Local and global persistence exponents of two quenched continuous lattice spin models

Local and global persistence exponents associated with zero temperature quenched dynamics of two dimensional XY model and three dimensional Heisenberg model have been estimated using numerical simulations. We have used the method of block persistence to find both global and local exponents simultaneously (in a single simulation). Temperature universality of both the exponents for three dimensional Heisenberg model has been confirmed by simulating the stochastic (with noise) version of the equation of motion. The noise amplitudes added were small enough to retain the dynamics below criticality. In the second part of our work we have studied scaling associated with correlated persistence sites in the three dimensional Heisenberg model in the later stages of the dynamics. The relevant length scale associated with correlated persistent sites was found to behave in a manner similar to the dynamic length scale associated with the phase ordering dynamics.Comment: 20 pages, 7 figure

Anisotropic solution for polytropic stars in 4D Einstein-Gauss-Bonnet gravity

In the present work we have investigated a new anisotropic solution for polytropic star in the framework of $4D$ Einstein-Gauss-Bonnet (EGB) gravity. The possibility of determining the masses and radii of compact stars which puts some limitations on equation of state (EoS) above the nuclear saturation density. For this purpose, the $4D$ EGB field equations are solved by taking a generalized polytropic equation of state (EoS) with Finch-Skea ansatz. The generalized solution for anisotropic model has been tested for different values of Gauss-Bonnet constant $\alpha$ which satisfies all the physical criteria including causality with static stability via mass vs central mass density ($M-\rho_c$), Bondi and Abreu criterion. The adiabatic index shows a minor influence of the GB coupling constant whereas the central and surface redshifts in the EGB gravity always remain lower than the GR. We present the possibility of fitting the mass and radius for some known compact star via $M-R$ curve which satisfies the recent gravitational wave observations from GW 170817 event.Comment: 11 Pages, 10 Figures, 1 Table (to be appeared in EPJC

Beyond income: correlates of conspicuous and luxury consumption in India

Concern about the environmental impacts of consumption has drawn research attention to the drivers of conspicuous and luxury (C/L) consumption. Given the prevailing patterns of overconsumption, most studies to date have focused on countries in the global North. However, an emerging high-consuming middle and upper class in nations such as India and Brazil makes it imperative to extend the study of C/L consumption to these contexts. Research that does exist pertaining to India has predominantly focused only on the role of social identity in driving consumption growth among certain groups. Our study proposes a broader conceptual framework, incorporating a variety of possible factors and applying multivariate statistical analysis to household-expenditure data from the India Human Development Survey. We examine how C/L consumption expenditure is correlated not just with the economic ability to consume (income or wealth) but also with potential socio-psychological drivers and moderators. The results show that while the economic ability to consume (income or its proxy) is an enabling factor, mass-media exposure and social network activity appear to influence C/L consumption positively. Education and caste have more mixed relationships with consumption, and interaction effects between these two variables and economic ability to consume are also significant. The results highlight the importance of socio-psychological factors in shaping consumption decisions beyond the enabling role of income and wealth. Improving understanding of this broader set of factors, as well as their interaction effects, is particularly salient for devising better policies for transitioning toward more sustainable consumption patterns in a large developing country such as India

Decoherence Dynamics of Measurement-Induced Nonlocality and comparison with Geometric Discord for two qubit systems

We check the decoherence dynamics of Measurement-induced Nonlocality(in short, MIN) and compare it with geometric discord for two qubit systems. There are quantum states, on which the action of dephasing channel cannot destroy MIN in finite or infinite time. We check the additive dynamics of MIN on a qubit state under two independent noise. Geometric discord also follows such additive dynamics like quantum discord. We have further compared non-Markovian evolution of MIN and geometric discord under dephasing and amplitude damping noise for pure state and it shows distinct differences between their dynamics.Comment: 11 pages, 10 figures, Revte

Effect of ondansetron on the analgesic efficacy of tramadol used for postoperative analgesia: a randomised controlled study

Background: Ondansetron is used to reduce tramadol induced postoperative nausea and vomiting  (PONV). Studies on patient-controlled analgesia (PCA) found that ondansetron reduces the analgesic  efficacy of tramadol. Drug requirement in PCA and in conventional intravenous analgesia without PCA  device may differ. This study evaluated the effect of ondansetron on analgesic efficacy of tramadol for postoperative analgesia without a PCA device.Methods: A prospective, randomised, placebo-controlled, double-blind parallel group study was  conducted on 126 euthyroid patients of ASA I and II, aged between 30 and 65 years undergoing  hemithyroidectomy under general anaesthesia. Patients were divided into group O and group C. At the time of closure of strap muscles, patients in group O received tramadol 1.5 mg/kg IV and ondansetron 0.1 mg/kg (diluted to 4 ml) IV and those in group C received tramadol 1.5 mg/kg IV and normal saline 4 ml IV. Duration of analgesia, pain score (VAS), PONV and sedation scores were analysed.Results: Duration of analgesia was longer in group C compared with group O (164.1 min vs. 76.3 min, p < 0.05). Postoperative VAS score was higher in group O (p < 0.001). Group C showed higher PONV and sedation score.Conclusion: Ondansetron reduces the duration and quality of analgesia of tramadol administered  conventionally without a PCA device.Keywords: ondansetron, pain, postoperative nausea and vomiting, sedation, tramado

Assessment of a conduction-repolarisation metric to predict Arrhythmogenesis in right ventricular disorders

Background: The re-entry vulnerability index (RVI) is a recently proposed activation-repolarization metric designed to quantify tissue susceptibility to re-entry. This study aimed to test feasibility of an RVI-based algorithm to predict the earliest endocardial activation site of ventricular tachycardia (VT) during electrophysiological studies and occurrence of haemodynamically significant ventricular arrhythmias in follow-up. Methods: Patients with Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC) (n = 11), Brugada Syndrome (BrS) (n = 13) and focal RV outflow tract VT (n = 9) underwent programmed stimulation with unipolar electrograms recorded from a non-contact array in the RV. Results: Lowest values of RVI co-localised with VT earliest activation site in ARVC/BrS but not in focal VT. The distance between region of lowest RVI and site of VT earliest site (D min ) was lower in ARVC/BrS than in focal VT (6.8 ± 6.7 mm vs 26.9 ± 13.3 mm, p = 0.005). ARVC/BrS patients with inducible VT had lower Global-RVI (RVI G ) than those who were non-inducible (−54.9 ± 13.0 ms vs −35.9 ± 8.6 ms, p = 0.005) or those with focal VT (−30.6 ± 11.5 ms, p = 0.001). Patients were followed up for 112 ± 19 months. Those with clinical VT events had lower Global-RVI than both ARVC and BrS patients without VT (−54.5 ± 13.5 ms vs −36.2 ± 8.8 ms, p = 0.007) and focal VT patients (−30.6 ± 11.5 ms, p = 0.002). Conclusions: RVI reliably identifies the earliest RV endocardial activation site of VT in BrS and ARVC but not focal ventricular arrhythmias and predicts the incidence of haemodynamically significant arrhythmias. Therefore, RVI may be of value in predicting VT exit sites and hence targeting of re-entrant arrhythmias

Character of superposed states under deterministic LOCC

In this paper we investigate the effect of superposition of states on local conversion of pure bipartite states under deterministic LOCC. We are able to form a bridge between comparable and incomparable classes of states through the linear superposition of states. For example, if we consider two pairs of incomparable states, then their superposition may result into a comparable pair of states. We investigate many such cases and provide some of the results in tabular form. We also investigate the entanglement behavior of such classes of states, specifically their monotone nature. Finally we provide some bounds of different measures of entanglement based on the idea of comparability and incomparability under deterministic LOCC.Comment: 9 pages, pdflatex, no figure, to appear in the journal Quantum Information Processin