George Smoot: The design of the universe. Jupiter sounds (so strange!) NASA-Voyager recording. Why do we have a Universe of something rather than nothing? THINK ABOUT NATURE. And up until the modern era, where we describe them in quantum mechanics, the laws also never changed.
The laws lets us predict where the positions of the atoms will be at a later time, if we know the positions of all the atoms at a given moment. That's how we do physics and I call that the Newtonian Paradigm because it was invented by Newton. And behind the Newtonian Paradigm is the idea that the laws of nature are timeless; they act on the system, so to speak, from outside the system and they evolve from the past to the present to the future.
If you know the state any time, you can predict the state at any other time. So this is the framework for doing physics and it's been very successful. The problem that I've identified—that I think is at the root of a lot of the spinning of our wheels and confusion of contemporary physics and cosmology—is that you can't just take this method of doing science and scale it up to the universe as a whole. Now some of this is not new. Stephen Hawking: "Time Travel to the Future is Possible" Needed for assembly: "One wormhole, the Large Hadron Collider, or a rocket that goes really, really fast. " Stephen Hawking thinks for of the world's physicists are wrong believing that time travel is impossible: Hawking sides with Sir Arthur Clarke, author of Space Odyssey 2001 who famously stated that "when a distinguished scientist states that something is impossible, he is very probably wrong".
And a lot of distinguished scientists believe that just "Time travel is absolutely impossible". Hawking says: "Although I cannot move and I have to speak through a computer, in my mind I am free. Free to explore the universe and ask the big questions, such as: is time travel possible? Can we open a portal to the past or find a shortcut to the future? Several of the planet's leading scientists, including Charles Liu (author of "One Universe: At Home In The Cosmos"), Brian Greene (of "The Elegant Universe") and Michio Kaku ("Hyperspace") float a raft of objections to the concept of time travel.
The Hole Argument. 1.
Modern Spacetime Theories: A Beginner's Guide Virtually all modern spacetime theories are now built in the same way. The theory posits a manifold of events and then assigns further structures to those events to represent the content of spacetime. A standard example is Einstein's general theory of relativity. As a host for the hole argument, we will pursue one of its best known applications, the expanding universes of modern relativistic cosmology. This one example illustrates the core content of the hole argument. Here are the two, basic building blocks of modern, relativistic cosmology: a manifold of events and the fields defined on it. Manifold of Events. So far, all we have defined is a set of events. Figure 1. Metrical Structure and Matter Fields. These additional properties are introduced by specifying the metric field. Figure 2. The matter of the universe is represented by matter fields. Figure 3. 2. Figure 4. Figure 5 illustrates a second way: Figure 5. 3.
Leonard Susskind on The World As Hologram. 30 January 09.
Karat. This WIll Blow Your Mind. – The Known Universe.