19 research outputs found

    Jet-quenching of the rotating heavy meson in a N{\mathcal{N}}=4 SYM plasma in presence of a constant electric field

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    In this paper, we consider a rotating heavy quark-antiquark (qqˉq\bar{q}) pair in a N{\mathcal{N}}=4 SYM thermal plasma. We assume that qqˉq\bar{q} center of mass moves at the speed vv and furthermore they rotate around the center of mass. We use the AdS/CFT correspondence and consider the effect of external electromagnetic field on the motion of the rotating meson. Then we calculate the jet-quenching parameter corresponding to the rotating meson in the constant electric field

    Color superconductivity, Z_N flux tubes and monopole confinement in deformed N=2* super Yang-Mills theories

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    We study the Z_N flux tubes and monopole confinement in deformed N=2* super Yang-Mills theories. In order to do that we consider an N=4 super Yang-Mills theory with an arbitrary gauge group G and add some N=2, N=1 and N=0 deformation terms. We analyze some possible vacuum solutions and phases of the theory, depending on the deformation terms which are added. In the Coulomb phase for the N=2* theory, G is broken to U(1)^r and the theory has monopole solutions. Then, by adding some deformation terms, the theory passes to the Higgs or color superconducting phase, in which G is broken to its center C_G. In this phase we construct the Z_N flux tubes ansatz and obtain the BPS string tension. We show that the monopole magnetic fluxes are linear integer combinations of the string fluxes and therefore the monopoles can become confined. Then, we obtain a bound for the threshold length of the string-breaking. We also show the possible formation of a confining system with 3 different monopoles for the SU(3) gauge group. Finally we show that the BPS string tensions of the theory satisfy the Casimir scaling law.Comment: 18 pages, 2 figures, typo corrections. Version to appear in Phys. Rev.

    Prevalence of Diabetes, Glycosuria and Related Variables Among a Cape Coloured Population

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    A representative community of Cape Coloured people were surveyed in order to assess the prevalence of diabetes and related variables. The randomly selected sample consisted of 1 534 persons over the age of 10 years, of whom 63% were persuaded to undergo screening by blood-sugar level and testing for glycosuria 1 hour after a 50 g glucose load. The mean blood-sugar values obtained rose with age, were the same in each sex, and were a little higher among the Moslem sub-group. They were higher than those found in other racial groups. Blood-sugar levels did not correlate with body weight or parity. The prevalence of known diabetes at all ages was 1'1% and of 'discovered diabetes' 6'1 %. The total diabetes prevalence over the age of 15 was 8-7%; over the age of 55 it was 25%. There was little difference between the sexes. Diabetes was diagnosed in 7 children of 16 years of age or less, none of whom had symptoms. Symptoms were in fact extremely uncommon at all ages, even with gross hyperglycaemia and fasting glycosuria. In many diabetics, however, glycosuria was absent; urine testing alone pr.oved an unreliable guide to the diagnosis. A family history of diabetes was found in 18% of the whole community and was no higher among the discovered diabetics, but was present in 4 of the 7 juvenile diabetics. Obesity was uncommon among the men in general (7%), but frequent among the women (30%). The discovered diabetics were even fatter, and the young (under 40) diabetics were fatter than the over-40s, a result we have found in other races. We conclude that the Cape Coloured community are remarkably hyperglycaemic (for obscure reasons), and that this hyperglycaemia is rarely associated with symptoms, but importantly associated with vascular disease
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