X iv : a st ro - p h / 01 07 16 9 v 1 9 J ul 2 00 1 Experimental hints of Gravity in Large Extra Dimensions ? ∗
نویسنده
چکیده
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. ∗This essay received an ”honorable mention” in the 2001 Essay Competition of the Gravity Re-
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تاریخ انتشار 2001