Gundlach, Carsten (1997) Echoing and scaling in Einstein-Yang-Mills critical collapse. Physical Review D, 55 (10), 6002-6013. (doi:10.1103/PhysRevD.55.6002).
Abstract
We confirm recent numerical results of echoing and mass scaling in the gravitational collapse of a spherical Yang-Mills field by constructing the critical solution and its perturbations as an eigenvalue problem. Because the field equations are not scale invariant, the Yang-Mills critical solution is asymptotically, rather than exactly, self-similar, but the methods for dealing with discrete self-similarity developed for the real scalar field can be generalized. We find an echoing period ?=0.73784±0.00002 and a critical exponent for the black hole mass ?=0.1964±0.0007.
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