Beyond $\Lambda$CDM: Problems, solutions, and the road ahead

Abstract : Despite its continued observational successes, there is a persistent (and growing) interest in extending cosmology beyond the standard model, $\Lambda$CDM. This is motivated by a range of apparently serious theoretical issues, involving such questions as the cosmological constant problem, the particle nature of dark matter, the validity of general relativity on large scales, the existence of anomalies in the CMB and on small scales, and the predictivity and testability of the inflationary paradigm. In this paper, we summarize the current status of $\Lambda$CDM as a physical theory, and review investigations into possible alternatives along a number of different lines, with a particular focus on highlighting the most promising directions. While the fundamental problems are proving reluctant to yield, the study of alternative cosmologies has led to considerable progress, with much more to come if hopes about forthcoming high-precision observations and new theoretical ideas are fulfilled.
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Soumis le : lundi 25 janvier 2016 - 12:22:09
Dernière modification le : lundi 10 septembre 2018 - 14:42:06

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Philip Bull, Yashar Akrami, Julian Adamek, Tessa Baker, Emilio Bellini, et al.. Beyond $\Lambda$CDM: Problems, solutions, and the road ahead. Physics of the Dark Universe, Elsevier, 2016, 12, pp.56-99. 〈10.1016/j.dark.2016.02.001〉. 〈hal-01261435〉



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