Brane Worlds and M-theory
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Extra dimensions are M-theory's most outlandish prediction. One of the main theoretical issues in theories with extra dimensions is that of determining their size - Moduli stabilization. In Brane Worlds models, the observable universe is regarded as a 3 + 1_dimensional surface embedded in a 3 + 1 + d_dimensional spacetime. Standard model particles and fields are trapped on the brane and only gravity is free to access the bulk. At low energies, gravity is localized at the 3+1_dimensional brane allowing General Relativity to be recovered. At high energies, gravity leaks into the higher dimension...
Extra dimensions are M-theory's most outlandish prediction. One of the main theoretical issues in theories with extra dimensions is that of determining their size - Moduli stabilization. In Brane Worlds models, the observable universe is regarded as a 3 + 1_dimensional surface embedded in a 3 + 1 + d_dimensional spacetime. Standard model particles and fields are trapped on the brane and only gravity is free to access the bulk. At low energies, gravity is localized at the 3+1_dimensional brane allowing General Relativity to be recovered. At high energies, gravity leaks into the higher dimensional bulk, behaving in a truly higher dimensional theory. This book describes the main features of different extra dimensional theories of quantum gravity and sheds the light on some important aspects such as vacuum energy, moduli stabilization and gaugino condensates in the framework of five dimensional heterotic M-theory.
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