About Time: Einstein's Unfinished Revolution

About Time: Einstein's Unfinished Revolution

by Paul Davies
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About Time : Einstein's Unfinished Revolution 5 out of 5 based on 0 ratings. 4 reviews.
Anonymous More than 1 year ago
Guest More than 1 year ago
This is the best book on the subject of time I've read. For non-scientists like myself, I'd say that if you are only going to read one book in your life on the subject of Time, make it this one.
Guest More than 1 year ago
The books tries to define how time behaves in physics. Possibilities of travel to the past are looked at. It's amazing how Einstein worked out how time could be slowed down... Read this book if you want to understand terms like tachyons, blackholes, gravitational and velocity time dilation...
Guest More than 1 year ago
Paul explained it in ways that were easy for me and really anyone to understand. My favourite chapter is Time travel:Fact or fantasy. He reveals several ways to build time machines. He tells us about complex physics theories in simple terms. Special and general relativity are meantioned and explained in detail. We learn about the time dilation effect and how we can time-travel into the future. The ways to build a time machine are not practical as you need things like cosmic strings(which may have been created in the early universe). I was impressed by the diagrams which made the ideas easier to understand. I was surprised and pleased by how much I could understand. When he describes how a wormhole could be made into a time machine I read amazed... Travel in time backwards is more than science fiction because Kip Thorne showed how it might be possible and how we might do it. 1, Find a wormhole i.e. enlarge one from quantum foam using anti-gravity aimed correctly so the wormhole becomes macroscopic. 2, Using high speeds or gravity move the mouths(ends)away from each other i.e.hold one mouth in strong gravity or move it at a high speed(direction is unimportant). 3, When the mouths travel with time at relative speeds a time machine is built! Going in one mouth will take you to a different point in time and space! A major problem with this plan is that a huge amount of anti-gravity is needed to feed the wormhole. This pushes the walls of the wormhole appart prevents the wormhole from collapsing. Anti-gravity also defocuses energy preventing the destruction of the wormhole. Also you either need to move the mouths at relative speeds or put one in intense gravity. But no known laws of physics forbid it and people who have researched solutions to general relativity have found nothing that would prevent time-travel to the past(although it might be difficult)! Will we succeed with it? Time will tell! This is a book for people who want to learn about the science behind time and time-travel. Some books like The Time Machine and Contact are meantioned. Other fictional work like Back to the Future is used as an example when the paradoxes of time-travel are explained. What would happen if you went back in time and killed you grandmother when she was a baby? You COULDN'T exist as you could never have been born... Paul reveals why some scientists rule out time-travel and how to solve what is otherwise impossible. Quantum theories tell us what might be happening. He suggests that time might not really be passing at all!