DEPARTMENT OF PHYSICS / HIP
JOINT COLLOQUIA / SEMINARS
HIP seminar room
Tuesday 21 May 2013 at 10.15 in A315:
Simon Caron-Huot (NBI, CPH)
When does the gluon reggeize
I will discuss a novel class of Wilson line operators that are supported on
a natural 'completion' of light cones.
By a simple conformal transformation, these operators are shown to govern
the high-energy limit of scattering amplitudes (Regge limit), in any CFT or
near-CFT such as QCD in the ultraviolet, and their anomalous dimension is
the BFKL kernel.
In the talk I'll use these operators to answer some basic questions
regarding the structure of the Regge limit -- for example, when do
gluon-exchange amplitudes exhibit pure power-law energy dependence (Regge
Thursday 23 May 2013 at 10.15 in A315:
Daniel Litim (Sussex)
Pulling oneself over the fence: a bootstrap for quantum gravity
Asymptotic freedom is a key ingredient in the successful construction of
the Standard Model. It has been conjectured long ago that metric quantum
gravity may as well fit into the picture - despite its notorious
perturbative non-renormalisability - provided that the theory turns out to
be asymptotically safe. We recall the underlying ideas and challenges, and
contrast asymptotic freedom with asymptotic safety. We also propose a
self-consistent search strategy for the latter and show new results for a
simplified version of quantum gravity. Implications for the asymptotic
safety conjecture are discussed.
Tuesday 28 May 2013 at 10.15 in A315:
Mario Schröck (Graz)
The effects of Dirac low-mode truncation on the hadron mass spectrum in
Chiral symmetry breaking in Quantum Chromodynamics is associated with the
low lying spectral modes of the Dirac operator according to the Banks-Casher
relation. We investigate how removal of a variable number of low lying modes
from the valence quark sector affects the masses of the ground states and
first excited states of baryons and mesons in two flavor lattice QCD.
Wednesday 29 May 2013 at 10.15 in A315 (Note day!):
Owe Philipsen (Frankfurt)
Tuesday 4 June 2013 at 10.15 in A315:
Georg Bergner (Frankfurt)
Supersymmetry on the lattice and simulations of N=1 supersymmetric
The numerical simulation of supersymmetric theories on the lattice is
still challenging subject of recent investigations. I will provide a
short summary of approaches towards a general solution for the
realization of supersymmetry on the lattice. In N=1 supersymmetric
Yang-Mills theory, the gauge part of supersymmetric extensions of the
standard model, supersymmetry can be restored in the continuum limit
according to theoretical predictions. However, there are technical
challenges for the simulations and the measurements of the states in
this model. In this talk I will provide a status report on the current
results concerning the mass spectrum of this theory.
Monday 10 June 2013 at 14.15 in A315:
Jouni Niskanen (Helsinki) Special seminar!
Tuesday 6 August 2013 at 10.15 in A315:
Jacob Bekenstein (Jerusalem)
Black hole thermodynamics - then and now
Black hole thermodynamics was developed about 40 years ago in the wake of
deepening the understanding of the black hole phenomenon. It has remained
lively by ramifying into a few subjects which are active fields of research
today. I will describe, from a personal point of view, how the subject started
and show how it connects to some contemporary issues in theoretical physics.
Tuesday 13 August 2013 at 10.15 in A315:
Jarno Rantaharju (Riken AICS, Kobe, Japan)
The Gradient Flow Coupling in Technicolor Models
Lately, lattice field theory has been used to extensively study technicolor
models, a class of candidate models for beyond the Standard Model dynamics.
models should lie close to the lower limit of the conformal window, where the
running coupling acquires a nonzero asymptotic value at small energy scales.
far, the most common method for studying the running coupling on the lattice
been the Schrödinger Functional method. I present a study using a novel,
Flow coupling measurement and compare it to the Schrödinger Functional
prominent technicolor candidate model, the SU(2) gauge theory coupled to 2
fermions in its adjoint representation.
Seminars in 2007 ,
in 2008 ,
in 2009 ,
in 2010 ,
in 2011 ,
in 2012 ,
earlier in 2013 (or view page
this year, earlier talks are just commented out).
Hopefully the up to 50 min + 10 min discussion long
will be understandable to a wide audience.
Contacts: Keijo Kajantie (keijo kajantie at helsinki fi) [department / HIP seminar],
Shaun Hotchkiss (shaun dot hotchkiss at helsinki dot fi) [cosmo seminar]
HIP Home Page
Department of Physics Home Page
Other related seminars
Friday 10-12 seminar series in D117:
and Workshop series
Wed 14-16 in Exactum C123.