Abstract
Evidence of universality is observed in the critical behavior of axisymmetric vacuum gravitational collapse. The threshold of black hole formation in the future development of time-antisymmetric initial data is found numerically and compared to previous results based on ingoing pulses of gravitational waves. The power-law behavior of the black hole mass is again found near the critical point and the critical exponent value β≃0.36 is consistent with our previous determination despite stark differences in the two sets of initial data. Similar evidence of universality is exhibited by the scaling factor Δ of the echoes in the gravitational field produced in the central region of collapse.
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