SciPost Phys. 8, 071 (2020) ·
published 1 May 2020
|
· pdf
A continuum formulation of gauge-fixing resolving the Gribov-Singer ambiguity
remains a challenge. Finding a Lagrangian formulation of operational
resolutions in numerical lattice calculations, like minimal Landau gauge, would
be one possibility. Such a formulation will here be constrained by
reconstructing the Dyson-Schwinger equation for which the lattice
minimal-Landau-gauge ghost propagator is a solution. It is found that this
requires an additional term. As a by-product new, high precision lattice
results for the ghost-gluon vertex in three and four dimensions are obtained.
SciPost Phys. 8, 051 (2020) ·
published 6 April 2020
|
· pdf
Taking manifest invariance under both gauge symmetry and diffeomorphisms as a
guiding principle physical objects are constructed for Yang-Mills-Higgs theory
coupled to quantum gravity. These objects are entirely classified by quantum
numbers defined in the tangent space. Applying the Fr\"ohlich-Morchio-Strocchi
mechanism to these objects reveals that they coincide with ordinary correlation
functions in quantum-field theory, if quantum fluctuations of gravity and
curvature become small. Taking these descriptions literally exhibits how
quantum gravity fields need to dress quantum fields to create physical objects,
i.e. giving a graviton component to ordinary observed particles. The same
mechanism provides access to the physical spectrum of pure gravitational
degrees of freedom.
Prof. Maas: "Dear referee, thank you for..."
in Report on The Fröhlich-Morchio-Strocchi mechanism and quantum gravity