NS5-branes, holography and CFT deformations

A few supergravity solutions representing configurations of NS5-branes admit exact conformal field theory (CFT) description. Deformations of these solutions should be described by exactly marginal operators of the corresponding theories. We briefly review the essentials of these constructions and present, as a new case, the operators responsible for turning on angular momentum.

Transversal politics. Equality and difference in antiracist migrant protest

Transversale Politiken. Gleichheit und Differenz in antirassistischen migrantische Selbst-organisationen - Veronika Siegl Meine Arbeit beschäftigt sich mit transversalen Politiken in antirassistischen migrantischen Selbstorganisationen. Transversale Politik bezeichnet dabei eine Praxis der Zusammen-arbeit, die identitäre Kategorien zu überwinden versucht, aber Unterschiede zwischen einzelnen Personen oder Gruppen dennoch nicht negiert. Ausgangspunkt für meine Forschung ist insofern die Frage, wie MigrantInnen und MehrheitsösterreicherInnen gemeinsam über eine antirassistische Politik diskutieren und diese praktizieren können, ohne durch das Betonen von Differenz oder von Gleichheit rassistische Strukturen zu reproduzieren. Welche Strategien werden entwickelt? Wie wird mit Repräsentationsverhältnissen umgegangen? Gibt es ein kollektives „Wir“? Und: Was kann der Begriff MigrantIn für die politische Arbeit bedeuten? In Bezug auf die Fragen, die in der Ankündigung des Workshops aufgeworfen wurden, kann ich nach meinen Recherchen sagen, dass es in diesem Bereich noch relativ wenig Forschungen gibt. Schon allein zur antirassistischen Bewegung in Österreich gibt es sehr wenig Literatur, zu migrantischen Selbstorganisierungen noch weniger und zu Strategien transversaler Politik eigentlich gar nichts. Fragen der Differenz und Gleichheit werden im Allgemeinen oft nur auf einem sehr abstrakten Niveau geführt, empirische Erfahrungs-berichte, die einen Einblick geben, wie die Theorie in die Praxis umgesetzt werden kann, scheint es sehr wenig zu geben.

On the CFT operator spectrum at large global charge

We calculate the anomalous dimensions of operators with large global charge J in certain strongly coupled conformal field theories in three dimensions, such as the O(2) model and the supersymmetric fixed point with a single chiral superfield and a W = Φ3 superpotential. Working in a 1/J expansion, we find that the large-J sector of both examples is controlled by a conformally invariant effective Lagrangian for a Goldstone boson of the global symmetry. For both these theories, we find that the lowest state with charge J is always a scalar operator whose dimension ΔJ satisfies the sum rule J2ΔJ−(J22+J4+316)ΔJ−1−(J22+J4+316)ΔJ+1=0.04067 up to corrections that vanish at large J . The spectrum of low-lying excited states is also calculable explcitly: for example, the second-lowest primary operator has spin two and dimension ΔJ+3√. In the supersymmetric case, the dimensions of all half-integer-spin operators lie above the dimensions of the integer-spin operators by a gap of order J+12. The propagation speeds of the Goldstone waves and heavy fermions are 12√ and ±12 times the speed of light, respectively. These values, including the negative one, are necessary for the consistent realization of the superconformal symmetry at large J.

The impact of the position effect on the factorial structure of the Culture Fair Test (CFT)

The Culture Fair Test (CFT) is a psychometric test of fluid intelligence consisting of four subtests; Series, Classification, Matrices, and Topographies. The four subtests are only moderately intercorrelated, doubting the notion that they assess the same construct (i.e., fluid intelligence). As an explanation of these low correlations, we investigated the position effect. This effect is assumed to reflect implicit learning during testing. By applying fixed-links modeling to analyze the CFT data of 206 participants, we identified position effects as latent variables in the subtests; Classification, Matrices, and Topographies. These position effects were disentangled from a second set of latent variables representing fluid intelligence inherent in the four subtests. After this separation of position effect and basic fluid intelligence, the latent variables representing basic fluid intelligence in the subtests Series, Matrices, and Topographies could be combined to one common latent variable which was highly correlated with fluid intelligence derived from the subtest Classification (r=.72). Correlations between the three latent variables representing the position effects in the Classification, Matrices, and Topographies subtests ranged from r=.38 to r=.59. The results indicate that all four CFT subtests measure the same construct (i.e., fluid intelligence) but that the position effect confounds the factorial structure