Effective QCD string beyond Nambu-Goto
arXiv:1403.0893 · doi:10.1103/PhysRevD.89.106010
Abstract
We consider the QCD string as an effective string, whose action describes long-range stringy fluctuations. The leading infrared contribution to the ground state energy is given by the Alvarez-Arvis formula, usually derived using the Nambu-Goto action. Here we rederive it by a saddle point calculation using the Polyakov formulation of the free string, where the world sheet metric and the target space coordinates are treated as independent variables. The next order relevant in the infrared term in the effective action is the extrinsic curvature term. We show that the spectrum does not change order by order in the inverse string length, but may change at intermediate distances.
26pp, v2: to appear in PRD, v3: 1 reference added
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- Scaling behavior of regularized bosonic strings
- Chern-Simons Improved Hamiltonians for Strings in Three Space Dimensions
- Quantum delocalization of strings with boundary action in Yang-Mills theory
- Perturbative width of open rigid strings
- On QCD strings beyond non-interacting model
- Scattering amplitudes of regularized bosonic strings
- Boundary action and profile of effective bosonic strings
- The finite temperature ground state energy of the confining string in three-dimensional U(1) gauge theory
- Strings of diquark-quark (QQ)Q baryon before phase transition
- Intermediate-Distance String Effects in Wilson Loops\\ via Boundary Action
- Comments on open string with "massive" boundary term