Gravitational Collapse in Cubic Horndeski Theories
arXiv:2006.09414 · doi:10.1088/1361-6382/abb693
Abstract
We study spherically symmetric gravitational collapse in cubic Horndeski theories of gravity. By varying the coupling constants and the initial amplitude of the scalar field, we determine the region in the space of couplings and amplitudes for which it is possible to construct global solutions to the Horndeski theories. Furthermore, we identify the regime of validity of effective field theory as the sub-region for which a certain weak field condition remains small at all times. We evolve the initial data using the CCZ4 formulation of the Einstein equations and horizon penetrating coordinates without assuming spherical symmetry.
arXiv comment27 pages + 5 appendices (11 pages) + 16 figures. v2: additional figure added. Updated to match published version
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