Internal gravity

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Abstract
The dynamics of the internal gravitons in higher-dimensional unified theories is discussed in a general setting. A generalized nonlinear σ model describes the dynamics of the internal metric. It is shown that when the vacuum of the internal space has a nonvanishing curvature the internal gravitons acquire masses comparable to the Planck mass. This implies that, unlike in the five-dimensional case, the internal gravitons will not alter Newton’s gravity (or the low-energy physics in general) in a significant way.