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Aspherical deformations of the Choptuik spacetime
Thomas W. Baumgarte
We perform dynamical and nonlinear numerical simulations to study critical phenomena in the gravitational collapse of massless scalar fields in the absence of spherical symmetry. W…
Critical collapse of ultra-relativistic fluids: damping or growth of aspherical deformations
Juliana Celestino, Thomas W. Baumgarte
We perform fully nonlinear numerical simulations to study aspherical deformations of the critical self-similar solution in the gravitational collapse of ultra-relativistic fluids.…
Numerical relativity in spherical coordinates with the Einstein Toolkit
Vassilios Mewes, Yosef Zlochower, Manuela Campanelli +3
Numerical relativity codes that do not make assumptions on spatial symmetries most commonly adopt Cartesian coordinates. While these coordinates have many attractive features, sphe…
Maximally Rotating Supermassive Stars at the Onset of Collapse: The Perturbative Effects of Gas Pressure, Magnetic Fields, Dark Matter and Dark Energy
Satya P. Butler, Alicia R. Lima, Thomas W. Baumgarte +1
The discovery of quasars at increasingly large cosmological redshifts may favor "direct collapse" as the most promising evolutionary route to the formation of supermassive black ho…
Critical gravitational collapse with angular momentum II: soft equations of state
Carsten Gundlach, Thomas W. Baumgarte
We study critical phenomena in the collapse of rotating ultrarelativistic perfect fluids, in which the pressure is related to the total energy density by , with a…