Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-11-08
PoSLAT2005:001,2006; PoSJHW2005:009,2006
Physics
High Energy Physics
High Energy Physics - Lattice
22 pages, 15 figures, plenary talk at LATTICE 2005, Trinity College, Dublin, July 25-30, 2005. Reference typos corrected
Scientific paper
10.1142/S0217751X06031910
Bosonic string formation in gauge theories is reviewed with particular attention to the confining flux in lattice QCD and its string theory description. Recent results on the Casimir energy of the 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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