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Home Search Quick Search Advanced Fulltext Browse Collections Persons My eDoc Session History Login Name: Password: Documentation Help Support Wiki Direct access to document ID:	Institute: MPI für Gravitationsphysik     Collection: Geometric Analysis and Gravitation     Display Documents   history ID: 3369.0, MPI für Gravitationsphysik / Geometric Analysis and Gravitation Type II Critical Collapse of a Self-Gravitating Nonlinear Sigma Model Authors: Husa, Sascha; Lechner, Christiane; Pürrer, Michael; Thornburg, Jonathan; Aichelburg, Peter C. Language: English Date of Publication (YYYY-MM-DD): 2000 Title of Journal: Physical Review D Volume: 62 Sequence Number of Article: 104007 Review Status: Peer-review Audience: Not Specified Abstract / Description: We report on the existence and phenomenology of type II critical collapse within the one-parameter family of SU(2) sigma models coupled to gravity. Numerical investigations in spherical symmetry show discretely self-similar (DSS) behavior at the threshold of black hole formation for values of the dimensionless coupling constant eta ranging from 0.2 to 100; at 0.18 we see small deviations from DSS. While the echoing period Delta of the critical solution rises sharply towards the lower limit of this range, the characteristic mass scaling has a critical exponent gamma which is almost independent of eta, asymptoting to 0.1185ą0.0005 at large eta. We also find critical scaling of the scalar curvature for near-critical initial data. Our numerical results are based on an outgoing–null-cone formulation of the Einstein-matter equations, specialized to spherical symmetry. Our numerically computed initial-data critical parameters p* show second order convergence with the grid resolution, and after compensating for this variation in p*, our individual evolutions are uniformly second order convergent even very close to criticality. External Publication Status: published Document Type: Article Communicated by: Gerhard Huisken Affiliations: MPI für Gravitationsphysik/Geometric Analysis and Gravitation Full Text: You have privileges to view the following file(s): 3369.pdf  [448,00 Kb] [Comment:arXiv]     The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.