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.pdfBut not sure what quantum foam means........
Could somebody kindly explain it to me?