What if we could find one single equation that explains every force in the universe? Dr. Michio Kaku explores how physicists may shrink the science of the Big Bang into an equation as small as Einstein's "e=mc^2." Thanks to advances in string theory, physics may allow us to escape the heat death of the universe, explore the multiverse, and unlock the secrets of existence. While firing up our imaginations about the future, Kaku also presents a succinct history of physics and makes a compelling case for why physics is the key to pretty much everything.
The big bang may not have been the beginning of the universe, but merely the beginning of one of an infinite series of universes. Two fundamental concepts in physics, both of which explain the nature of the Universe in many ways, have been difficult to reconcile with each other. European researchers have developed a mathematical approach to do so that has the potential to explain what came before the Big Bang. The big bang singularity --the single point from which the entire universe is supposed to have sprung-- is the major sticking point in the big bang theory; the calculations just can't account for such a singularity. Without evidence associated with the earliest instant of the expansion, the Big Bang theory does not provide any explanation for such an initial condition.
According to Einstein’s (classical) theory of general relativity, space is a continuum. Regions of space can be subdivided into smaller and smaller volumes without end. The fundamental idea of quantum mechanics is that physical quantities exist in discrete packets (quanta) rather than in a continuum. Further, these quanta and the physical phenomena related to them exist on an extremely small scale (Planck scale). So far, the theories of quantum mechanics have failed to ‘quantise’ gravity. Loop quantum gravity (LQG) is an attempt to do so. It represents space as a net of quantised intersecting loops of excited gravitational fields called spin networks. This network viewed over time is called spin foam.
Not only does LQG provide a precise mathematical picture of space and time, it enables mathematical solutions to long-standing problems related to black holes and the Big Bang. Amazingly, LQG predicts that the Big Bang was actually a ‘Big Bounce’, not a singularity but a continuum, where the collapse of a previous universe spawned the creation of ours.
European researchers initiated the ‘Effective field theory for loop quantum gravity’ (EFTFORLQG) project to further develop this exciting candidate theory reconciling classical and quantum descriptions of the Universe.
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