A number of codes for general-relativistic simulations of cosmological structure formation have been developed in recent years. Here we demonstrate that a sample of these codes produce consistent results beyond the Newtonian regime. We simulate solutions to Einstein's equations dominated by gravitomagnetism-a vector-type gravitational field that does not exist in Newtonian gravity and produces frame-dragging, the leading-order post-Newtonian effect. We calculate the coordinate-invariant effect on intersecting null geodesics by performing ray tracing in each independent code. With this observable quantity, we assess and compare each code's ability to compute relativistic effects.
- general relativity
- numerical relativity
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Adamek, J. (Creator), Barrera-Hinojosa, C. (Creator), Bruni, M. (Creator), Li, B. (Creator), MacPherson, H. J. (Creator) & Mertens, J. B. (Creator), IOP Publishing, 10 Jul 2020