252,487 research outputs found
A Strategy to Study Confinement in QCD
The order and the universality class of the deconfining phase transition can
provide insight into the mechanism of color confinement, in particular for
N_f=2. The mechanism of confinement by monopole condensation is reviewed.Comment: Presented at IRQCD '06 UERJ Rio de Janeiro (Brasil) 5-9 June 2006. 6
pages, 3 figure
Ultrarelativistic electron states in a general background electromagnetic field
The feasibility of obtaining exact analytical results in the realm of QED in
the presence of a background electromagnetic field is almost exclusively
limited to a few tractable cases, where the Dirac equation in the corresponding
background field can be solved analytically. This circumstance has restricted,
in particular, the theoretical analysis of QED processes in intense laser
fields to within the plane-wave approximation even at those high intensities,
achievable experimentally only by tightly focusing the laser energy in space.
Here, within the Wentzel-Kramers-Brillouin (WKB) or eikonal approximation, we
construct analytically single-particle electron states in the presence of a
background electromagnetic field of general space-time structure in the
realistic assumption that the initial energy of the electron is the largest
dynamical energy scale in the problem. The relatively compact expression of
these states opens, in particular, the possibility of investigating
analytically strong-field QED processes in the presence of spatially focused
laser beams, which is of particular relevance in view of the upcoming
experimental campaigns in this field.Comment: 7 pages, 1 figur
Investigating QCD Vacuum on the lattice
Investigations on the structure of QCD vacuum from first principles can be
done on the lattice. The mechanism of confinement is an example: results from
lattice on it are reviewed.Comment: Presented at the International Workshop "Light cone physics:
Particles and Strings", Trento september 2001. To appear in the Proceeding
Confinement of Color: Recent Progress
Recent progress done in Pisa on the subject is presented. It is shown that
dual superconductivity of the vacuum or absence of it is an intrinsic property
of QCD vacuum, independent of the choice of the abelian projection. The order
of the deconfining phase transition in QCD is studied as a key to
understand the mechanism of confinement.Comment: Talk at Confinement 2003, Tokyo, july 2003, to appear in the
proceedings. 10 pages, 2 figure
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