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Galaxies 2017, 5(1), 17; doi:10.3390/galaxies5010017

Small Scale Problems of the ΛCDM Model: A Short Review

1
Dipartimento di Fisica e Astronomia, University of Catania , Viale Andrea Doria 6, 95125 Catania, Italy
2
INFN Sezione di Catania, Via S. Sofia 64, I-95123 Catania, Italy
3
International Institute of Physics, Universidade Federal do Rio Grande do Norte, 59012-970 Natal, Brazil
4
Instituto de Física Teorica, Universidade Estadual de São Paulo (IFT-UNESP), Rua Dr. Bento Teobaldo Ferraz 271, Bloco 2 - Barra Funda, 01140-070 São Paulo, SP Brazil
5
Institute of Theoretical Physics Physics Department, Lanzhou University No. 222, South Tianshui Road, Lanzhou 730000, Gansu, China
6
Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, Faculdade de Ciências, Ed. C8, Campo Grande, 1769-016 Lisboa, Portugal
*
Author to whom correspondence should be addressed.
Academic Editors: Jose Gaite and Antonaldo Diaferio
Received: 30 May 2016 / Revised: 26 November 2016 / Accepted: 9 December 2016 / Published: 20 February 2017
(This article belongs to the Special Issue Dark Matter: Large versus Small Scale Structures)

Abstract

The ΛCDM model, or concordance cosmology, as it is often called, is a paradigm at its maturity. It is clearly able to describe the universe at large scale, even if some issues remain open, such as the cosmological constant problem, the small-scale problems in galaxy formation, or the unexplained anomalies in the CMB. ΛCDM clearly shows difficulty at small scales, which could be related to our scant understanding, from the nature of dark matter to that of gravity; or to the role of baryon physics, which is not well understood and implemented in simulation codes or in semi-analytic models. At this stage, it is of fundamental importance to understand whether the problems encountered by the ΛDCM model are a sign of its limits or a sign of our failures in getting the finer details right. In the present paper, we will review the small-scale problems of the ΛCDM model, and we will discuss the proposed solutions and to what extent they are able to give us a theory accurately describing the phenomena in the complete range of scale of the observed universe. View Full-Text
Keywords: cosmology; dark matter; small scale problems; ΛCDM model cosmology; dark matter; small scale problems; ΛCDM model
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Del Popolo, A.; Le Delliou, M. Small Scale Problems of the ΛCDM Model: A Short Review. Galaxies 2017, 5, 17.

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