at the tree
level. Through quantum corrections, the Higgs can take a vacuum
expectation value, and its mass is induced. The radiatively induced
mass tends to be small, although it can be lifted to O(100) GeV by
introducing the O(10) numbers of bulk fields. Perturbation theory
becomes unreliable when a large number of bulk fields are introduced.
We analyze the Higgs mass based on useful expansion formulae for the
effective potential and find that even a small number of bulk field can
have the suitable heavy Higgs mass. We show that a small (large) number
of bulk fields are enough (needed) when the SUSY breaking mass is large
(small). We also study the case of introducing the soft SUSY breaking
scalar masses in addition to the Scherk-Schwarz SUSY breaking and
obtain the heavy Higgs mass due to the effect of the scalar mass. If I
have time, I would also like to talk about the related physics of GH
unification and the LHC.
Monday,
16 May 2005, at 2.30 p.m.
Topics in
theoretical biology
C.
G. Callan Jr.
(Princeton
University, USA)
Abstract:
On the occasion of being conferred an
Honorary Doctorate by the NUIM on 17 May, Professor C.G. Callan visited
the School of Theoretical Physics on
the afternoon of 16 May, between 2.00 p.m. and 4.30 p.m., and met with
theorists in the Dublin Area.
Thursday,
21 April 2005
Instantons in N=2
super Yang-Mills theory
R.
Poghossian
(Yerevan Physics Institute, Armenia)
Thursday,
14 April 2005
Regge behavior in
gauge/gravity duality
O.
Andreev
(Landau Institute for Theoretical Physics, Moscow, Russia)
Thursday,
7 April 2005
Noncommutative
instantons on noncommutative spheres
G.
Landi
(Università di
Trieste, Italy)
Abstract:
We construct noncommutative principal
fibrations which are deformations of the classical SU(2) Hopf fibration
over the four sphere, thus deforming spheres as well. We realize the
noncommutative vector bundles associated with irreducible
representations of SU(2) as modules of coequivariant maps and construct
corresponding projections. The index of Dirac operators with
coefficients in the associated bundles is computed with the
Connes-Moscovici local index formula.
Friday,
14 January 2005
Confinement problem
from the lattice point of view
M. I.
Polikarpov
(ITEP, Moscow, Russia)
Plan of the talk:
1. Abelian projection, monopoles and
confinement
2. Center vortices and confinement
3. 3D structures in 4D lattice gluodynamics
4. Aharonov-Bohm effect and confinement
Thursday,
13 January 2005
Numerical study of
QCD with dynamical fermions on the lattice
M. I.
Polikarpov
(ITEP, Moscow, Russia)
Plan of the talk:
1. QCD on the lattice (short
introduction)
2. Finite temperature phase transition
3. Profiles of the confining string
4. Structure of the baryonic flux tube
5. Profiles of the broken string
