Kavli Affiliate: Ulrich Sperhake
| First 5 Authors: Bo-Xuan Ge, Eugene A. Lim, Ulrich Sperhake, Tamara Evstafyeva, Daniela Cors
| Summary:
We explore the gravitational-wave emission from head-on collisions of
equal-mass solitonic boson-star binaries from simulations spanning a
two-dimensional parameter space, consisting of the central scalar-field
amplitude of the stars and the solitonic potential parameter. We report the
gravitational-wave energies emitted by boson-star binaries which, due to their
combination of moderately high compactness with significant deformability, we
often find to be louder by up to an order of magnitude than analogous
black-hole collisions. The dependence of the radiated energy on the boson-star
parameters exhibits striking needle-sharp features and discontinuous jumps to
the value emitted by black-hole binaries. We explain these features in terms of
the solitonic potential and the stability properties of the respective
individual stars.
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