Download An introduction to mathematical cosmology by Jamal Nazrul Islam PDF

By Jamal Nazrul Islam

ISBN-10: 0511018495

ISBN-13: 9780511018497

This publication is a concise advent to the mathematical points of the beginning, constitution and evolution of the universe. The booklet starts off with a short assessment of observational cosmology and normal relativity, and is going directly to speak about Friedmann types, the Hubble consistent, types with a cosmological consistent, singularities, the early universe, inflation and quantum cosmology. This booklet is rounded off with a bankruptcy at the far-off way forward for the universe. The e-book is written as a textbook for complicated undergraduates and starting graduate scholars. it is going to even be of curiosity to cosmologists, astrophysicists, astronomers, utilized mathematicians and mathematical physicists.

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122) u0 ϭ( 00)Ϫ2) (Ѩui/Ѩx0)ϭ(1/2) u0 ϭ ij 00,j ij ( 1 2 ) . 124) we get (Ѩuk/Ѩx0)ϭ ik kj ( ik ϭ ␦ ij( 1 2 1 2 ) 00 , j ) ϭ( 00 , j 1 2 ) ϭ(Ѩui /Ѩx0). 125) This equation is analogous to the Newtonian equation of motion, in that the ‘acceleration’ Ѩui /Ѩx0, in units employed here, is equal to the gradient of 1 2 , which plays the role of the Newtonian gravitaa scalar, in this case 00 tional potential. 119a)), and the TLFeBOOK 36 Introduction to general relativity ␮␯,␴ and hence all Christoffel symbols to be small.

The Levi–Civita tensor density is used for defining the ‘dual’ of antisymmetric tensors, such as that of the electromagnetic field tensor F␮␯, the Yang–Mills field tensor, or, with respect to suitable indices, of the Riemann tensor (the latter are needed for some of the so-called ‘curvature invariants’, which will be mentioned later in connection with singularities). 3 Gauss and Stokes theorems We discuss the generalization to curved space of the Gauss or divergence theorem and Stokes theorem, which are used, for example, when one varies a volume or surface integral to derive some field equations.

59)). 68) TLFeBOOK Some special topics in general relativity 25 where the second relation can be verified by using the properties of determinants and matrices and the fact that ␭␮ is the inverse matrix of ␮␯. 68). 70), the following relation: ΎA ␮ ;␮ Ύ d4xϭ (A␮ ),␮d4x. 71) is an invariant. 71) into a surface integral over the threedimensional boundary Ѩ⍀ of the four-dimensional volume ⍀. 69). Integrating the latter equation over a three-dimensional volume V at a definite time x0, we get ΂Ύ V ΃ A0d3x ,0 ϭϪ Ύ ( A ), d x 3 m m V ϭ(Surface integral over ѨV, boundary of V).

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