Quantum resolution of black hole singularities

We study the classical and quantum theory of spherically symmetric spacetimes with scalar field coupling in general relativity. We utilise the canonical formalism of geometrodynamics adapted to the Painleve-Gullstrand coordinates, and present a new quantisation of the resulting field theory. We give an explicit construction of operators that capture curvature properties of the spacetime and use these to show that the black hole curvature singularity is avoided in the quantum theory.Comment: 5 pages, version to appear in CQ

Efektivitas Promotion Mix terhadap Keputusan Wali Murid Memilih SMA IT Pesantren Nururrahman

This research aim was to obtain empirical evidence and analyzing the effectiveness of promotional mix on decision parents in choosing a school. The research type was causality using survey approach. The population of this research was candidate parents who purchased the form registering student new admission (PPDB) in school year of 2016/2017 as many as 217 people. The number of samples was counted 69 peoples. Data was collected through observation and questionnaire-based. The data analysis method used structural equation model based on regression variance with partial least square approach. The results of this research indicated that only word-of mouth marketing components of promotional mix had significant effect to the decision parent. Promotional mix was started from advertising to establish brand awareness, public relations and direct marketing activities to shape consumer behavior, the role of word-of mouth marketing and terminate in personal selling activities to determine purchase decisions

General covariance, and supersymmetry without supersymmetry

An unusual four-dimensional generally covariant and supersymmetric SU(2) gauge theory is described. The theory has propagating degrees of freedom, and is invariant under a local (left-handed) chiral supersymmetry, which is half the supersymmetry of supergravity. The Hamiltonian 3+1 decomposition of the theory reveals the remarkable feature that the local supersymmetry is a consequence of Yang-Mills symmetry, in a manner reminiscent of how general coordinate invariance in Chern-Simons theory is a consequence of Yang-Mills symmetry. It is possible to write down an infinite number of conserved currents, which strongly suggests that the theory is classically integrable. A possible scheme for non-perturbative quantization is outlined. This utilizes ideas that have been developed and applied recently to the problem of quantizing gravity.Comment: 17 pages, RevTeX, two minor errors correcte

Two dimensional general covariance from three dimensions

A 3d generally covariant field theory having some unusual properties is described. The theory has a degenerate 3-metric which effectively makes it a 2d field theory in disguise. For 2-manifolds without boundary, it has an infinite number of conserved charges that are associated with graphs in two dimensions and the Poisson algebra of the charges is closed. For 2-manifolds with boundary there are additional observables that have a Kac-Moody Poisson algebra. It is further shown that the theory is classically integrable and the general solution of the equations of motion is given. The quantum theory is described using Dirac quantization, and it is shown that there are quantum states associated with graphs in two dimensions.Comment: 10 pages (Latex), Alberta-Thy-19-9

On Singularity Resolution in Quantum Gravity

We examine the singularity resolution issue in quantum gravity by studying a new quantization of standard Friedmann-Robertson-Walker geometrodynamics. The quantization procedure is inspired by the loop quantum gravity programme, and is based on an alternative to the Schr\"odinger representation normally used in metric variable quantum cosmology. We show that in this representation for quantum geometrodynamics there exists a densely defined inverse scale factor operator, and that the Hamiltonian constraint acts as a difference operator on the basis states. We find that the cosmological singularity is avoided in the quantum dynamics. We discuss these results with a view to identifying the criteria that constitute "singularity resolution" in quantum gravity.Comment: 12 page

Solutions in Self-Dual Gravity Constructed Via Chiral Equations

The chiral model for self-dual gravity given by Husain in the context of the chiral equations approach is discussed. A Lie algebra corresponding to a finite dimensional subgroup of the group of symplectic diffeomorphisms is found, and then use for expanding the Lie algebra valued connections associated with the chiral model. The self-dual metric can be explicitly given in terms of harmonic maps and in terms of a basis of this subalgebra.Comment: Plain Latex, 13 Pages, major revisions of style in the above proof, several Comments added. Version to appear in Physical Review

An Investigation of the Effects of Categorization and Discrimination Training on Auditory Perceptual Space

Psychophysical phenomena such as categorical perception and the perceptual magnet effect indicate that our auditory perceptual spaces are warped for some stimuli. This paper investigates the effects of two different kinds of training on auditory perceptual space. It is first shown that categorization training, in which subjects learn to identify stimuli within a particular frequency range as members of the same category, can lead to a decrease in sensitivity to stimuli in that category. This phenomenon is an example of acquired similarity and apparently has not been previously demonstrated for a category-relevant dimension. Discrimination training with the same set of stimuli was shown to have the opposite effect: subjects became more sensitive to differences in the stimuli presented during training. Further experiments investigated some of the conditions that are necessary to generate the acquired similarity found in the first experiment. The results of these experiments are used to evaluate two neural network models of the perceptual magnet effect. These models, in combination with our experimental results, are used to generate an experimentally testable hypothesis concerning changes in the brain's auditory maps under different training conditions.Alfred P. Sloan Foundation and the National institutes of Deafness and other Communication Disorders (R29 02852); Air Force Office of Scientific Research (F49620-98-1-0108

Praktik Manajemen Laba: Studi Komparasi pada Perusahaan-Perusahaan yang Melakukan IPO Tahun 2012-2016

This research was aimed to obtain empirical evidence about the practice of earnings management between companies in manufacturing industry and financial sectors listed in Indonesian Stock Exchange. This study adopted measurement of earnings management based on conditional revenue model approach. The population in this research was 41 manufacturing companies and financial sectors listed in Indonesian Stock Exchange to conduct an initial public offerings (IPO) in 2012-2016. The sampling technique was purposive method. The sample in this research establishment was 16 manufacturing industry and 22 financial sectors companies. The data analysis method using independent-samples t test, did the normality and homogenity test previously and hypothesis testing with mann-whitney test approach. The hypothesis testing results indicated that there is no significant difference between manufacturing industry and financial sectors who conduct an IPO in 2012-2016 to the practice of earnings management

Rasio Keuangan: Studi Komparasi Pada Perusahaan Industri Manufaktur dan Sektor Jasa Yang Melakukan Initial Public Offerings (IPO) Tahun 2018

Tujuan dari penelitian ini adalah untuk menjelaskan bagaimana signifikansi perbedaan rasio keuangan perusahaan industri manufaktur dan sektor jasa yang melakukan initial public offerings (IPO) tahun 2018. Rasio keuangan menggunakan 5 (lima) pengukuran yaitu rasio likuiditas, rasio aktivitas, rasio solvabilitas, rasio profitabilitas dan rasio prospek pasar dengan masing-masing proksi current ratio, total asset turnover, debt-to equity ratio, return on assets dan price-to book value. Sampel penelitian melibatkan 32 perusahaan yang diperoleh melalui metode purposive sampling. Metode analisis data menggunakan uji statistik dengan teknik Independent Sample T-Test dan Mann Whitney Test. Hasil penelitian menunjukkan bahwa rasio likuiditas, rasio solvabilitas dan rasio prospek pasar perusahaan industri manufaktur dan sektor jasa memiliki perbedaan yang signifikan sedangkan rasio aktivitas dan profitabilitas tidak memiliki perbedaan yang signifikan.This research aim to explains how the significance of differences financial ratio's in manufacturing industry and service sectors company who do the initial public offerings (IPO) in 2018. Financial ratio's using 5 (five) measurements i.e. liquidity ratios, activity ratios, solvency ratios, profitability ratios and market prospect ratios with each current ratio, total asset turnover, debt-to equity ratio, return on assets and price-to-book value. The research sample involved 32 companies that were obtained through a purposive sampling method. The methods analysis uses statistical tests with the Independent Sample T-Test and Mann Whitney Test techniques. The results showed that the liquidity ratios, solvency ratios and market prospect ratios of the manufacturing industry and services sector have a significant differences while the activity ratios and profitability ratios didn't have significant differences