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Opening up extra dimensions at ultralarge scales

, : Opening up extra dimensions at ultralarge scales. Physical Review Letters 84(26 Pt 1): 5928-5931

The standard picture of viable higher-dimensional theories is that direct manifestations of extra dimensions occur at short distances only, whereas long-distance physics is effectively four-dimensional. We show that this is not necessarily true in models with infinite extra dimensions. As an example, we consider a five-dimensional scenario with three 3-branes in which gravity is five dimensional at both short- and very long-distance scales, with conventional four-dimensional gravity operating at intermediate length scales. A phenomenologically acceptable range of validity of four-dimensional gravity extending from microscopic to cosmological scales is obtained without strong fine-tuning of parameters.


PMID: 10991091

DOI: 10.1103/PhysRevLett.84.5928

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