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The discussion centers around identifying the "hottest" topic in physics, exploring various fields and concepts that may be considered significant or trending. Participants mention different areas of research and provide links to external articles for further context.
Participants do not reach a consensus on what the hottest topic in physics is, with multiple competing views presented regarding string theory, nuclear fusion, and carbon nanotubes.
The discussion references a new ranking system based on citation metrics, which may have limitations in terms of how it defines "importance" in scientific fields and does not resolve which topic is definitively the hottest.
Carbon nanotubes are the hottest topic in physics, according to a new way of ranking the popularity of different scientific fields. Nanowires are second, followed by quantum dots, fullerenes, giant magnetoresistance, M-theory and quantum computation. The new ranking has been developed by Michael Banks, a PhD student at the Max Planck Institute for Solid-State Physics in Stuttgart, Germany. He thinks the index could be a quick and simple way of determining the most important subject areas in physics and could even help graduate students choose which field to do their PhD in (physics/0604216).
The new index is based on the "Hirsch index", which was devised last year by Jorge Hirsch of the University of California at San Diego as a way of quantifying the performance of individual scientists. Hirsch's h-index is derived from the number of times that papers by a particular scientist are cited. A scientist with an h-index of 10, say, will have published 10 papers that have received at least 10 citations each. The best researchers should therefore have the highest h-indexes.