Departures from the Friedmann-Lemaitre-Robertston-Walker Cosmological Model in an Inhomogeneous Universe: A Numerical Examination Article Swipe

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Physics Friedmann equations Universe Theoretical physics Cosmological model Metric expansion of space Friedmann–Lemaître–Robertson–Walker metric Classical mechanics Mathematical physics Cosmology Astrophysics Dark energy

John T. Giblin , James B. Mertens , Glenn D. Starkman ·

YOU? · · 2016 · Open Access · · DOI: https://doi.org/10.1103/physrevlett.116.251301 · OA: W2099263196

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 formalism of numerical relativity in synchronous gauge. This work represents the first numerical cosmological study that is fully relativistic, nonlinear, and without symmetry. The universe that emerges exhibits an average Friedmann-Lemaître-Robertson-Walker (FLRW) behavior; however, this universe also exhibits locally inhomogeneous expansion beyond that expected in linear perturbation theory around a FLRW background.