250 research outputs found
Homotopy, monopoles and 't Hooft tensor in QCD with generic gauge group
We study monopoles and corresponding 't Hooft tensor in QCD with a generic
compact gauge group. This issue is relevant to the understanding of color
confinement in terms of dual symmetry.Comment: 15 pages. Accepted for publication in JHE
't Hooft tensor for generic gauge group
We study monopoles in gauge theories with generic gauge group. Magnetic
charges are in one-to-one correspondence with the second homotopy classes at
spatial infinity (), which are therefore identified by the 't Hooft
tensor. We determine the 't Hooft tensor in the general case. These issues are
relevant to the understanding of Color Confinement.Comment: 5 pages. Contribution to the Conference QCD08, Montpellier 7-12 July
2008 To appear in the proceeding
Effect of the dispersion of the chromophore on the optical performances of polarizers from polyethylene and 5”-thio-(3-butyl)nonyl-2,2’:5’,2”-terthiophene
A new polyethylene-compatible terthiophene chromophore, 5"-thio-(3-butyl) nonyl-2,2':5',2"-terthiophene, with melting point lower than 0degreesC was prepared and used for linear polarizers based on ultra-high-molecular-weight polyethylene (UHMWPE). Differential scanning calorimetry and scanning electron microscopy indicate that the new chromophore is dispersed uniformly in films of UHMWPE obtained by casting from solution. The films show excellent dichroic properties (dichroic ratio 30) at rather low drawing ratio (approximate to20). Moreover, qualitative agreement is observed with the Ward pseudo-affine deformation schem
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