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

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.

preprint2016arXivOpen access
John T. Giblin JrJames B. MertensGlenn D. Starkman
astro-ph.COgr-qc
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John T. Giblin JrJames B. MertensGlenn D. Starkman

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