7 papers
Machine learning in phase transition analysis of lattice quantum gravity
Jan Ambjorn, Zbigniew Drogosz, Jakub Gizbert-Studnicki +3
Using numerical data coming from Monte Carlo simulations of four-dimensional Causal Dynamical Triangulations, we study how automated machine learning algorithms can be used to reco…
Can a late-time cosmological model based on baby universe absorption explain the z-variation of w?
Jan Ambjorn, Yoshiyuki Watabiki
We point out that a simple late-time cosmological model where our Universe can absorb "baby universes" explains the exponential expansion of our universe without the need of a cosm…
Causal Dynamical Triangulations: New Lattice Theory of Quantum Gravity
J. Ambjørn, R. Loll
Causal Dynamical Triangulations (CDT) is a methodology to define and compute the gravitational path integral, whose aim is a fully fledged nonperturbative quantum field theory of g…
Branched polymers with loops coupled to the critical Ising model
Jan Ambjørn, Yukimura Izawa, Yuki Sato
We study the continuum limit of branched polymers (BPs) with loops coupled to Ising spins at the zero-temperature critical point. It is known that the continuum partition function…
The emergence of the universe
Jan Ambjorn, Yoshiyuki Watabiki
We show how our Universe can emerge from a symmetry breaking of a multicomponent algebra, where the components in addition form a Jordan algebra. We discuss how symmetry brea…
IR and UV limits of CDT and their relations to FRG
Jan Ambjorn, Jakub Gizbert-Studnicki, Andrzej Goerlich +1
Causal Dynamical Triangulations (CDT) is a lattice theory of quantum gravity. It is shown how to identify the IR and the UV limits of this lattice theory with similar limits studie…