Standard Model particles could form small, gravitationally bound 'nuggets' in the ADD model with extra dimensions, and these nuggets could constitute dark matter.
Using Muonic Hydrogen in Optical Spectroscopy Experiment to Detect Extra Dimensions
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Considering that gravitational force might deviate from Newton's inverse-square law (ISL) and become much stronger in small scale, we propose a kind of optical spectroscopy experiment to detect this possible deviation and take electronic, muonic and tauonic hydrogen atoms as examples. This experiment might be used to indirectly detect the deviation of ISL down to nanometer scale and to explore the possibility of three extra dimensions in ADD's model, while current direct gravity tests cannot break through micron scale and go beyond two extra dimensions scenario.
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Microscopic composite systems bound by strong gravity in extra dimensions as candidates for dark matter
Standard Model particles could form small, gravitationally bound 'nuggets' in the ADD model with extra dimensions, and these nuggets could constitute dark matter.