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While the use of numerical general relativity for modeling astrophysicalphenomena and compact objects is commonplace, the application to cosmologicalscenarios is only just beginning. Here, we examine the expansion of a spacetimeusing the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formalism of numericalrelativity in synchronous gauge. This work represents the first numericalcosmological study that is fully relativistic, non-linear and without symmetry.The universe that emerges exhibits an averageFriedmann-Lema\"itre-Robertston-Walker (FLRW) behavior, however this universealso exhibits locally inhomogeneous expansion beyond that expected in linearperturbation theory around a FLRW background.

Departures from the FLRW Cosmological Model in an Inhomogeneous Universe: A Numerical Examination