Stability of scalarized charged black holes in the Einstein-Maxwell-Scalar theory

We analyze the stability of scalarized charged black holes in the Einstein-Maxwell-Scalar (EMS) theory with quadratic coupling. These black holes are labelled by the number of $n=0,1,2,\cdots$, where $n=0$ is called the fundamental black hole and $n=1,2,\cdots$ denote the $n$-excited black holes. We show that the $n=0$ black hole is stable against full perturbations, whereas the $n=1,2$ excited black holes are unstable against the $s(l=0)$-mode scalar perturbation. This is consistent with the EMS theory with exponential coupling, but it contrasts to the $n=0$ scalarized black hole in the Einstein-Gauss-Bonnet-Scalar theory with quadratic coupling. This implies that the endpoint of unstable Reissner-Nordstr\"{o}m black holes with $\alpha>8.019$ is the $n=0$ black hole with the same $q$. Furthermore, we study the scalarized charged black holes in the EMS theory with scalar mass $m^2_\phi=\alpha/\beta$.Comment: 23 pages, 11 figures. arXiv admin note: text overlap with arXiv:1812.0360

Instability of small AdS black holes in sixth-order gravity

We investigate the stability analysis of AdS black holes in the higher dimensional sixth-order gravity. This gravity is composed of Ricci cubic gravity and Lee-Wick term. It indicates that the Ricci tensor perturbations exhibit unstable modes for small AdS black holes in Ricci cubic gravity by solving the Lichnerowicz-type linearized equation. We show that the correlated stability conjecture holds for the AdS black hole by computing all thermodynamic quantities in Ricci cubic gravity. Furthermore, we find a newly non-AdS black hole in Ricci cubic gravity by making use of a static eigenfunction of the Lichnerowicz operator.Comment: 27 pages, 4 figures. arXiv admin note: text overlap with arXiv:1801.0462

Instability of Reissner-Nordstr\"{o}m black hole in Einstein-Maxwell-scalar theory

The scalarization of Reissner-Nordstr\"{o}m black holes was recently proposed in the Einstein-Maxwell-scalar theory. Here, we show that the appearance of the scalarized Reissner-Nordstr\"{o}m black hole is closely related to the Gregory-Laflamme instability of the Reissner-Nordstr\"{o}m black hole without scalar hair.Comment: 22 pages, 10 figures, version to appear in EPJ

Export Behavior In 5 ASEAN Countries : An Econometric Investigation

Many previous studies on the behavior of aggregate exports have ignored the simultaneous relationship between quantity and price. In this study, we have taken explicit account of this simultaneity specifying well-defined models of export demand and supply, and by estimating these models simultaneously for five ASEAN countries. The results indicate that export demand relative price elasticities are smaller for the sample of ASEAN5. A positively sloped function of export supply is found to exist for a majority of countries in the sample

Total factor productivity, technology transfer and absorptive capacity in developing Asian countries

Technological progress or total factor productivity (TFP) is the main factor in sustaining economic growth in the long run. As technological follower, technology transfer is the main source of technology progress in developing Asian countries. Effectiveness of technology transfer requires adequate human capabilities to absorb and adapt foreign technological knowledge. This study attempts to study the relative contribution of TFP growth to economic growth and technological absorption of human capital in the technology transfer process by looking into gender aspect at different levels of education. Solow neoclassical growth accounting method is applied to investigate the contribution of TFP growth to economic growth. The logistic technology diffusion model is used to determine the impact of human capital gender on TFP growth through dual dimensions – innovation and technology transfer for a sample of 12 developing Asian countries over the period of 1970 -2009 by using panel data pooled Ordinary Least Square (OLS), fixed/ random effects model. The growth accounting estimation supports the assimilation views that TFP growth has significantly contributed to the output growth of developing Asian countries. The empirical results indicated that the aggregate of female and male educations is significant in the technology transfer process. In terms of gender disaggregate educational levels, female and male tertiary education showed higher absorptive capacity in facilitating technology transfer. The results also showed that autonomous technology transfer has significant impact on TFP growth. This study shows the absorptive capacity of female and higher education in the technology transfer in enhancing the growth of productivity. As such, several policies may be implemented to enhance the effectiveness of technology transfer process by augmenting tertiary education, reducing the gender education disparity, enhancing the rate of female participation in labour force. Sustaining the economic growth which is based on productivity is important at accelerating the economic development of Asian developing countries

Complete denture copy technique—A practical application

AbstractThe copy denture technique is a misnomer for the clinical and laboratory procedures involved in making complete dentures that replicate most of the features of the original prosthesis. The aim is to replicate the good features of an otherwise successful prosthesis that now requires replacement and to alter the poor features and so it is strictly speaking not a copy. There are many purported advantages to this technique which include reduced treatment time, increased patient acceptance especially for the elderly who may not adapt so well to a new prosthesis, maintenance of tooth position and vertical dimension. A typical case is presented illustrating the clinical stages involved with a discussion of the merits of this technique