By Eric Baird
ISBN-10: 0955706807
ISBN-13: 9780955706806
ISBN-10: 0955706823
ISBN-13: 9780955706820
Relativity conception has develop into one of many icons of 20th Century technological know-how. it is reckoned to be a tricky topic, taught as a layered sequence of more and more tough arithmetic and more and more summary techniques. we are advised that relativity thought is meant to be this advanced and counter-intuitive. yet how a lot of this old complexity is basically precious? will we skip the interpretations and paradoxes and pseudoparadoxes of Einstein's particular thought and bounce on to a deeper and extra intuitive description of truth? What if curvature is a primary a part of physics, and a last thought of relativity can not lessen to Einstein's "flat" 1905 concept //on principle//? "Relativity..." takes us on a whistlestop journey of 20th Century physics - from black holes, quantum mechanics, wormholes and the massive Bang to the workings of the human brain, and asks: what may physics appear like with no particular relativity? 394 revealed pages, 234×156 mm, ~200 figures and illustrations, contains bibliography and index www.relativitybook.com
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Extra info for Relativity in curved spacetime : life without special relativity
Sample text
4. Do not the Rays of Light which fall upon Bodies, and are reflected or refracted, begin to bend before they arrive at the Bodies … ? " Isaac Newton, "Opticks" (1704 edition onwards) " By no means, sir: Time travels in divers paces with divers persons. I'll tell you who Time ambles withal, who Time trots withal, who Time gallops withal and who he stands still withal. " Rosalind, "As You Like It" act 3 scene 2, William Shakespeare " Space is precisely analogous with time. " "Time and Space", Edgar Allen Poe, 1844 " I have no objections to Budde's conception of space as a sort of medium … although I think that the properties of this medium should be demonstrable physically in some other manner, and that they should not be assumed ad hoc.
So, what is gravity? There are many possible answers: we might say, gravity is "a variation in the speed of light", or "a variation in the rate of timeflow or inertia", or "spacetime curvature". We might try to define it in all sorts of ways. Gravity is pretty fundamental. It existed long before we did, and long before language, so instead of trying to give a single prescriptive definition of what gravity is (by comparing it to something else), we'll try to describe what gravity does, and the way that it seems to do it, and hopefully that'll give us a good enough answer.
12 2 Gravity, Energy and Mass " Are not gross Bodies and Light convertible into one another, and may not Bodies receive much of their Activity from the Particles of Light which enter their Composition? For all fix'd Bodies being heated emit Light so long as they continue sufficiently hot, and Light mutually stops in Bodies as often as its Rays strike upon their Parts, as we shew'd above. The changing of Bodies into Light, and Light into Bodies, is very conformable to the Course of Nature, which seems delighted with Transmutations.