2,639 research outputs found
Wilson Loops for a quark anti-quark pair in D3-brane space
We calculate static Wilson loops for a heavy quark anti-quark pair in
different positions in the space generated by a large number of coincident
D3-branes. Simple results are obtained from limiting cases of the geodesic
shape. In particular, quark anti-quark static potentials for flat and AdS
spaces are reproduced.Comment: Revised version published in JHE
Gauge/string duality and hadronic physics
We review some recent results on phenomenological approaches to strong
interactions inspired in gauge/string duality. In particular, we discuss how
such models lead to very good estimates for hadronic masses.Comment: 5pages, talk presented in I Latin American Workshop on High Energy
Phenomenology, Porto Alegre, Brazil, December 2005, to appear in the
proceeding
Remarks on gauge fixing and BRST quantization of noncommutative gauge theories
We consider the BRST gauge fixing procedure of the noncommutative Yang-Mills
theory and of the gauged U(N) Proca model. An extended Seiberg-Witten map
involving ghosts, antighosts and auxiliary fields for non Abelian gauge
theories is studied. We find that the extended map behaves differently for
these models. For the Yang-Mills theory in the Lorentz gauge it was not
possible to find a map that relates the gauge conditions in the noncommutative
and ordinary theories. For the gauged Proca model we found a particular map
relating the unitary gauge fixings in both formulations.Comment: 8 pages, no figures. In this revised version, we included the
explicit Seiberg Witten maps for antighost and auxiliary fields. We used this
expressions to show that it is not possible to relate the Lorentz gauge in
noncommutative and ordinary YM theories by the SW map, as claimed in the
previous versio
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