17,846 research outputs found
Anomaly-corrected supersymmetry algebra and supersymmetric holographic renormalization
We present a systematic approach to supersymmetric holographic
renormalization for a generic 5D gauged supergravity theory
with matter multiplets, including its fermionic sector, with all gauge fields
consistently set to zero. We determine the complete set of supersymmetric local
boundary counterterms, including the finite counterterms that parameterize the
choice of supersymmetric renormalization scheme. This allows us to derive
holographically the superconformal Ward identities of a 4D superconformal field
theory on a generic background, including the Weyl and super-Weyl anomalies.
Moreover, we show that these anomalies satisfy the Wess-Zumino consistency
condition. The super-Weyl anomaly implies that the fermionic operators of the
dual field theory, such as the supercurrent, do not transform as tensors under
rigid supersymmetry on backgrounds that admit a conformal Killing spinor, and
their anticommutator with the conserved supercharge contains anomalous terms.
This property is explicitly checked for a toy model. Finally, using the
anomalous transformation of the supercurrent, we obtain the anomaly-corrected
supersymmetry algebra on curved backgrounds admitting a conformal Killing
spinor.Comment: 51 pages; v2: two references added, typos corrected, a discussion
about the 2-dimensional super-Weyl anomaly added in section
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Category-generation performance in Mandarin-English bilingual children
textResearch has shown that children categorize words in terms of taxonomic and slot-filler strategies. Monolingual children were thought to shift from a slot-filler to taxonomic strategy between the age of five and eight. The aim of this study is to analyze the way Mandarin-English bilingual children organize their lexical-semantic system through the use of a category-generation task that investigate taxonomic and slot-filler organizational strategies in each language. There were 53 Mandarin-English bilingual participants (between 4 and 7 years of age) included in this study. Participants were asked to name as many items as they could think of in slot-filler and taxonomic conditions in English and Mandarin. The results indicate greater performance in English than Mandarin in children who were five years or older. Four-year-old bilingual children produced comparable number of items in both slot-fill and taxonomic condition, but the five-, six-, and seven-year-old bilingual children showed greater performance in the taxonomic condition. Children performed better for the animal than the clothes category, and better for the clothes than the food category. These findings, while largely consistent with existing literature, suggest that the slot-filler to taxonomic shift may take place at an earlier age compared to monolingual children.Communication Sciences and Disorder
Parsimonious Black-Box Adversarial Attacks via Efficient Combinatorial Optimization
Solving for adversarial examples with projected gradient descent has been
demonstrated to be highly effective in fooling the neural network based
classifiers. However, in the black-box setting, the attacker is limited only to
the query access to the network and solving for a successful adversarial
example becomes much more difficult. To this end, recent methods aim at
estimating the true gradient signal based on the input queries but at the cost
of excessive queries. We propose an efficient discrete surrogate to the
optimization problem which does not require estimating the gradient and
consequently becomes free of the first order update hyperparameters to tune.
Our experiments on Cifar-10 and ImageNet show the state of the art black-box
attack performance with significant reduction in the required queries compared
to a number of recently proposed methods. The source code is available at
https://github.com/snu-mllab/parsimonious-blackbox-attack.Comment: Accepted and to appear at ICML 201
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