hamari acadmi: Cosmology

Cosmology

by Steven Weinberg

The aim of this is to give self-contained explanations of the ideas and formulas that are used and tested in modern cosmological observations. The book divides into two parts, each of which in my experience teaching the subject provides enough material for a one-semester graduate course. The first part, Chapters 1 through 4, deals chiefly with the isotropic and homogeneous average universe, with only a brief introduction to the anisotropies in the microwave background in Section 2.6. These chapters are more-or-less in reverse chronological order; Chapter 1 concentrates on the universe since the formation of galaxies, corresponding roughly to redshifts z < 10; Chapter 2 deals with the microwave background, emitted at a redshift z 1, 000; Chapter 3 describes the early universe, from the beginning of the radiation dominated expansion to a redshift z ≈ 104 when the density of radiation fell below that of matter; and Chapter 4 takes up the period of inflation that is believed to have preceded the radiation dominated era. The second part, Chapters 5 through 10, concentrates on the departures from the average universe. After some general formalism in Chapter 5 and its application to the evolution of inhomogeneities in Chapter 6, Chapter 7 again describes the microwave background anisotropies, and take up the large scale structure of matter in Chapter 8. Gravitational lensing is discussed later, in Chapter 9, because its most important cosmological application may be in the use of weak lensing to study large scale structure. The treatment of inflation in Chapter 4 deals only with the average properties of the universe in the inflationary era; Chapter 10, which discusses the growth of inhomogeneities from quantum fluctuations during inflation.

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Cosmology