Boundary fermion currents and subleading order chiral anomaly in the AdS/CFT correspondence

We construct a wave-functional whose argument couples to boundary fermion currents in the AdS/CFT correspondence. Using this we calculate the contributions from bulk fermions to the chiral anomaly that give the subleading order term in the exact $N$-dependence of the chiral anomaly of ${\cal N}=4$ SYM. The result agrees with the calculation of Bilal & Chu.Comment: 6 page

Bound States in the AdS/CFT Correspondence

We consider a massive scalar field theory in anti-de Sitter space, in both minimally and non-minimally coupled cases. We introduce a relevant double-trace perturbation at the boundary, by carefully identifying the correct source and generating functional for the corresponding conformal operator. We show that such relevant double-trace perturbation introduces changes in the coefficients in the boundary terms of the action, which in turn govern the existence of a bound state in the bulk. For instance, we show that the usual action, containing no additional boundary terms, gives rise to a bound state, which can be avoided only through the addition of a proper boundary term. Another notorious example is that of a conformally coupled scalar field, supplemented by a Gibbons-Hawking term, for which there is no associated bound state. In general, in both minimally and non-minimally coupled cases, we explicitly compute the boundary terms which give rise to a bound state, and which ones do not. In the non-minimally coupled case, and when the action is supplemented by a Gibbons-Hawking term, this also fixes allowed values of the coupling coefficient to the metric. We interpret our results as the fact that the requirement to satisfy the Breitenlohner-Freedman bound does not suffice to prevent tachyonic behavior from existing in the bulk, as it must be supplemented by additional conditions on the coefficients in the boundary terms of the action.Comment: 32 pages, Latex. v2: added comments and clarifications, minor changes. v3: corrected wrong result in the non-minimally coupled case, added reference, minor changes. v4: Added new results and discussions, parts of the paper are rewritten. Final version to be published in Phys.Rev.

Incorporating geographic distance into mate preference research: Necessities and luxuries, 2.0

This study (N = 370) examined mate preferences in men and women using the budget allocation paradigm across traits typically studied and the value placed on geographic proximity or propinquity. Importantly, traditionally studied preferences (i.e., physical attractiveness and social status) were seen as priorities, whereas the novel trait of distance was a luxury, suggesting that people were willing to travel to find a partner who satisfies their more important mate preferences. Men valued a short-term mate who was close to them more than women did. Prior work on mate preferences was replicated in their context-specific nature as per evolutionary models of mate choice

Efeito de substrato artificial no enraizamento de estacas de calanchoe (Kalanchoe x blossfeldiana cv. singapur, crassulaceae) Artificial substract effect on the rooting of calanchoe (Kalanchoe x blossfeldiana cv. singapur, crassulaceae) cuttings

Dez misturas artificiais foram estudadas para avaliar o efeito sobre o enraizamento de estacas apicais de Kalanchoe x blossfeldiana cv. Singapur, da família Crassulaceae. Essas misturas foram as seguintes: vermiculita + casca de arroz tostada nas proporções 1:1, 2:1 e 3:1; vermiculita + torta de filtro Oliver nas proporções 1:1, 2:1 e 3:1; vermiculita + turfa da região de Atibaia-SP, nas proporções 1:l, 2:le3:l; vermiculita + casca de pinheiro (mistura comercial). Os melhores resultados foram obtidos com a mistura vermiculita + torta de filtro Oliver em todas as proporções, vermiculita + casca de arroz tostada 3:1 e vermiculita + turfa 3:1. Os piores desempenhos foram os das misturas vermiculita + casca de pinheiro e vermiculita + turfa 1:1.<br>Ten different artificial mixtures were studied as rooting media for Kalanchoe x blossfeldiana cv. Singapur cuttings. They were: vermiculite + toasted rice hulls (1:1, 2:1, 3:1); vermiculite + Oliver filter cake (1:1, 2:1, 3:1); vermiculite + peat (1:1, 2:1, 3:1); and vermiculite + pine bark (commercial mixture). The best results were observed for vermiculite + Oliver filter cake (1:1, 2:1, 3:1), vermiculite + toasted rice hulls (3:1) and vermiculite + peat (3:1). The worst results were observed with vermiculite + pine bark and vermiculite + peat (1:1)