If a boundary exists as postulated in the finite universe, what is the boundary? Is the boundary a wall in space? If so, what exists beyond the wall? At the corners of the universe, what structures exist to modulate areas of higher density and less density or infinitestimal density? In addition, there is a theory of an expanding universe. How does the universe expand and what outer region accomodates this expansion.

The idea of an expanding universe admits to an expanding boundary.

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Again, this poses the earlier question. There must be free space to accomodate an expanding universe. Is this free space dense or denseless.

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This concept is similar to a computer gigobyte superstructure. Users can define different regions on the computer disc. These regions consist of utilized space and free space. Conceptually, the universe may be seen in the same way. It consists of both bounded and unbounded space. Will never collect dust From Amazon There are numerous books on general relativity currently on the market, and these range in difficulty from those written for the beginner or the layman, those written for graduate students in physics, and research monographs covering specialized topics.

It is always refreshing to go back to the originator of the subject, and take part in his special insights on the topic. Philosophers and historians of science can definitely benefit from a perusal of this book. The author begins this book with a discussion of the origin of the concepts of space-time, the emphasis being partly philosophical and partly psychological, and the reader can see the origin of the author's operationalism in reading this introduction.

He is clearly against the philosophers who attempt to remove concepts from experience and put them in his words "in the intangible heights of the a priori".

The motion of rigid bodies is used to set up a discussion of Euclidean geometry and linear orthogonal transformations. The author emphasizes the role of the physicist in discerning whether a system of geometry is true or not, contrary to the pure mathematician. Examples of geometrical invariants, such as the Cartesian line element and the volume element are discussed, along with the role of vectors and tensors.

Both of these are used as means by which one can give expression to the independence of Cartesian coordinates. Maxwell's equations are put in tensor notation as an example of covariance with respect to Cartesian coordinate transformations. All of this is done to motivate the theories of special and general relativity. The theory of spectial relativity is treated in chapter 2, the author introducing his famous principle of special relativity. The author poses the problem of calculating the coordinates and time in an inertial system moving with uniform translation relative to another.

He shows how this problem is solved by assuming that time and space are absolute, and if the coordinate axes of the systems are parallel to one another, the Galilean transformations result. Newton's equations of motion are covariant under these transformations, but Maxwell equations are not but the author chooses not to show this explicitly. He then gives an in-depth discussion of how the Lorentz transformations arise as being those that guarantee the covariance of the Maxwell equations. The author also discusses the signature of the Lorentz metric and how it is related to the light cone. He ends the chapter by developing the energy tensor of the electromagnetic field and matter.

The author's rejection of inertial frames as being priveleged leads him in the beginning of the next chapter to a short philosophical critique of the principle of inertia. This leads to a discussion of the principle of equivalence and to the origin of the general theory of relativity, a theory which the author developed, amazingly, single-handedly, and which he clearly believes is very much superior to classical mechanics. The intuition to be gained by reading this chapter is invaluable for serious students of general relativity.

One can see the simplicity and power of the author's arguments, relying on keen physical intuition and sound use of mathematics. In particular, the author's heuristic derivation of the gravitational field equations from Poisson's equation is briliant. In addition, he is not ashamed to interject philosophical argumentation into his writing, particularly in his discussion of Mach's principle.

Such discussions are becoming more rare among physicists at the present time. Einstein goes deeper.

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From Amazon The Meaning of Relativity is an advanced book. The title should have made it clear. That is, what must we change if anything Just think that he meddled with time, a concept static since so long that it is registered deep in our DNA: our concept of time goes back to the epoch where our main purpose was to survive the day sounds familiar? No, no, it was different!

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It was permanent. What you experience now is transient So what? Read it! It is a marvellous book. Perhaps you will have to reach for other, more elementary, books, in this enterprise. All right! That almost characterizes a book worth reading. It will repay your efforts.

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## lconotorcen.ml : The meaning of relativity (routledge classics) () : Albert Einstein : Books

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## Relativity

First published in , Bertrand Russell's ABC of Relativity was considered a masterwork of its time, contributing significantly to the mass popularisation of science. Authoritative and accessible, it provides a remarkable introductory guide to Einstein's theory of Relativity for a general readership. One of the most definitive reference guides of its kind, and written by one of the twentieth century's most influential philosophers, ABC of Relativity continues to be as relevant today as it was on first publication.

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