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Dr Dario Benedetti28/09/2018, 09:00The large-N limit of quantum field theories with fields in the fundamental or adjoint representation of a compact Lie group, such as O(N) or U(N), has been extensively studied over the years as a tool for accessing non-perturbative physics by analytic means. Not much has been done instead until recent years for the large-N limit of theories in tensor product representations, or in the...Go to contribution page
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Dr Omar Zanusso28/09/2018, 09:45We discuss the low-energy gravitational effective action induced by quantum fluctuations of two- and four-dimensional massive matter fields. We show that the effective action agrees with expectations based on the Appelquist-Carazzone theorem and provide a renormalization group interpretation of the results which is rather scheme-independent in that it does not depend explicitly on a cutoff...Go to contribution page
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Prof. Bianca Dittrich28/09/2018, 11:00A quantum gravity theory should yield a prescription of how to assign quantum amplitudes to arbitrary boundary geometries. I will describe a renormalization program for background independent theories, where the coarseness of the boundary data is used to define a notion of scale and truncations for the renormalization flow. This allows to bootstrap the amplitudes from coarse to finer and finer...Go to contribution page
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Prof. Roberto Percacci28/09/2018, 11:45I will discuss various definitions of Wick rotation in a gravitational context and argue in favor of a definition where it is viewed as an analytic continuation of the metric. I will then show that also this definition has severe shortcomings. In particular, it may not always be possible to preserve the field Equations and the symmetries at global level.Go to contribution page
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