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what is quantum foam?

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yy...@fas.harvard.edu

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Oct 9, 2006, 4:13:10 PM10/9/06
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I see expressions such as quantum gravitational foam, or gravitational
quantum foam, but unsure what they mean. I hear that they are related
to topological strings as well and can be calculated from the process
of melting crystal.
http://xxx.lanl.gov/PS_cache/hep-th/pdf/0312/0312022.pdf
But not sure what quantum foam means........
Could somebody kindly explain it to me?

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