The Cosmological Constant and the String Landscape
Abstract
Description
Theories of the cosmological constant fall into two classes, those in which the vacuum energy is fixed by the fundamental theory and those in which it is adjustable in some way. For each class we discuss key challenges. The string theory landscape is an example of an adjustment mechanism. We discuss the status of this idea, and future directions.
35 pages, 2 figures. Rapporteur talk at the 23rd Solvay Conference in Physics, December, 2005. v2: Small changes. Author notes that this is not a review article but a discussion of a few specific issues
35 pages, 2 figures. Rapporteur talk at the 23rd Solvay Conference in Physics, December, 2005. v2: Small changes. Author notes that this is not a review article but a discussion of a few specific issues