When you were a kid, did you dream of becoming an astronaut? Or maybe a ballerina? Assuming you didn’t pursue either of those careers, are those versions of you out there now, orbiting and pirouetting in other dimensions?
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Dr. Kaku addresses the question of whether the so-called Higgs-Boson, or God particle has been overhyped, and what its discovery would mean for physics. 
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Why does our universe look the way it does? In particular, why do we only experience three spatial dimensions in our universe, when superstring theory, for instance, claims that there are ten dimensions -- nine spatial dimensions and a tenth dimension of time? Japanese scientists think they may have an explanation for how a three-dimensional universe emerged from the original nine dimensions of space. They describe their new supercomputer calculations simulating the birth of our universe in a forthcoming paper in Physical Review Letters.
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In this excerpt from his lecture for The Floating University, Dr. Kaku explains that time machines do not violate Einstein's laws of physics, and that – difficult though it might be – future humans would be wise to build one and slip through a wormhole to one of the alternate dimensions proposed by string theory before the cooling universe extinguishes all known life.
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To understand the ideas and aims of string theory, it's useful to look back and see how physics has developed from Newton's time to the present day. One crucial idea that has driven physics since Newton's time is that of unification: the attempt to explain seemingly different phenomena by a single overarching concept. Perhaps the first example of this came from Newton himself, who in his 1687 work Principia Mathematicae explained that the motion of the planets in the solar system, the motion of the Moon around the Earth, and the force that holds us to the Earth are all part of the same thing: the force of gravity. We take this for granted today, but pre-Newton the connection between a falling apple and the orbit of the Moon would have been far from obvious and quite amazing.
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To make things clear - Maldacena's universe is not like the one we actually live in! It's a model, a toy universe, which comes complete with its own physics. It's a hologram because all the physical goings-on inside it can be described by a physical theory that's only defined on the boundary. What's more, it's a universe in which the gravity/quantum conundrum has been resolved completely: the boundary theory is purely quantum, it contains no gravity, but a being living in the interior will still experience gravity. Gravity in this universe is part of the holographic illusion. More on COSMOLOGY: http://www.scoop.it/t/science-news?tag=cosmology Via Dr. Stefan Gruenwald, Pradeep Kr. Banerjee
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Today, Dr. Kaku addresses the question of whether the so-called Higgs Boson, or God particle has been overhyped, and what its discovery would mean for physics.
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This new paper demonstrates, for the first time, that our 3-D space appears naturally … from the 9-D space that string theory originally has,” says Jun Nishimura of the High Energy Accelerator Research Organization in Tsukuba, Japan. He and his colleagues will publish their findings in an upcoming issue of Physical Review Letters.
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String theorists have used matrices to model the birth of the universe – the moment when three spatial dimensions broke free from the other six and expanded to produce the universe's 3D structure.
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