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Backreaction: directions of progress
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Homogeneous and isotropic cosmological models with ordinary matter and gravity predict slower expansion and shorter distances than observed. It is possible that this failure is due the known breakdown of homogeneity and isotropy related to structure formation, rather than new fundamental physics. We review this backreaction conjecture, concentrating on topics on which there has been progress as well as open issues.
Forward citations
Cited by 2 Pith papers
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Nonlinear Lattice Framework for Inflation: Bridging stochastic inflation and the $\delta{N}$ formalism
A shear-free locally FLRW lattice framework for single-field inflation captures spatially varying expansion, curvature corrections, and nonlinear δN observables at a fraction of the cost of full numerical relativity.
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Einstein-Vlasov Calculations of Structure Formation
Full Einstein-Vlasov simulations show Newtonian N-body collapse is faster than general relativity for extreme density perturbations, but accurate at subpercent level for standard cosmological amplitudes.
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