On the ratio of lapses in bimetric relativity
arXiv:1903.09646 · doi:10.1088/1361-6382/ab497a
Abstract
The two lapse functions in the Hassan-Rosen bimetric theory are not independent. Without knowing the relation between them, one cannot evolve the equations in the 3+1 formalism. This work computes the ratio of lapses for the spherically symmetric case, which is a prerequisite for numerical bimetric relativity.
the ancillary files contain the Mathematica notebooks and the main paper with color-highlighted variables