Sunday, December 10, 2017
Klaus Liegner
"Hamiltonian Renormalisation"
We study the question whether it is possible to reformulate the Wilsonian renormalisation group non-perturbatively directly at the operator (Hamiltonian) level. Hamiltonian renormalisation would be the natural route to follow if one had easier access to an interacting Hamiltonian operator rather than to a path integral, at least in the presence of UV and/or IR cut-off, which is generically the case in complicated gauge theories such as General Relativity. Our guiding principle for the definition of the direct Hamiltonian renormalisation group is that it results in the same continuum theory as the covariant (path integral) renormalisation group. We will investigate this direct Hamiltonian Renormalisation for the case of the free massive quantum scalar field and point out its necessity in a concrete cosmological example for Quantum Gravity.
Tuesday, December 5, 2017
Visit by Andrzej Krolak
Prof. Krolak from Institute of Mathematics, Polish Academy of Sciences at Warsaw is visiting us from Nov 27-Dec 6, 2017. Prof. Krolak has made very seminal contributions to our understanding of strength of singularities, and various aspects of theoretical gravity and gravitational waves. He is the head of the Polish gravitatioanal wave community involved with Virgo gravitational wave detector.
You are welcome to discuss with Andrzej in room 255.
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