Abstract
In 1965, the discovery of a new type of uniform radiation, located between radiowaves and infrared light, was accidental. Known today as Cosmic Microwave background (CMB), this diffuse radiation is commonly interpreted as a fossil light released in an early hot and dense universe and constitutes today the main ’pilar’ of the big bang cosmology. Considerable efforts have been devoted to derive fundamental cosmological parameters from the characteristics of this radiation that led to a surprising universe that is shaped by at least three major unknown components: inflation, dark matter and dark energy. This is an important weakness of the present consensus cosmological model that justifies raising several questions on the CMB interpretation. Can we consider its cosmological nature as undisputable? Do other possible interpretations exist in the context of other cosmological theories or simply as a result of other physical mechanisms that could account for it? In an effort to questioning the validity of scientific hypotheses and the under-determination of theories compared to observations, we examine here the difficulties that still exist on the interpretation of this diffuse radiation and explore other proposed tracks to explain its origin. We discuss previous historical concepts of diffuse radiation before and after the CMB discovery and underline the limit of our present understanding.
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Notes
Note that the discovery of the 3 K radiation could have been attributed to a French team. Jean-François Denisse, James Lequeux and Emile Roux, three physicists at the Ecole Normale of Paris, observing with a German Würzburg radar antenna at the wavelength of 33cm, reported in a communication to the Academy of sciences on 17 June 1957, 7 years before Penzias and Wilson: “Our measures have however shown that the sky brightness temperature is less than 3 K and its variations from one point to another is less than 0,5 degree”. This is the first known measure of this famous diffuse radiation, though the authors did not realize the scope of their observation. See Denisse J.F., Lequeux J., Le Roux E. (1957) “Nouvelles observations du rayonnement du ciel sur la longueur d’onde 33 cm”, CR Acad Sci 244, 3030.
Concerning MOND, see also the critics based on the observations of colliding clusters (Clowe et al. (2006) “ A Direct Empirical Proof of the Existence of Dark Matter ”,ApJ. 648, L109) and the rebuttal by Mc Gaugh (http://astroweb.case.edu/ssm/mond/bullet_comments.html)
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Bonnet-Bidaud, JM. The Diffuse Light of the Universe. Found Phys 47, 851–869 (2017). https://doi.org/10.1007/s10701-016-0056-1
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DOI: https://doi.org/10.1007/s10701-016-0056-1