More on Phase Transition and Renyi Entropy

In this paper, we study the scalar field condensation around the hyperbolic black hole solutions in the Einstein and Gauss-Bonnet gravities. We investigate the Renyi entropy and inequalities governing on it under this phase transition. Our numerical computations show that for the positive values of the Gauss-Bonnet coupling and below a critical temperature one of these inequalities is violated. This puts more restrictions on the allowed values of the Gauss-Bonnet coupling.Comment: 27 pages, 12 figures. v2: published versio

Holographic complexity in general quadratic curvature theory of gravity

In the context of CA conjecture for holographic complexity, we study the action growth rate at late time approximation for general quadratic curvature theory of gravity. We show how the Lloyd's bound saturates for charged and neutral black hole solutions. We observe that a second singular point may modify the action growth rate to a value other than the Lloyd's bound. Moreover, we find the universal terms that appear in the divergent part of complexity from computing the bulk and joint terms on a regulated WDW patch.Comment: 19 pages, 4 figures; v3. Subsection 2.5 modified and more discussions on the second singularity in new subsection 2.6 added. Accepted for publication in EPJ

Compact Binary Merger Rate in Dark-Matter Spikes

Nowadays, the existence of supermassive black holes (SMBHs) in the center of galactic halos is almost confirmed. An extremely dense region referred to as dark-matter spike is expected to form around central SMBHs as they grow and evolve adiabatically. In this work, we calculate the merger rate of compact binaries in dark-matter spikes while considering halo models with spherical and ellipsoidal collapses. Our findings exhibit that ellipsoidal-collapse dark matter halo models can potentially yield the enhancement of the merger rate of compact binaries. Finally, our results confirm that the merger rate of primordial black hole binaries is consistent with the results estimated by the LIGO-Virgo detectors, while such results can not be realized for primordial black hole-neutron star binaries.Comment: 13 pages; 5 figures; references added, typos were fixe

Trend of cigarette smoking in Iranian adult population from 2000 to 2011 based on four national surveys

Background: Tobacco smoking has been a major health concern for many years. People's awareness of the potential health hazards and government policies might change its pattern and prevalence of use. In order to monitor its conversion, determining the overall pattern of tobacco use and trend analyses would be crucial, which were aimed in the present study. Methods: Patterns of smoking in four national surveys conducted in years 2000, 2005, 2007, and 2011 with 33300, 89337, 5287, and 8837 participants, respectively, were assessed. Current status of cigarette, pipe and water-pipe smoking, the number of cigarettes used per day, and the age of smoking initiation were major parameters. After weighting based on province, residential area, gender, and age group, trend analysis was done through complex samples general linear model using IBM SPSS Statistics for Windows, Version 20.0. The values in the first survey (2000) were considered as reference points and categories. Results: While current cigarette smoking prevalence has been decreased (13.5% in 2000 to 11.3% in 2011) P<0.001, the average of pack-years increased. There was no significant decline in the mean age of initiation. It is also true for the prevalence of pipe and water-pipe smoking, which showed no noticeable difference compared to 2000. Conclusion: According to our findings it seems that health policy makers should focus more on designing programs targeting water-pipe consumption and also pay attention to the trends among subgroups for tailoring policies and scheme implementation

Distributions of High-Sensitivity C-Reactive Protein, Total Cholesterol-HDL Ratio and 10-Year Cardiovascular Risk: National Population-Based Study

The present study aimed to evaluate the distributions of High-Sensitivity C-reactive protein, TC-HDL ratio and 10-year risk of cardiovascular diseases among Iranian adult population. We conducted a cross-sectional study on a total of 2125 adults aged 25 to 65. Data of the Third National Surveillance of Risk Factors of Non-Communicable Diseases (SuRFNCD-2007) was used. Anthropometric indices, blood pressure and biochemical measurements had been obtained. Ten-year risk of cardiovascular events was also calculated using different models. Median (interquartile range) and geometric means (95% CI) of hs-CRP were 5.1(3.9) and 4.1(4.38-4.85), respectively. Mean TC-HDL ratio±(SD) was 5.94±2.84 in men and 5.37±1.97 in women (P<0.001). In spite of risk scores (FRS and SCORE), no significant gender and age-related differences were observed in hs-CRP levels. Exclusion of CRP levels≥10 did not change the results. The proportion of high-risk categories using SCORE and FRS models were 3.6 % and 8.8 %, respectively. In comparison with other published data, greater means and median values of High-Sensitivity C-reactive protein were observed. Higher TC-HDL ratio and cardiovascular risk in men than in women were also demonstrated. The issue of screening for cardiovascular diseases has yet to be addressed due to considerable prevalence of elevated CRP and increased risk of cardiovascular events among various subgroups