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7 papers · 2 filters
Fractal Space-Time from Spin-Foams
Elena Magliaro, Claudio Perini, Leonardo Modesto
In this paper we perform the calculation of the spectral dimension of spacetime in 4d quantum gravity using the Barrett-Crane (BC) spinfoam model. We realize this considering a ver…
A geometric perspective on singularity resolution and uniqueness in loop quantum cosmology
Alejandro Corichi, Parampreet Singh
We re-examine the issue of singularity resolution in homogeneous loop quantum cosmology from the perspective of geometrical entities such as expansion rate and the shear scalar. Th…
Emergence of spatial structure from causal sets
David Rideout, Petros Wallden
There are numerous indications that a discrete substratum underlies continuum spacetime. Any fundamentally discrete approach to quantum gravity must provide some prescription for h…
Spherically symmetric black holes in minimally modified self-dual gravity
Akihiro Ishibashi, Simone Speziale
We discuss spherically symmetric black holes in the modified self-dual theory of gravity recently studied by Krasnov, obtained adding a Weyl-curvature dependent `cosmological term'…
Stable Homology as an Indicator of Manifoldlikeness in Causal Set Theory
Seth Major, David Rideout, Sumati Surya
We present a computational tool that can be used to obtain the "spatial" homology groups of a causal set. Localisation in the causal set is seeded by an inextendible antichain, whi…
Transcending Big Bang in Loop Quantum Cosmology: Recent Advances
Parampreet Singh
We discuss the way non-perturbative quantization of cosmological spacetimes in loop quantum cosmology provides insights on the physics of Planck scale and the resolution of big ban…