By Derek Raine, E.G. Thomas
This quantity is a radical advent to trendy rules on cosmology and at the actual foundation of the overall thought of relativity. many of the theories and concepts in 'big bang' cosmology are mentioned intimately, supplying an perception into present difficulties. The publication is written at an intermediate point. past that of the numerous common books on cosmology, and offers an creation to the extra complex works and examine literature.
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Extra resources for An Introduction to the Science of Cosmology (Series in Astronomy and Astrophysics)
From this we conclude that the visible part of a galaxy is immersed inside a large halo of dark matter which contains most of its mass. In the appendix, at the end of the chapter, we derive the virial theorem relating the gravitational potential energy and internal kinetic energy of a gravitating system in equilibrium. 6. Finally everything is brought together and a value for the density parameter is obtained. The conclusion that most of the matter is non-luminous or dark matter is explained. A further and very surprising conclusion is that most of the matter content of the Universe is not protons, neutrons and electrons but an as yet unidentiﬁed non-baryonic type of matter.
3 we outline the determination of the mean luminosity density. 4 describes the determination of the mass-to-luminosity ratio of a galaxy. From this we conclude that the visible part of a galaxy is immersed inside a large halo of dark matter which contains most of its mass. In the appendix, at the end of the chapter, we derive the virial theorem relating the gravitational potential energy and internal kinetic energy of a gravitating system in equilibrium. 6. Finally everything is brought together and a value for the density parameter is obtained.
So we ﬁnd that CP symmetry is preserved in experiments involving the strong interaction, but not in those involving weak interactions. The axion is a hypothetical particle which has the role of preventing CP violation in quantum chromodynamics, the theory of the strong force. If axions exist they are expected to constitute a signiﬁcant fraction of the cold dark matter. Their mass is expected to lie in the range 10−6 –10−3 eV/c2 , so their number density at our location in the Galaxy would be in the range 1012–1014 cm−3 .
An Introduction to the Science of Cosmology (Series in Astronomy and Astrophysics) by Derek Raine, E.G. Thomas