We use hydrodynamical separate universe simulations with the IllustrisTNG model to predict
the local primordial non-Gaussianity (PNG) bias parameters b ϕ and b ϕδ, which enter at …

We study the cosmological sector of the Lorentzian Barrett-Crane (BC) model coupled to a
free massless scalar field in its Group Field Theory (GFT) formulation, corresponding to the …

Spin foams provide a framework for the dynamics of loop quantum gravity that is manifestly
covariant under the full four-dimensional diffeomorphism symmetry group of general …

We argue that refining, coarse graining and entangling operators can be obtained from time
evolution operators. This applies in particular to geometric theories, such as spin foams. We …

We study the asymptotic behaviour of the vertex amplitude for the EPRL spin foam model
extended to include timelike tetrahedra. We analyze both, tetrahedra of …

The 4D Regge action is invariant under 5–1 and 4–2 Pachner moves, which define a subset
of (local) changes of the triangulation. Given this fact, one might hope to find a local path …

The universal coupling of matter and gravity is one of the most important features of general
relativity. In quantum gravity, in particular spin foams, matter couplings have been defined in …

Driven by the ambition and the fundamental need to reconcile quantum theory with general
relativity, research in quantum gravity has grown steadily over the decades, with several …

We fill one of the remaining gaps in the asymptotic analysis of the vertex amplitudes of the
Engle–Pereira–Rovelli–Livine (EPRL) spin foam models: We show that the Hessian is …

The continuum limit of loop quantum gravity is still an open problem. Indeed, no proper
dynamics in known to start with and we still lack the mathematical tools to study its would-be …