The Complete Idiot's Guide to String Theory by George Musser

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By George Musser

Everything is hooked up… We'’re dwelling in the middle of a systematic revolution that’'s captured the overall public’'s realization and mind's eye. the purpose of this new revolution is to boost a “theory of everything”— -- a collection of legislation of physics that would clarify all that may be defined, starting from the tiniest subatomic particle to the universe as an entire. right here, readers will examine the guidelines at the back of the theories, and their results upon our international, our civilization, and ourselves.

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34  The hydrogen atom consists of an electron and a proton, each of which, according to string theory, ultimately consists of vibrating strings. (Courtesy of Terry Anderson and Lance Dixon, Stanford Linear Accelerator Center) 34 The reason for this split is that gravity is special. Whenever an object exerts a force on another object, the force travels through the space between those objects. But gravity does more. It also warps space. Gravity is like a truck that doesn’t just drive down a road but also causes the road surface to buckle as it does so.

Trackside Perspective Onboard Perspective SPACE SPACE TIME TIME Two different observers slice up spacetime in two different ways depending on how fast they’re moving. 36 Part 2: The Great Clash of Worldviews Just because time is another dimension doesn’t mean it’s just another dimension. After all, you’re not free to move in time as you are in space. Time plays the special role of distinguishing cause from effect. Seeing an effect precede its cause is analogous to tilting your head so much that the left-right and up-down directions don’t just get jumbled, but swap places.

Just managing to combine relativity and quantum theory into a single theory is a step. Any theory that unites them inherits their observational successes. But physicists also seek distinctive predictions—ways that strings go beyond what we already know to reveal unanticipated aspects of the universe, something about the world that people had been blind to. It could be a deviation in the twelfth decimal place, or even further down the line. Not only must instruments have the precision to test such a prediction, they must have the discriminating power to distinguish it from a thousand confounding effects with no deeper significance.

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