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- Modified Newtonian dynamics.
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- 1. EARLY HISTORY?
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- How dark matter came to matter.
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Seller assumes all responsibility for this listing. Item specifics Condition: New: A new, unread, unused book in perfect condition with no missing or damaged pages. See the seller's listing for full details. See all condition definitions — opens in a new window or tab Read more about the condition. About this product. Most astronomers and physicists now believe that the matter content of the Universe is dominated by dark matter: hypothetical particles which interact with normal matter primarily through the force of gravity.
Though invisible to current direct detection methods, dark matter can explain a variety of astronomical observations. This book describes how this theory has developed over the past 75 years, and why it is now a central feature of extragalactic astronomy and cosmology.
Current attempts to directly detect dark matter locally are discussed, together with the implications for particle physics. For example, Fabris et al. Their results indicate that a cosmology completely dominated by the Chaplygin gas is favored in comparison to L CDM models. Recently, Avelino et al. The trajectories of statefinder parameters  in this class of scenarios were studied in Ref. The search for cosmologies driven by dark energy is presently in vogue.
The leitmotiv is the observational support for an accelerated Universe provided by the type Ia supernovae SNe experiments at intermediate and high redshifts. This short review focused on some alternative candidates to dark energy. However, different from dark matter, the extra dark energy component is intrinsically relativistic and its negative pressure is required by the present accelerating stage of the Universe. Its tiny density and weak interaction presumably preclude the possibility of identification in the terrestrial laboratory.
Unfortunately, even considering that we are in the golden age of empirical cosmology, the existing data are still unable to discriminate among the different dark energy candidates, thereby signaling that we need better observations in order to test the basic predictions. In particular, this means that the determination of cosmological parameters will continue to be a central goal in the near future.
The fundamental aim is to shed some light on the nature of the dark energy. On the other hand, since the current models are more complicated than the Einstein-de Sitter Universe, such a situation is somewhat uncomfortable either from theoretical or observational viewpoints.
It has also to be admitted that none dark energy model has been successful enough to deserve the status of a ''standard model". However, the present time for many cosmologists is very exciting because although preserving some aspects of the basic physical picture, the new invisible actor dark energy which has not been predicted by particle physics, and is responsible for repulsive gravity, may alter profoundly the traditional view of space-time and matter.
I am indebted to G. Steigman, J. Alcaniz, N. Pires, R. Silva, J. Cunha and R. Santos for many helpful discussions. Perlmutter et al. Riess et al. Knox and L. Page, PRL 85 ; A. Jaffe et al. Carlberg et al. Dekel, D. Burstein and S. Turok World Scientific, Singapore ; P. Peebles, in Formation of Structure in the Universe, edited by A. Dekel and J. Ostriker, Cambridge UP, Cambridge Dunlop et al.pierreducalvet.ca/181575.php
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Yoshii, T. Tsujimoto and K. Kawara, ApJ , L ; J. Alcaniz and J.
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Lima, Astrop. Steigman and J. Felten, Space Sci. Steigman, N.