4,891 research outputs found
Orbital Dynamics of Binary Boson Star Systems
We extend our previous studies of head-on collisions of boson stars by
considering orbiting binary boson stars. We concentrate on equal mass binaries
and study the dynamical behavior of boson/boson and boson/antiboson pairs. We
examine the gravitational wave output of these binaries and compare with other
compact binaries. Such a comparison lets us probe the apparent simplicity
observed in gravitational waves produced by black hole binary systems. In our
system of interest however, there is an additional internal freedom which plays
a significant role in the system's dynamics, namely the phase of each star. Our
evolutions show rather simple behavior at early times, but large differences
occur at late times for the various initial configurations.Comment: 10 pages, 14 figure
Scalar Collapse in AdS
Recently, studies of the gravitational collapse of a scalar field within
spherically symmetric AdS spacetimes was presented in
\cite{Bizon:2011gg,Jalmuzna:2011qw} which showed an instability of pure AdS to
black hole formation. In particular, the work showed that arbitrarily small
initial configurations of scalar field evolved through some number of
reflections off the AdS boundary until a black hole forms. We consider this
same system, extended to include a complex scalar field, and reproduce this
phenomena. We present tests of our numerical code that demonstrate convergence
and consistency. We study the properties of the evolution as the scalar pulse
becomes more compact examining the asymptotic behavior of the scalar field, an
observable in the corresponding boundary CFT. We demonstrate that such BH
formation occurs even when one places a reflecting boundary at finite radius
indicating that the sharpening is a property of gravity in a bounded domain,
not of AdS itself. We examine how the initial energy is transferred to higher
frequencies --which leads to black hole formation-- and uncover interesting
features of this transfer.Comment: 34 pages, 11 figures; Revised to be more consistent with published
version: updated references, an added paragraph, and a subsection remove
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