386 citations · 5.6k across the 175 of their papers we have counts for
9 papers · 1 filter
String Theory in Electromagnetic Fields
J. Ambjorn, Y. M. Makeenko, G. W. Semenoff +1
A review of various aspects of superstrings in background electromagnetic fields is presented. Topics covered include the Born-Infeld action, spectrum of open strings in background…
Computer Simulations of 3d Lorentzian Quantum Gravity
J. Ambjorn, J. Jurkiewicz, R. Loll
We investigate the phase diagram of non-perturbative three-dimensional Lorentzian quantum gravity with the help of Monte Carlo simulations. The system has a first-order phase trans…
Simulating Simplified Versions of the IKKT Matrix Model
J. Ambjorn, K. N. Anagnostopoulos, W. Bietenholz +2
We simulate a supersymmetric matrix model obtained from dimensional reduction of 4d SU(N) super Yang-Mills theory (a 4d counter part of the IKKT model or IIB matrix model). The eig…
Integrable Ladder t-J Model with Staggered Shift of the Spectral Parameter
J. Ambjorn, D. Arnaudon, A. Sedrakyan +2
The generalization of the Yang-Baxter equations (YBE) in the presence of Z_2 grading along both chain and time directions is presented and an integrable model of t-J type with stag…
Monte Carlo Studies of the IIB Matrix Model at Large N
J. Ambjorn, K. N. Anagnostopoulos, W. Bietenholz +2
The low-energy effective theory of the IIB matrix model developed by H. Aoki et al. is written down explicitly in terms of bosonic variables only. The effective theory is then stud…
Lattice Gauge Fields and Discrete Noncommutative Yang-Mills Theory
J. Ambjorn, Y. M. Makeenko, J. Nishimura +1
We present a lattice formulation of noncommutative Yang-Mills theory in arbitrary even dimensionality. The UV/IR mixing characteristic of noncommutative field theories is demonstra…
Large N Dynamics of Dimensionally Reduced 4D SU(N) Super Yang-Mills Theory
J. Ambjorn, K. N. Anagnostopoulos, W. Bietenholz +2
We perform Monte Carlo simulations of a supersymmetric matrix model, which is obtained by dimensional reduction of 4D SU(N) super Yang-Mills theory. The model can be considered as…
Nonperturbative Dynamics of Noncommutative Gauge Theory
J. Ambjorn, Y. M. Makeenko, J. Nishimura +1
We present a nonperturbative lattice formulation of noncommutative Yang-Mills theories in arbitrary even dimension. We show that lattice regularization of a noncommutative field th…
Lorentzian and Euclidean Quantum Gravity - Analytical and Numerical Results
J. Ambjorn, J. Jurkiewicz, R. Loll
We review some recent attempts to extract information about the nature of quantum gravity, with and without matter, by quantum field theoretical methods. More specifically, we work…