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Beyond ΛCDM : Problems, solutions, and the road ahead

Bull, Philip; Akrami, Yashar; Adamek, Julian; Baker, Tessa; Bellini, Emilio; Beltrán Jiménez, Jose; Bentivegna, Eloisa; Camera, Stefano; Clesse, Sébastien and Davis, Jonathan H., et al. (2016) In Physics of the Dark Universe 12. p.56-99
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... (More)

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.

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Contribution to journal
publication status
published
subject
keywords
Cosmological constant problem, Cosmology, Dark energy, Dark matter, Early universe, Modified gravity
in
Physics of the Dark Universe
volume
12
pages
44 pages
publisher
Elsevier
external identifiers
  • Scopus:84960329855
ISSN
2212-6864
DOI
10.1016/j.dark.2016.02.001
language
English
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yes
id
ac288e34-6d67-475f-803e-ef62aa21ee66
date added to LUP
2016-04-27 16:42:03
date last changed
2016-12-04 04:50:48
@misc{ac288e34-6d67-475f-803e-ef62aa21ee66,
  abstract     = {<p>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.</p>},
  author       = {Bull, Philip and Akrami, Yashar and Adamek, Julian and Baker, Tessa and Bellini, Emilio and Beltrán Jiménez, Jose and Bentivegna, Eloisa and Camera, Stefano and Clesse, Sébastien and Davis, Jonathan H. and Di Dio, Enea and Enander, Jonas and Heavens, Alan and Heisenberg, Lavinia and Hu, Bin and Llinares, Claudio and Maartens, Roy and Mörtsell, Edvard and Nadathur, Seshadri and Noller, Johannes and Pasechnik, Roman and Pawlowski, Marcel S. and Pereira, Thiago S. and Quartin, Miguel and Ricciardone, Angelo and Riemer-Sørensen, Signe and Rinaldi, Massimiliano and Sakstein, Jeremy and Saltas, Ippocratis D. and Salzano, Vincenzo and Sawicki, Ignacy and Solomon, Adam R. and Spolyar, Douglas and Starkman, Glenn D. and Steer, Danièle and Tereno, Ismael and Verde, Licia and Villaescusa-Navarro, Francisco and von Strauss, Mikael and Winther, Hans A.},
  issn         = {2212-6864},
  keyword      = {Cosmological constant problem,Cosmology,Dark energy,Dark matter,Early universe,Modified gravity},
  language     = {eng},
  month        = {06},
  pages        = {56--99},
  publisher    = {ARRAY(0x8ee44c0)},
  series       = {Physics of the Dark Universe},
  title        = {Beyond ΛCDM : Problems, solutions, and the road ahead},
  url          = {http://dx.doi.org/10.1016/j.dark.2016.02.001},
  volume       = {12},
  year         = {2016},
}