Quantum Fields – from Fundamental Concepts to Phenomenological Questions

Session

Characterizing Quantum Spacetime

Sep 26, 2018, 11:00 AM

02.430 (Mainz Institute for Theoretical Physics, Johannes Gutenberg University)

38. Anti-Newtonian Expansions and the Functional Renormalization Group

Dr Max Niedermaier (Department of Physics and Astronomy, University of Pittsburgh)

9/26/18, 11:00 AM

In QFT an Anti-Newtonian expansion perturbs around decoupled copies of a self-interacting quantum mechanical system, with subsequent coupling induced by spatial hopping terms. Such an expansion is developed for the effective action of 1+d dimensional scalar QFTs. A Functional Renormalization Group in the hopping parameter leads to a recursion for which an exact solution in terms of...

39. The problem of vacuum in quantum gravity: a view from Asymptotic Safety

Dr Alfio Maurizio Bonanno (INAF Catania - INFN)

9/26/18, 11:45 AM

We use the non-Gaussian fixed points (NGFPs) appearing in the renormalization group flow of gravity and gravity-matter systems to construct models of NGFP-driven inflation via a renormalization group improvement scheme. The cosmological predictions of these models depend sensitively on the characteristic properties of the NGFPs, including their position and stability coefficients, which in...

25. Quantum gravity and the search for observables

Prof. Renate Loll

9/27/18, 9:00 AM

26. Geometric operators in Asymptotic Safety

Dr Carlo Pagani

9/27/18, 9:45 AM

We consider the scaling properties of geometric operators such as parametrized curves, surfaces, and volumes in the context of the Asymptotic Safety scenario for Quantum Gravity. We also discuss the scaling properties of geodesics and their possible role in the Asymptotic Safety scenario.

28. Is Lorentz symmetry relevant?

Dr Benjamin Knorr (Radboud University)

9/27/18, 11:00 AM

Among the several approaches to quantise gravity, one particular is Horava-Lifshitz gravity, claiming that Lorentz symmetry is broken microscopically, which might allow a perturbative renormalisation of gravity. For this scenario to be related to the real world, Lorentz symmetry must be restored on large scales to be consistent with countless experiments. I propose a new foliated...

29. Towards a predictive ultraviolet completion for quantum gravity and the Standard Model

Dr Astrid Eichhorn

9/27/18, 11:45 AM

I will discuss recent progress towards an ultraviolet completion of the Standard Model induced by asymptotically safe quantum fluctuations of gravity. In particular, I will focus on a scenario to retrodict the top and bottom mass and the Abelian gauge coupling from asymptotic safety. In an approximation, antiscreening quantum-gravity fluctuations induce an asymptotically safe fixed point for...