523 citations · 4k across the 60 of their papers we have counts for
5 papers · 1 filter
On the relation between Euclidean and Lorentzian 2D quantum gravity
J. Ambjorn, J. Correia, C. Kristjansen +1
Starting from 2D Euclidean quantum gravity, we show that one recovers 2D Lorentzian quantum gravity by removing all baby universes. Using a peeling procedure to decompose the discr…
Making the gravitational path integral more Lorentzian, or: Life beyond Liouville gravity
R. Loll, J. Ambjorn, K. N. Anagnostopoulos
In two space-time dimensions, there is a theory of Lorentzian quantum gravity which can be defined by a rigorous, non-perturbative path integral and is inequivalent to the well-kno…
Crossing the c=1 barrier in 2d Lorentzian quantum gravity
J. Ambjorn, K. N. Anagnostopoulos, R. Loll
In an extension of earlier work we investigate the behaviour of two-dimensional Lorentzian quantum gravity under coupling to a conformal field theory with c>1. This is done by anal…
Abelian gauge fields coupled to simplicial quantum gravity
J. Ambjorn, K. N. Anagnostopoulos, J. Jurkiewicz
We study the coupling of Abelian gauge theories to four-dimensional simplicial quantum gravity. The gauge fields live on dual links. This is the correct formulation if we want to c…
Vortex Structure vs. Monopole Dominance in Abelian-Projected Gauge Theory
J. Ambjorn, J. Giedt, J. Greensite
We find that Polyakov lines, computed in abelian-projected SU(2) lattice gauge theory in the confined phase, have finite expectation values for lines corresponding to two units of…