Experimental hints of gravity in large extra dimensions?

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Recent conjectures suggest the universe may have large extra dimensions, through which gravity propagates. This implies gross departures from Newton's law of gravity at small length scales. Here I consider some implications for particle dynamics on scales comparable to the compactification radius, Rc ≲ 1 mm. During planet formation, coalescence of micron sized dust grains to planetesimals is a rate critical step. Blum et al. (2000) found dust grain aggregates form low fractal dimension structures in microgravity, consistent with high angular momentum coalescence. I consider the effects of non-Newtonian gravity on dust aggregation on scales less than Rc and show they naturally coalesce into low-dimensional structures with high specific angular momentum. We infer Rc ≈ 80 microns.

Original languageEnglish (US)
Pages (from-to)781-784
Number of pages4
JournalInternational Journal of Modern Physics D
Issue number6
StatePublished - Dec 2001

All Science Journal Classification (ASJC) codes

  • Mathematical Physics
  • Astronomy and Astrophysics
  • Space and Planetary Science


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