386 citations · 5.6k across the 175 of their papers we have counts for
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The Quantum Spacetime of c>0 2d Gravity
J. Ambjorn, K. N. Anagnostopoulos, G. Thorleifsson
We review recent developments in the understanding of the fractal properties of quantum spacetime of 2d gravity coupled to c>0 conformal matter. In particular we discuss bounds put…
Complex zeros of the 2d Ising model on dynamical random lattices
J. Ambjørn, K. N. Anagnostopoulos, U. Magnea
We study the zeros in the complex plane of the partition function for the Ising model coupled to quantum gravity for complex magnetic field and for complex temperature. We com…
U(1) lattice gauge theory and N=2 supersymmetric Yang-Mills theory
Jan Ambjorn, Domenec Espriu, Naoki Sasakura
We discuss the physics of four-dimensional compact U(1) lattice gauge theory from the point of view of softly broken N=2 supersymmetric SU(2) Yang-Mills theory. We provide argument…
Improved determination of the classical sphaleron transition rate
J. Ambjorn, A. Krasnitz
We determine the sphaleron transition rate using real time lattice simulations of the classical system. An improved definition of the lattice topological charge allows us to obtain…
Singularities of the Partition Function for the Ising Model Coupled to 2d Quantum Gravity
J. Ambjorn, K. N. Anagnostopoulos, U. Magnea
We study the zeros in the complex plane of the partition function for the Ising model coupled to 2d quantum gravity for complex magnetic field and real temperature, and for complex…
Spikes in Quantum Regge Calculus
J. Ambjorn, J. Nielsen, J. Rolf +1
We demonstrate by explicit calculation of the DeWitt-like measure in two-dimensional quantum Regge gravity that it is highly non-local and that the average values of link lengths $…
On the Connection Between 2d Topological Gravity and the Reduced Hermitian Matrix Model
J. Ambjorn, M. G. Harris, M. Weis
We discuss how concepts such as geodesic length and the volume of space-time can appear in 2d topological gravity. We then construct a detailed mapping between the reduced Hermitia…
A New Family of Integrable Extended Multi-band Hubbard Hamiltonians
J. Ambjorn, A. Avakyan, T. Hakobyan +1
We consider exactly solvable 1d multi-band fermionic Hamiltonians, which have affine quantum group symmetry for all values of the deformation. The simplest Hamiltonian is a multi-b…