On the Green and Wald formalism
Abstract
Backreaction in the cosmological context is a longstanding problem that is especially important in the present era of precise cosmology. The standard model of a homogeneous background plus density perturbations is most probably oversimplified and is expected to fail to fully account for the near-future observations of sub-percent precision. From a theoretical point of view, the problem of backreaction is very complicated and deserves careful examination. Recently, Green and Wald claimed in a series of papers to have developed a formalism to properly describe the influence of density inhomogeneities on average properties of the Universe, i.e., the backreaction effect. A brief discussion of this framework is presented, focussing on its drawbacks and on misconceptions that have arisen during the "backreaction debate".
Keywords
Cite
@article{arxiv.1512.02947,
title = {On the Green and Wald formalism},
author = {Jan J. Ostrowski and Boudewijn F. Roukema},
journal= {arXiv preprint arXiv:1512.02947},
year = {2017}
}
Comments
Contribution to the proceedings of MG14