13 research outputs found
Topology Changing Process of Coalescing Black Holes on Eguchi-Hanson Space
We numerically study the event horizons of two kinds of five-dimensional
coalescing black hole solutions with different asymptotic structures: the
five-dimensional Kastor-Traschen solution (5DKT) and the coalescing black hole
solution on Eguchi-Hanson space (CBEH). Topologies of the spatial infinity are
and , respectively. We show that
the crease sets of event horizons are topologically in 5DKT and
in CBEH, respectively. If we choose the time slices
which respect space-time symmetry, the first contact points of the coalescing
process is a point in the 5DKT case but a in the CBEH case. We also
find that in CBEH, time slices can be chosen so that a black ring with topology can be also formed during a certain intermediate
period unlike the 5DKT.Comment: 13 pages, 17 figure
Chaotic motion in multi-black hole spacetimes and holographic screens
We investigate the geodesic motion in dimensional Majumdar-Papapetrou
multi-black hole spacetimes and find that the qualitative features of the D=4
case are shared by the higher dimensional configurations. The motion of
timelike and null particles is chaotic, the phase space being divided into
basins of attraction which are separated by a fractal boundary, with a fractal
dimension . The mapping of the geodesic trajectories on a screen placed in
the asymptotic region is also investigated. We find that the fractal properties
of the phase space induces a fractal structure on the holographic screen, with
a fractal dimension .Comment: 8 pages, 5 figure
Hot Halos and Galactic Glasses
We initiate a systematic study of the state space of non-extremal, stationary
black hole bound states in four-dimensional N = 2 supergravity. Specifically,
we show that an exponential multitude of classically stable "halo" bound states
can be formed between large finite temperature D4-D0 black hole cores and much
smaller, arbitrarily charged black holes at the same temperature. We map out in
full the regions of existence for thermodynamically stable and metastable bound
states in terms of the core's charges and temperature, as well as the region of
stability of the core itself. Several features of these systems, such as a
macroscopic configurational entropy and exponential relaxation timescales, are
similar to those of the extended family of glasses. We draw parallels between
the two with a view toward understanding complex systems in fundamental
physics.Comment: 29 pages, 5 figures, v2: typos corrected, references adde