Jack Laiho
(University of Glasgow)
23/07/2018, 14:00
Applications Beyond QCD
We present a study of the relative lattice spacing of different ensembles in the Euclidean dynamical triangulations approach to quantum gravity. We study the quantum fluctuations of the semiclassical backgrounds about de Sitter space following a similar analysis in causal dynamical triangulations and show how this can be used to determine the relative lattice spacing in our analysis. The...
Mr
Scott Bassler
(Syracuse University)
23/07/2018, 14:20
Applications Beyond QCD
We study the curvature-curvature correlator for quantum gravity in the case of degenerate Euclidean Dynamical Triangulations, drawing on recent insights to modify the procedure for calculating connected correlation functions to reduce finite size effects. We find asymptotically a positive norm state, and a decay consistent with a power law, but cannot yet resolve what this power is in the...
Mr
Raghav Govind Jha
(Syracuse University)
23/07/2018, 14:40
Applications Beyond QCD
We consider the lattice gravity model based on Euclidean dynamical triangulations incorporating degenerate tiling with a non-trivial measure term and couple it minimally to a scalar field in the quenched approximation. Our preliminary results suggest a multiplicative renormalization for the mass of the scalar field which is consistent with the shift symmetry of the discretized lattice action....
Mr
Adrien Florio
(EPFL)
23/07/2018, 15:00
Applications Beyond QCD
Non-abelian gauge theories have a complex vacuum structure which has well-known dynamical consequences. The prototypical example is given by $SU(2)$ sphalerons and their potential role in baryogenesis. Transitions between topologically inequivalent vacua can produce some irreversible net amount of chiral charge.
At a first glance, it does not seem that similar effects may be obtained with...
Mr
Kohta Hatakeyama
(Shizuoka University)
23/07/2018, 15:20
Applications Beyond QCD
We study renormalization on the fuzzy sphere. We perform Monte Carlo simulation of a scalar field theory on the fuzzy sphere, which is described by a Hermitian matrix model. We show that correlation functions defined by using the Berezin symbol are made independent of the matrix size, which plays a role of a UV cutoff, by tuning a parameter of the theory. We also find that the theories on the...