Composite Fermions and the Fractional Quantum Hall Effect: Essential Role of the Pseudopotential

The mean field (MF) composite Fermion (CF) picture successfully predicts the band of low lying angular momentum multiplets of fractional quantum Hall systems for any value of the magnetic field. This success cannot be attributed to a cancellation between Coulomb and Chern--Simons interactions between fluctuations beyond the mean field. It results instead from the short range behavior of the Coulomb pseudopotential in the lowest Landau level (LL). The class of pseudopotentials for which the MFCF picture is successful can be defined, and used to explain the success or failure of the picture in different cases (e.g. excited LL's, charged magneto-excitons, and Laughlin quasiparticles in a CF hierarchy picture).Comment: 4 pages, 4 figures (RevTeX+epsf); talk at EP2DS-XII

Micromechanical Analysis on the Failure Criterion of Ductile Material

AbstractBased on finite element simulation, the void growth behavior in a 3D cell model subjected to low stress triaxiality was studied. The distribution rule of stress-strain near the void was investigated, as well as the developing trend of volume of void. The analysis results indicated that it is not appropriate to regard void volume fraction as a damage parameter under the low stress triaxiality condition. Further research was carried out to verify the reliability of the fracture strain as element failure criterion by comparing the uniaxial tension simulation and experiment results. More studies were conducted to analyze the void growth under low stress triaxiality by introducing the critical equivalent plastic strain as the material failure parameter

Implicit egoism in sentencing decisions: first letter name effects with randomly assigned defendants

Implicit egotism—in particular, positive unconscious associations that individuals have with others who share their names or first initials—is a mainstay of modern psychology textbooks, but the interpretation of prior field studies has recently come under criticism for lack of adequate control, reverse causality, and ethnic heterogeneity. Using unique data from the New Orleans District Attorney’s Office on 48,988 defendants that were randomly assigned to judges from 1988-1999, we identify the causal effect of matching first initials. In contrast to positive affect, we find that judges assign 8% longer sentences on average (about two-three months) when they match on first initials. The effect is robust to controls and removal of outliers. No effect is found for second-letter matches, last-letter matches, or randomly reassigned names. The effects are somewhat larger for defendants categorized as Negroes by the New Orleans District Attorney’s Office, which could be due to sampling variation or due to behavioral biases playing a stronger role in evaluations when decision makers are nearly indifferent. The effects are also somewhat larger for judges categorized as Whites. The negative effect of sharing first initials explains 0.03% of variation. Finally, we interpret the negative behavioral effect as threatened egotism, in which individuals motivated to manage self-image (implicit egoism) create social distance from negatively- valenced targets perceived to be associated with the self

Absorption cross section in warped AdS_3 black hole revisited

We investigate the absorption cross section for minimal-coupled scalars in the warped AdS_3 black hole. According to our calculation, the cross section reduces to the horizon area in the low energy limit as usually expected in contrast to what was previously found. We also calculate the greybody factor and find that the effective temperatures for the two chiral CFT's are consistent with that derived from the quasinormal modes. Observing the conjectured warped AdS/CFT correspondence, we suspect that a specific sector of the CFT operators with the desired conformal dimension could be responsible for the peculiar thermal behaviour of the warped AdS_3 black hole.Comment: 16+1 pages, typos corrected, references and footnotes adde

From ‘Cinderella’ to ‘Beloved Princess’: The Evolution of Early Childhood Education Policy in China

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The Footprint of F-theory at the LHC

Recent work has shown that compactifications of F-theory provide a potentially attractive phenomenological scenario. The low energy characteristics of F-theory GUTs consist of a deformation away from a minimal gauge mediation scenario with a high messenger scale. The soft scalar masses of the theory are all shifted by a stringy effect which survives to low energies. This effect can range from 0 GeV up to ~ 500 GeV. In this paper we study potential collider signatures of F-theory GUTs, focussing in particular on ways to distinguish this class of models from other theories with an MSSM spectrum. To accomplish this, we have adapted the general footprint method developed recently for distinguishing broad classes of string vacua to the specific case of F-theory GUTs. We show that with only 5 fb^(-1) of simulated LHC data, it is possible to distinguish many mSUGRA models and low messenger scale gauge mediation models from F-theory GUTs. Moreover, we find that at 5 fb^(-1), the stringy deformation away from minimal gauge mediation produces observable consequences which can also be detected to a level of order ~ +/- 80 GeV. In this way, it is possible to distinguish between models with a large and small stringy deformation. At 50 fb^(-1), this improves to ~ +/- 10 GeV.Comment: 85 pages, 37 figure