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- From: marty@amaterasu.physics.uiuc.edu (Marty Gelfand)
- Subject: Re: Link invariants and gauge theory
- References: <24502@galaxy.ucr.edu> <1992Dec21.063339.27448@nuscc.nus.sg>
- Message-ID: <BzMAyM.Du2@news.cso.uiuc.edu>
- Sender: usenet@news.cso.uiuc.edu (Net Noise owner)
- Organization: Department of Physics, University of Illinois at Urbana-Champaign
- Date: Mon, 21 Dec 1992 16:25:33 GMT
- Lines: 28
-
- In article <1992Dec21.063339.27448@nuscc.nus.sg> matmcinn@nuscc.nus.sg (Brett McInnes) writes:
- >baez@guitar.ucr.edu (john baez) writes:
- >[interesting stuff deleted]:
- >:
- >Can anyone
- > [a] give me an example of a theory that is *not* diffeomorphism invariant
- > [b] explain to me whether "real" physicists "really" care about
- >Chern-Simonsology [meaning: do they actually have a concrete use for it,
- >or is it something that people do while waiting for the next theory of
- >everything to come along?]
- At least a few physicists studying the fractional quantum Hall effect
- believe Chern-Simons field theories are relevant to the real world.
- E.g., A. Lopez and E. Fradkin, Phys Rev B 44, 5246 (1991) [chosen because
- it's a local product]. Actually there are several flavors of Chern-Simons
- theories for the FQHE floating around, all of which (one hopes) would
- yield the same results could they be treated exactly.
- > ps I have no objection either to mathematical physics with no obvious
- >applications, or to things like conformal field theory that are
- >interesting but of no real use. Nor am I of the school who say say "so
- >what" when informed of the relationship between knot theory and QFT. I ask
- >merely for information.
- Hey, who says conformal field theory is of no real use??? Down here
- in low-energy physics it has been fruitful in problems such as
- quantum spin chains, multichannel Kondo systems, and 2D finite-temperature
- critical phenomena (including random systems).
-
- Happy Holidays,
- Marty Gelfand marty@amaterasu.physics.uiuc.edu
-