TY - JOUR
T1 - Beyond ΛCDM
T2 - problems, solutions, and the road ahead
AU - Bull, Philip
AU - Akrami, Yashar
AU - Adamek, Julian
AU - Baker, Tessa
AU - Bellini, Emilio
AU - Jiménez, Jose Beltrán
AU - Bentivegna, Eloisa
AU - Camera, Stefano
AU - Clesse, Sébastien
AU - Davis, Jonathan H.
AU - Dio, Enea Di
AU - Enander, Jonas
AU - Heavens, Alan
AU - Heisenberg, Lavinia
AU - Hu, Bin
AU - Llinares, Claudio
AU - Maartens, Roy
AU - Mörtsell, Edvard
AU - Nadathur, Seshadri
AU - Noller, Johannes
AU - Pasechnik, Roman
AU - Pawlowski, Marcel S.
AU - Pereira, Thiago S.
AU - Quartin, Miguel
AU - Ricciardone, Angelo
AU - Riemer-Sørensen, Signe
AU - Rinaldi, Massimiliano
AU - Sakstein, Jeremy
AU - Saltas, Ippocratis D.
AU - Salzano, Vincenzo
AU - Sawicki, Ignacy
AU - Solomon, Adam R.
AU - Spolyar, Douglas
AU - Starkman, Glenn D.
AU - Steer, Danièle
AU - Tereno, Ismael
AU - Verde, Licia
AU - Villaescusa-Navarro, Francisco
AU - Strauss, Mikael von
AU - Winther, Hans A.
PY - 2016/6
Y1 - 2016/6
N2 - 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.
AB - 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.
KW - astro-ph.CO
KW - astro-ph.GA
KW - gr-qc
KW - hep-ph
KW - hep-th
KW - RCUK
KW - STFC
KW - ST/L00075X/1
KW - Cosmology
KW - Dark energy
KW - Cosmological constant problem
KW - Modified gravity
KW - Dark matter
KW - Early universe
U2 - 10.1016/j.dark.2016.02.001
DO - 10.1016/j.dark.2016.02.001
M3 - Article
VL - 12
SP - 56
EP - 99
JO - Physics of the Dark Universe
JF - Physics of the Dark Universe
ER -