Einstein's Theories of Relativity and Gravitation by Albert Einstein, is part of the HackerNoon Books Series. You can jump to any chapter in this book here. New Concepts for Old

NEW CONCEPTS FOR OLD

What the World Looks Like After Einstein Has Had His Way With It

BY JOHN G. McHARDY, COMMANDER R.N.,
LONDON

“The new-created world, which fame in heaven
Long had foretold, a fabric wonderful,
Of absolute perfection.”

Einstein’s Theory of Relativity has led to determining a key law of nature—the law of gravitation—which is also the basic law of mechanics. Thus it embraces a whole realm of physics, and promises, through the researches of Professor Weyl, to embrace another realm—electro-dynamics. Its limitations are not yet reached, for Einstein has already postulated therefrom a theory of a finite, yet unbounded, universe. This essay, however, is mainly concerned with mechanics, and electrical forces are not considered.

To have synthesised Newton’s two great principles—his law of motion and law of gravitation—interpreting in the process the empirical law of equality of gravitational and inertial mass, is alone an immense achievement; but Einstein’s researches have opened up a new world to the physicist and [252]philosopher which is of greater importance. He has given us a vision of the immaterial world, a geometrical or mathematical vision, which is more satisfying than the “ether” conceptions hitherto presented. The fabric of his vision is not baseless. It is this fabric we shall consider, touching on certain aspects of the Einstein theory in the endeavor to present an image in miniature of his edifice of thought and to show the firmness of its foundations. That they are well and truly laid was demonstrated by the verification, from observations made during the solar eclipse in 1919, of Einstein’s prediction of the displacement of a wave of light in a gravitational field, showing light to have the property of weight.

The physical world is shown by Einstein to be a world of “relations.” Underlying it there is an absolute world of which physical phenomena are the manifestation. “Give me matter and motion,” says Descartes, “and I will construct the world.” “Give me a world in which there are ordered relations,” says the Relativist, “and I will show you the behavior of matter therein” (mechanics). We first view this underlying world as an abstraction, abstracting energy (“bound” as in matter and electrons, “free” as in light), and its attribute force. This abstraction we will call the “World-Frame.” Later, we will study the underlying world in connection with energy, and will call this absolute world the “World-Fabric.” The connection between the geometrical character of the World-Frame and the geometrical characters of the World-Fabric is the key to the law of gravitation.

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This book is part of the public domain. Albert Einstein (2020). Einstein's Theories of Relativity and Gravitation. Urbana, Illinois: Project Gutenberg. Retrieved October 2022.

This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.org, located at https://www.gutenberg.org/cache/epub/63372/pg63372-images.html

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