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Submission + - Extra dimensions? Only if smaller than 3*10^-6 m!

Vincenzo Romano writes: The website of the fortnightly scientific magazine Science News is reporting today an interesting article about the maximum size of any extra dimension, if any.
A team of theoretical physicists and astronomers has calculated that any hidden extra dimension beyond our familiar three-dimensional space, a world known in physics parlance as a 3-brane, must be less than 3 micrometers.
The study has been submitted online by Oleg Gnedin, Assistant Professor of Astronomy at the College of Literature, Science, and the Arts of the Univesrity of Michigan and is based on observations on one of the oldest black holes ever found in our universe, lurking deep inside the NGC 4472 galaxy.
Basically, that black hole has not evaporated yet by the Hawking radiation on the predicted "short" short timescale, thus posing an upper limit to the size of any extra dimensions to less thab 0.003 mm.
So what? String theorists must buy better magnifying lenses if they want to prove to be right.
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Extra dimensions? Only if smaller than 3*10^-6 m!

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