Abstract
We suggest a braneless scenario that still hides large-volume extra dimensions. Ordinarily the strength of bulk gauge interactions would be diluted over the large internal volume, making all the four-dimensional forces weak. We use the fact that if the gauge fields result from the dimensional reduction of pure higher-dimensional gravity, then the strengths of the four-dimensional gauge interactions are related to the sizes of corresponding cycles averaged over the compact internal manifold. Therefore, if a gauge force is concentrated over a small cycle it will not be diluted over the entire manifold. Gravity, however, remains diluted over the large volume. Thus large-volume, large mass-gap extra dimensions with small cycles can remain hidden and result in a hierarchy between gravity and the other forces. However, problematically, the cycles are required to be smaller than the higher-dimensional Planck length and this raises concern over quantum gravity corrections. We speculate on possible cures.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 326-330 |
| Number of pages | 5 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 713 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jul 9 2012 |
| Externally published | Yes |
Bibliographical note
Funding Information:We thank Gregory Gabadadze, Brian Greene, Daniel Kabat, David Kagan, Alberto Nicolis, Massimo Porrati, and Dylan Thurston for invaluable conversations. KH acknowledges support from NASA ATP grant NNX08AH27G , NSF grant PHY-0930521 , DOE grant DE-FG05-95ER40893-A020 and the University of Pennsylvania . JL acknowledges support from an NSF Theoretical Physics grant, PHY-0758022 . JL also gratefully acknowledges a KITP Scholarship.
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