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10 papers · 2 filters
Wave maps on a wormhole
Piotr Bizoń, Michał Kahl
We consider equivariant wave maps from a wormhole spacetime into the three-sphere. This toy-model is designed for gaining insight into the dissipation-by-dispersion phenomena, in p…
A c=1 phase transition in two-dimensional CDT/Horava-Lifshitz gravity?
Jan Ambjørn, Andrzej Görlich, Jerzy Jurkiewicz +1
We study matter with central charge coupled to two-dimensional (2d) quantum gravity, here represented as causal dynamical triangulations (CDT). 2d CDT is known to provide a…
The spectral dimension in 2D CDT gravity coupled to scalar fields
Jan Ambjørn, Andrzej Görlich, Jerzy Jurkiewicz +1
Causal Dynamical Triangulations (CDT) provide a non-perturbative formulation of Quantum Gravity assuming the existence of a global time foliation. In our earlier study we analyzed…
Comment on "Holographic Thermalization, stability of AdS, and the Fermi-Pasta-Ulam-Tsingou paradox" by V. Balasubramanian et al
Piotr Bizoń, Andrzej Rostworowski
We comment upon a numerical computation in a recent paper by Balasubramanian, Buchel, Green, Lehner, and Liebling.
General-relativistic versus Newtonian: geometric dragging and dynamic anti-dragging in stationary disks in the first post-Newtonian approximation
Piotr Jaranowski, Patryk Mach, Edward Malec +1
We evaluate general-relativistic effects in motion of stationary accretion disks around a Schwarzschild black hole, assuming the first post-Newtonian (1PN) approximation. There ari…
The local and global geometrical aspects of the twin paradox in static spacetimes: II. Reissner--Nordström and ultrastatic metrics
Leszek M. Sokołowski, Zdzisław A. Golda
This is a consecutive paper on the timelike geodesic structure of static spherically symmetric spacetimes. First we show that for a stable circular orbit (if it exists) in any of t…