Leopold Infeld Colloquium
2006/2007 | 2007/2008 | 2008/2009 | 2009/2010 | 2010/2011 | 2011/2012 | 2012/2013 | 2013/2014 | 2014/2015 | 2015/2016 | 2016/2017 | 2017/2018
2015-03-12 (Thursday)
room 0.06, Pasteura 5 at 15:30 
Professor Neil Lambert (King's College London)M-Theory and Hidden Spacetime in Quantum Field Theory
M-Theory arises as non-perturbative formulation of string theory and as such may be viewed as a complete quantum theory of particle physics, unified with gravity. However in this talk we will discuss predictions M-theory makes about the non-perturbative behaviour of quantum field theory. In particular we will discuss examples where there is a hidden extra dimension that opens up at strong coupling.
2015-02-26 (Thursday)
room 0.06, Pasteura 5 at 15:30
Dr Krzysztof Turzyński (Instytut Fizyki Teoretycznej Wydziału Fizyki UW)Power spectrum of curvature perturbations in multi-field models of inflation
The inflationary paradigm is most simply realized by a model with a single, slowly rolling scalar field. As the cosmological data constraining inflation become more and more accurate, it is important to consider how this benchmark model is located in a theory space of more complicated models. To this end, I will present a few not-too-complicated examples of multi-field inflationary scenarios in which the relations between the observations and the model parameters can be quite different than in the simplest case.
2014-12-18 (Thursday)
room 0.06, Pasteura 5 at 15:30
Prof. dr hab. Iwo Białynicki-Birula (CFT PAN)Quantum fluctuations of geometry in hot Universe
The fluctuations of spacetime geometries at finite temperature are evaluated within the linearized theory of gravity. These fluctuations will be described by the probability distribution of various configurations of the gravitational field. The gravitational field configurations are described by the linearized Riemann-Weyl tensor. The probability distribution has a foam-like structure, as intuitively argued by Wheeler. Prevailing configurations are those with the large changes of geometry at nearby points. Striking differences are found between the fluctuations of the electromagnetic field and the gravitational field