# Fluctuating string in AdS black hole

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People frequently use fluctuating string in AdS black hole (see 1,2,3 etc) to study dynamics of a "free external quark" in quark-gluon-plasma (QGP) at finite temperature. The background black hole geometry induces a black hole in the string world sheet. Many interesting results about the boundary theory can be obtained, at least qualitatively, just studying the Nambu-Goto action.

My question is : Why do people usually choose just one of the transverse spatial directions along which the world sheet can fluctuate? Suppose there is a background magnetic field in addition. Shouldn't one need at least two spatial directions for the world sheet to fluctuate to observe/study its effect on the "quark"?

This post imported from StackExchange Physics at 2015-11-09 19:45 (UTC), posted by SE-user pinu
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