• Tuesday 21 May 2013 at 10.15 in A315: Simon Caron-Huot (NBI, CPH)
  When does the gluon reggeize
  Abstract: 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 pole behavior)?
  
  
• Thursday 23 May 2013 at 10.15 in A315: Daniel Litim (Sussex)
  Pulling oneself over the fence: a bootstrap for quantum gravity
  Abstract: 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 lattice QCD
  Abstract: 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)
  TBA
  Abstract: TBA
  
  
• Tuesday 4 June 2013 at 10.15 in A315: Georg Bergner (Frankfurt)
  Supersymmetry on the lattice and simulations of N=1 supersymmetric Yang-Mills theory
  Abstract: 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!
  Niskanen's cat
  
  
• Tuesday 6 August 2013 at 10.15 in A315: Jacob Bekenstein (Jerusalem)
  Black hole thermodynamics - then and now
  Abstract: 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
  Abstract: Lately, lattice field theory has been used to extensively study technicolor models, a class of candidate models for beyond the Standard Model dynamics. These 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. So far, the most common method for studying the running coupling on the lattice has been the Schrödinger Functional method. I present a study using a novel, Gradient Flow coupling measurement and compare it to the Schrödinger Functional in one 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 source for this year, earlier talks are just commented out).

Hopefully the up to 50 min + 10 min discussion long seminar/colloquium 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]