Compactifications and BPS States
As remarkable as these dualities may appear, we can still question whether they are accidents of our low-energy expansions or represent something deeper about the theory. We must establish other consistency checks on these nonperturbative results. Perhaps the most persuasive evidence comes from something called “BPS saturated states,” which allow us to probe nonperturbative phenomena because of the nonrenormalization theorems. In this chapter, we will see show these BPS saturated states allow us to establish a web of dualities in dimensions down to D = 4.
KeywordsModulus Space Scalar Field Gauge Field Magnetic Charge Heterotic String
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