Sizes of Lightest Glueballs in SU(3) Lattice Gauge Theory

Standard Monte Carlo simulations have been performed on improved lattices to measure the wave functions and sizes of the scalar and tensor glueballs at four lattice spacings in the range $a= 0.05 - 0.145$ fm. Systematic errors from discretization and finite volume are studied. Our results in the continuum limit show that the size of the tensor state is approximately two times as large as that of the scalar glueball.Comment: 7 pages, 6 figures. Accepted for publication. To appear in Prog. Theor. Phys. Vol. 116, No. 1 (2006

Entropy Density and Speed of Sound from Improved Energy-Momentum Tensor in Lattice QCD

We present a lattice calculation of the entropy density $s/T^{3}$ and speed of sound $c_{s}^{2}$ of gluedynamics near the critical temperature, $T_{c}$, in the deconfined phase. By exploring the temperature dependence of entropy density in this region, we aim to analyse the significant discrepancies between the previous computations. The calculation of entropy density is carried out by numerical simulations of $O(a^{4})$ mean-field improved energy-momentum tensor (EMT) of SU(3) gauge theory on the lattice. We expand on reaching $O(a^{4})$ improvement using tadpole-improved Symanzik action. The entropy density is calculated directly from the expectation value of the space-time component of the improved EMT in the presence of shifted boundary conditions at several lattice spacings ($a \approx 0.043 - 0.012$ fm). The absence of ultraviolet divergences and the minimal finite-size effects allow for the precision determination of the entropy density and its extrapolation to the continuum limit. As expected, the resulting entropy density displays the expected behaviour of rapid increase near the critical temperature in the deconfined phase followed by a slow increase in $2T_{c}\leq T\leq 3T_{c}$ region, suggesting a logarithmic dependence on the temperature. A quantitative comparison of $s/T^{3}$ shows good agreement with Pade approximation and lattice results of previous high-precision data obtained using the gradient flow method. We observe that at temperatures of about $3T_{c}$, deviations of entropy density from the Stefan-Boltzmann value for a free theory are about 10$\%$. It is shown that the speed of sound in SU(3) gluedynamics is found to be $c_{s}^{2}\leq 0.333$ in the temperature region $1.06T_{c}\leq T\leq 3.05T_{c}$ explored in this study. The results are found to agree with the corresponding analytic and numerical estimates.Comment: 7 pages, 5 figure

Research Productivity of India and Iran in Stomach Cancer: A Bibliometric Study

The study aims to provide an insight into the global research productivity in stomach cancer with an in-depth analysis of the growth & development of India and Iran. The study focuses on the authorship collaborative patterns among Indian and Iranian medical scientists as well. The study was conceived with the selection of terms on “Stomach cancer”. The terms- “Stomach Cancer, Stomach Neoplasm, Gastric Cancer, and Gastric Neoplasm” were selected from the Medical Subject Headings (MeSH) to retrieve the data from the Web of Science (WoS). The Boolean Operator “OR” was executed to retrieve the records. The data was retrieved from 1989-2017 and downloaded in the excel file after restricting the country to India and Iran. Later, Microsoft Excel and STATA software were used to analyze the data. Three important means- annual growth rate (AGR), relative growth rate (RGR), and Doubling Time (DT) have been used to trace the development of literature. Further, authorship patterns were analyzed using the authorship collaboration and collaborative coefficient methods. The findings of the study show that Japan has the highest contribution (16,616; 19.89%) followed by the USA (16,195; 19.38%) and China (15,683; 18.768%) respectively in the field of Stomach Cancer research. India stands at 15th position and Iran at 22thposition with 1104 (1.32%) and 718 (0.86%) publications respectively. The annual growth rate of India and Iran is slow in the onset as compared to the later years, which is a positive sign of the improvement in the research productivity. The collaborative patterns show that medical scientists prefer to work in collaboration

Lung Cancer Research in India and Iran: A Scientometric Study

The study aims to provide global research productivity on lung cancer with an in-depth analysis of the growth & development of India and Iran. The study focuses on the authorship collaborative patterns among Indian and Iranian medical scientists as well. The research started with the selection of terms on “Lung cancer”. Three terms- Lung Cancer, Lung Neoplasm, and Pulmonary Neoplasm were selected from the Medical Subject Headings (MeSH) to retrieve the data from the Web of Science (WoS). The Boolean Operator “OR” was executed to retrieve the records. The data related to Lung cancer research from 1989-2017 was retrieved and downloaded in the excel file after restricting the country to India and Iran. Later, Microsoft Excel, STATA, and EViews software were used to analyze the data. Three important means- annual growth rate (AGR), relative growth rate (RGR), and Doubling Time (DT) have been used to trace the development of literature from 1989 to 2017. Further, authorship patterns were analyzed using the authorship collaboration and collaborative coefficient methods. The findings of the study show that there is a strong and considerable relationship between the Gross Domestic Production (GDP) of nations and publication productivity. The annual growth rate is slow in the onset as compared to the later years, which is a positive sign of the improvement in the research productivity of India and Iran while as relative growth rate shows a decrease, doubling time shows an increasing trend in both nations towards the end of 2017. Authors prefer to work in collaboration rather than individually