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Can we live in the bulk without a brane?

  • Kurt Hinterbichler
  • , Janna Levin
  • , Claire Zukowski

Research output: Contribution to journalArticlepeer-review

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 languageEnglish (US)
Pages (from-to)326-330
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume713
Issue number3
DOIs
StatePublished - Jul 9 2012
Externally publishedYes

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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