For the past 20 years causality violations and superluminal motion have been the object of intensive study as physical and geometrical phenomena. This book compiles the results of its author and also reviews other work in the field. In particular, the following popular questions are addressed: • Is causality protected by quantum divergence at the relevant Cauchy horizon? • How much "exotic matter" would it take to create a time machine or a warp drive? • What is the difference between a "discovered" time machine and a created one? • Why does a time traveler fail to kill their grandfather? • How should we define the speed of gravity and what is its magnitude?
For the past 20 years causality violations and superluminal motion have been the object of intensive study as physical and geometrical phenomena. This book compiles the results of its author and also reviews other work in the field. In particular, the following popular questions are addressed: • Is causality protected by quantum divergence at the relevant Cauchy horizon? • How much "exotic matter" would it take to create a time machine or a warp drive? • What is the difference between a "discovered" time machine and a created one? • Why does a time traveler fail to kill their grandfather? • How should we define the speed of gravity and what is its magnitude?
Barnes & Noble is the world’s largest retail bookseller and a leading retailer of content, digital media and educational products. Our Nook Digital business offers a lineup of NOOK® tablets and e-Readers and an expansive collection of digital reading content through the NOOK Store®. Barnes & Noble’s mission is to operate the best omni-channel specialty retail business in America, helping both our customers and booksellers reach their aspirations, while being a credit to the communities we serve.
