Computer Science
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jhw..confe...9k&link_type=abstract
Proceedings of the 29th Johns Hopkins Workshop on current problems in particle theory: strong matter in the heavens. 1-3 August,
Computer Science
Scientific paper
Bosonic string formation in gauge theories is reviewed with focus on the confining flux in lattice QCD and its string theory description. Recent results on the Casimir energy of the flux ground state and the string excitation spectrum are analyzed in the Dirichlet string limit of large separation between static sources. The closed string-soliton (torelon) with electric flux winding around a compact dimension and the three-string with a Y-junction created by three static sources are also reviewed. It is shown that string spectra from lattice simulations are consistent with universal predictions of the leading operators from the derivative expansion of a Poincare invariant effective string Lagrangian with reparameterization symmetry. Important characterisitics of the confining flux, like stiffness and the related massive breather modes, are coded in operators with higher derivatives and their determination remains a difficult challenge for lattice gauge theory.
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