Abstract
The Universe provides a laboratory in which it is possible to test the laws of physics in conditions which cannot be achieved in a terrestrial laboratory. The author assumes that the laws of physics are unchanging in space and time and discusses how modern developments in elementary particle physics influence our understanding of the Universe and conversely the possibility that astronomical observations may give information about elementary particle physics. In particular he studies the physics of the early Universe and discusses the role of new particles such as heavy leptons, neutrinos and quarks and the possible relationship of the net baryon number of the Universe to unified models of elementary particle physics. He considers the role of neutrinos in stellar evolution, particularly in the explosion of supernovae and in the cooling of neutron stars. Black holes are also discussed.
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