TL;DR
This paper reviews efforts to explain dark energy through cosmological backreaction, highlighting its significance in observational cosmology but noting the lack of a definitive explanation.
Contribution
It summarizes previous attempts to interpret dark energy as an effect of complex gravitational physics via backreaction.
Findings
Backreaction is relevant for precision cosmology
No convincing backreaction-based explanation for dark energy yet
Backreaction remains a promising but unresolved area in cosmology
Abstract
This work summarises some of the attempts to explain the phenomenon of dark energy as an effective description of complex gravitational physics and the proper interpretation of observations. Cosmological backreaction has been shown to be relevant for observational (precision) cosmology, nevertheless no convincing explanation of dark energy by means of backreaction has been given so far.
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