Le Livre des Univers by John D. Barrow

By John D. Barrow

Ce livre explique en détail l'énigmatique notion de Multivers, l'Univers de tous les univers possibles, dont certains physiciens, parmi les plus sérieux, imaginent l'existence. Se fondant sur les travaux d'Einstein, explorant les idées des uns et des autres sur l'expansion de l'Univers, sur le voyage dans le temps, sur les mystères de l'énergie sombre et de los angeles matière noire, ou encore sur l. a. body étrange des trous noirs, John Barrow nous plonge aux coeurs des théories cosmologiques les plus actuelles et les plus excitantes.

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Then, in the early seventies, it became clear that these spherical clusters are strung together into larger filaments termed superclusters. While galaxies are a mere hundred thousand light-years across and clusters not more than ten million or so, a 15 THE COSMOLOGICAL DEBATE Fig. 1. The relative scales of "clumpy" space. supercluster might snake through a few hundred million lightyears of space. Astronomers, excited by these latest observations, began to plot the locations of galaxies on the sky to see what patterns might appear.

Astronomers, excited by these latest observations, began to plot the locations of galaxies on the sky to see what patterns might appear. One group, led by Dr. P. J. E. Peebles of Princeton, used a supercomputer to plot nearly a million galaxies; the 16 ■ THE BIG BANG NEVER HAPPENED ■ Fig. 2. The Cosmic Tapestry. Each dot represents a single galaxy. The million galaxies shown here (those visible from Lick Observatory) cluster into delicate filaments (P. J. E. Peebles). result is a lacy filigree of interwoven threads, a pattern one astronomer dubbed "the Cosmic Tapestry" (Fig.

Many of the new observations have been announced in the most prominent journals and discussed at the biggest astronomers' meetings. In some cases, the observers are among the most respected astronomers in the world. Nonetheless, cosmologists, with few exceptions, have either dismissed the observations as faulty, or have insisted that minor modifications of Big Bang theory will reconcile "apparent" contradictions. A few cosmic strings or dark particles are needed —nothing more. This response is not surprising: most cosmologists have spent all of their careers, or at least the past twenty-five years, elaborating various aspects of the Big Bang.

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