
We review recent work in which compactifications of string and M theory are constructed in which all scalar fields (moduli) are massive, and supersymmetry is broken with a small positive cosmological constant, features needed to reproduce real world physics. We explain how this work implies that there is a ``landscape'' of string/M theory vacua, perhaps containing many candidates for describing real world physics, and present the arguments for and against this idea. We discuss statistical surveys of the landscape, and the prospects for testable consequences of this picture, such as observable effects of moduli, constraints on early cosmology, and predictions for the scale of supersymmetry breaking.
66 pages, 3 figures, Latex with revtex4 macros. v3: version to appear in RMP
Compactification, High Energy Physics - Theory, General Physics, Theory-Hep,Hepth, Physics, 500, FOS: Physical sciences, 530, Cosmological Constant, Cosmology, Scalar Fields, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Supersymmetry Theory-Hep,Hepth, High Energy Physics - Theory (hep-th), 71 Classical And Quantum Mechanics
Compactification, High Energy Physics - Theory, General Physics, Theory-Hep,Hepth, Physics, 500, FOS: Physical sciences, 530, Cosmological Constant, Cosmology, Scalar Fields, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Supersymmetry Theory-Hep,Hepth, High Energy Physics - Theory (hep-th), 71 Classical And Quantum Mechanics
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