386 citations · 5.6k across the 175 of their papers we have counts for
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Planckian Birth of the Quantum de Sitter Universe
J. Ambjorn, A. Gorlich, J. Jurkiewicz +1
We show that the quantum universe emerging from a nonperturbative, Lorentzian sum-over-geometries can be described with high accuracy by a four-dimensional de Sitter spacetime. By…
ZZ branes from a worldsheet perspective
Jan Ambjorn, Jens Anders Gesser
We show how non-compact space-time (ZZ branes) emerges as a limit of compact space-time (FZZT branes) for specific ratios between the square of the boundary cosmological constant a…
The nature of ZZ branes
J. Ambjorn, J. A. Gesser
In minimal non-critical string theory we show that the principal (r,s) ZZ brane can be viewed as the basic (1,1) ZZ boundary state tensored with the (r,s) Cardy boundary state. In…
World-sheet dynamics of ZZ branes
Jan Ambjorn, Jens A. Gesser
We show how non-compact space-time (ZZ branes) emerges as a limit of compact space-time (FZZT branes) for specific ratios between the square of the boundary cosmological constant a…
Wilson Loops in 2D Noncommutative Euclidean Gauge Theory: 2. 1/θExpansion
Jan Ambjorn, Andrei Dubin, Yuri Makeenko
We analyze the and 1/N expansions of the Wilson loop averages in the two-dimensional noncommutative gauge theory with the parameter of noncommutati…