A Unified Grand Tour of Theoretical Physics - download pdf or read online

By Ian D. Lawrie

ISBN-10: 0750306041

ISBN-13: 9780750306041

A Unified Grand travel of Theoretical Physics invitations its readers to a guided exploration of the theoretical principles that form our modern realizing of the actual global on the primary point. Its critical issues, comprising space-time geometry and the overall relativistic account of gravity, quantum box concept and the gauge theories of basic forces, and statistical mechanics and the speculation of part transitions, are built in specific mathematical element, with an emphasis on conceptual realizing. hassle-free remedies of the normal versions of particle physics and cosmology are supplemented with introductory bills of extra speculative theories, together with supersymmetry and string theory.

This 3rd version of the Tour encompasses a new bankruptcy on quantum gravity, concentrating on the method often called Loop Quantum Gravity, whereas new sections supply prolonged discussions of subject matters that experience develop into widespread in recent times, akin to the Higgs boson, mammoth neutrinos, cosmological perturbations, darkish power and topic, and the thermodynamics of black holes.

Designed for these looking for a superb clutch of the interior workings of those theories, yet preferring to prevent a full-scale attack at the examine literature, the Tour assumes as its element of departure a familiarity with easy undergraduate-level physics, and emphasizes the interconnections among points of physics which are extra frequently handled in isolation.

The better half web site at www.unifiedgrandtours.org offers additional assets, together with a entire handbook of ideas to the end-of-chapter exercises.

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Any specific function, such as the Pythagoras expression, would have quite different effects when applied to different coordinate systems, and the definition of the manifold certainly does not single out a special coordinate system to which that function would apply. We do have a more or less unambiguous means of determining distances on a sheet of paper, and this is because the paper, in addition to the topological properties it possesses as a manifold, has physical properties that enable us to apply a definite measuring procedure.

There are, indeed, important situations in which the connection is symmetric in µ µ its two lower indices: νσ = σ ν . In general, however, it is the last index that corresponds to that of ∇σ . Since DV µ /dλ and dx σ /dλ are both vectors, it follows from their transformation laws that the functions ∇σ V µ are the components of a rank 11 tensor, with the transformation law ∇σ V µ = σ σ µ µ µ ∇σ V . 25) From this, we can deduce the transformation law for the connection coefficients themselves, which can be written as µ νσ = µ µ ν ν σ σ µ νσ + µ ν ∂σ ν ν .

Readers should not panic yet, though. Many of the most important applications of general relativity (including all those to be discussed in this book) do not require the complete Riemann tensor. In practice, we shall need only a simpler tensor derived from it. This is the Ricci tensor, defined by contracting two indices of the Riemann tensor: Rµν ≡ R λµλν = λ µν,λ − λ µλ,ν + λ σ σ λ µν − λ σν σ µλ . 36) Although the definition still looks complicated, the components of this tensor can often be calculated with just a little patience, and it is relatively simple to use thereafter.

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A Unified Grand Tour of Theoretical Physics by Ian D. Lawrie


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