Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-12-16
Encyclopedia of Applied Physics 23(1998)47-81
Astronomy and Astrophysics
Astrophysics
52 Pages, LaTeX, (four tables included; copies of 10 color photographs may be requested by e-mail). Prepared for 'From Quantum
Scientific paper
An introductory account is given of the understanding of the structure of the universe. At present the most plausible theory of the origin of the universe is that it formed from the explosion of an extremely hot and dense fireball several billion years ago. During the first few seconds after the big bang, the energy density was so great that only fundamental particles (leptons, quarks, gauge bosons) existed. As the universe cooled and expanded after the big bang, nuclei and atoms formed and condensed into galaxies and stars and systems of them. The fundamental particles and a wide range of gravitational aggregates of them constitute the small-scale and large-scale structure of the present universe. The current knowledge of the elements of the structure of the universe based on the standard big bang model and the standard model of fundamental particles is considered.
Haubold Hans Joachim
Mathai Arak Mathai
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