@article{44ff324b72ea42a89bfae407f6a9204c,
title = "Beyond ΛCDM: 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, ΛCDM. 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 ΛCDM 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.",
keywords = "astro-ph.CO, astro-ph.GA, gr-qc, hep-ph, hep-th, RCUK, STFC, ST/L00075X/1, Cosmology, Dark energy, Cosmological constant problem, Modified gravity, Dark matter, Early universe",
author = "Philip Bull and Yashar Akrami and Julian Adamek and Tessa Baker and Emilio Bellini and Jim{\'e}nez, {Jose Beltr{\'a}n} and Eloisa Bentivegna and Stefano Camera and S{\'e}bastien Clesse and Davis, {Jonathan H.} and Dio, {Enea Di} and Jonas Enander and Alan Heavens and Lavinia Heisenberg and Bin Hu and Claudio Llinares and Roy Maartens and Edvard M{\"o}rtsell and Seshadri Nadathur and Johannes Noller and Roman Pasechnik and Pawlowski, {Marcel S.} and Pereira, {Thiago S.} and Miguel Quartin and Angelo Ricciardone and Signe Riemer-S{\o}rensen and Massimiliano Rinaldi and Jeremy Sakstein and Saltas, {Ippocratis D.} and Vincenzo Salzano and Ignacy Sawicki and Solomon, {Adam R.} and Douglas Spolyar and Starkman, {Glenn D.} and Dani{\`e}le Steer and Ismael Tereno and Licia Verde and Francisco Villaescusa-Navarro and Strauss, {Mikael von} and Winther, {Hans A.}",
year = "2016",
month = jun,
doi = "10.1016/j.dark.2016.02.001",
language = "English",
volume = "12",
pages = "56--99",
journal = "Physics of the Dark Universe",
publisher = "Elsevier BV",
}