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

Abstract

While the use of numerical general relativity for modeling astrophysical phenomena and compact objects is commonplace, the application to cosmological scenarios is only just beginning. Here, we examine the expansion of a spacetime using the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formalism of numerical relativity in synchronous gauge. This work represents the first numerical cosmological study that is fully relativistic, non-linear and without symmetry. The universe that emerges exhibits an average Friedmann-Lemaïtre-Robertston-Walker (FLRW) behavior, however this universe also exhibits locally inhomogeneous expansion beyond that expected in linear perturbation theory around a FLRW background.

Updated to match published version

References in corpus (4)

• Effects of nonlinear inhomogeneity on the cosmic expansion with numerical relativity
• Implementation of standard testbeds for numerical relativity
• Spatially averaged cosmology in an arbitrary coordinate system
• Ricci focusing, shearing, and the expansion rate in an almost homogeneous Universe

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