Splitting Ward identity

Within the background-field framework we present a path integral derivation of the splitting Ward identity for the one-particle irreducible effective action in the presence of an infrared regulator, and make connection with earlier works on the subject. The approach is general in the sense that it does not rely on how the splitting is performed. This identity is then used to address the problem of background dependence of the effective action at an arbitrary energy scale. We next introduce the modified master equation and emphasize its role in constraining the effective action. Finally, application to general gauge theories within the geometric approach is discussed.Comment: 26 pages; v2: "Conclusions" section added, two paragraphs added to further clarify the gauge-fixing procedure, typos fixed, minor other improvements, to appear in EPJ

Composite Higgs models and extra dimensions

This thesis is organized as follows. Chapter 2 gives an introduction to the subject starting with a discussion of composite Higgs models where the Higgs arises as a PGB. This is followed by introducing the Minimal Composite Higgs Model (MCHM) as a promising example. A simple fact regarding deconstructed models is then addressed as a link to theories with an extra dimension. Chapter 3 is devoted to certain 5D theories and their holographic interpretation. In the first part of this chapter the holographic method for gauge fields is discussed. This method is then applied to the gauge sector of the minimal composite Higgs model in 5D flat space with boundary kinetic terms. A comparison with the more standard KK approach is made afterwards. Introduction to the notion of holography for fermions will be the final part if this chapter. In chapter 4 we introduce three composite-Higgs/GHU models in flat space and study in detail their compatibility with EWPT. The gauge sector of these models is that of the MCHM described previously, and they differ in the way the SM fermions are embedded in complete multiplets of the bulk gauge group. In the first model, known as MCHM_5, fermions are embedded in four fundamental representations. In the second model fermions are embedded in two fundamentals, while in the third model they are embedded in one adjoint representation. Fermionic kinetic terms are also introduced on the UV boundary in the last two models. Details of the computation of the 1-loop corrections to the Z \u304bLbL vertex are collected in Appendix A. In Appendix B after a short introduction to EWPT, 1-loop computation of electroweak precision observables as well as the \u3c7^2 fit performed for our three models are explained in detail

Leading order CFT analysis of multi-scalar theories in d>2

We investigate multi-field multicritical scalar theories using CFT constraints on two- and three-point functions combined with the Schwinger-Dyson equation. This is done in general and without assuming any symmetry for the models, which we just define to admit a Landau-Ginzburg description that includes the most general critical interactions built from monomials of the form $\phi_{i_1} \cdots \phi_{i_m}$. For all such models we analyze to the leading order of the $\epsilon$-expansion the anomalous dimensions of the fields and those of the composite quadratic operators. For models with even $m$ we extend the analysis to an infinite tower of composite operators of arbitrary order. The results are supplemented by the computation of some families of structure constants. We also find the equations which constrain the nontrivial critical theories at leading order and show that they coincide with the ones obtained with functional perturbative RG methods. This is done for the case $m=3$ as well as for all the even models. We ultimately specialize to $S_q$ symmetric models, which are related to the $q$-state Potts universality class, and focus on three realizations appearing below the upper critical dimensions $6$, $4$ and $\frac{10}{3}$, which can thus be nontrivial CFTs in three dimensions.Comment: 58 pages; v2: minor clarifications added, to appear in EPJ

New universality class in three dimensions: The critical Blume-Capel model

We study the Blume-Capel universality class in $d=\frac{10}{3}-\epsilon$ dimensions. The RG flow is extracted by looking at poles in fractional dimension of three loop diagrams using $\overline{\rm MS}$. The theory is the only nontrivial universality class which admits an expansion to three dimensions with $\epsilon=\frac{1}{3}<1$. We compute the relevant scaling exponents and estimate some of the OPE coefficients to the leading order. Our findings agree with and complement CFT results. Finally we discuss a family of nonunitary multicritical models which includes the Lee-Yang and Blume-Capel classes as special cases.Comment: 5 pages, 1 figure, v2: new title, extended introduction, to appear in PR

Medical Journalism and Emergency Medicine

Nowadays, many researches in the field of medicine are conducting all around the world and medical journalism is a way to share the results. In fact, dissemination of the related manuscripts can prevent the repetitive research or may even lead to conducting a better survey. Therefore high quality medical journals are considered as up-to-date resources for further investigations. Medical journals are propagating their papers in various media including television programs, newspapers, internet websites and different social media. So they can influence the government policy makers, health-care professionals and even public. Moreover, most researchers hear about medical discoveries for the first time through medical journals and their related social media. So as well a high quality journal can help to improve medical science, a journal of poor quality can be damaging and distorting. Indeed, popular journals have the power of inventing a “communication storm” to draw attention to a certain topic. Thus they have to respect the accepted international principles to prevent spreading inaccurate and misleading data. This paper aims to review the previous and current situation of medical journalism by focus on field of emergency medicine

Crossover exponents, fractal dimensions and logarithms in Landau-Potts field theories

We compute the crossover exponents of all quadratic and cubic deformations of critical field theories with permutation symmetry $S_q$ in $d=6-\epsilon$ (Landau-Potts field theories) and $d=4-\epsilon$ (hypertetrahedral models) up to three loops.We use our results to determine the $\epsilon$-expansion of the fractal dimension of critical clusters in the most interesting cases, which include spanning trees and forests ($q\to0$), and bond percolations ($q\to1$). We also explicitly verify several expected degeneracies in the spectrum of relevant operators for natural values of $q$ upon analytic continuation, which are linked to logarithmic corrections of CFT correlators, and use the $\epsilon$-expansion to determine the universal coefficients of such logarithms.Comment: 15 pages, 3 tables, 3 figures; v2: improved version with estimates relevant for the cubic model, to appear in EPJ

Electrocardiographic Findings of COVID-19 Patients and Their Correlation with Outcome; a Prospective Cohort Study

Introduction: Being infected with COVID-19 is associated with direct and indirect effects on the cardiopulmonary system and electrocardiography can aid in management of patients through rapid and early identification of these adversities.&nbsp;Objective: The present study was designed aiming to evaluate electrocardiographic changes and their correlation with the outcome of COVID-19 patients.&nbsp;Methods: This Prospective cohort study was carried out on COVID-19 cases admitted to the emergency department of an educational hospital, during late February and March 2020. Electrocardiographic characteristics of patients and their association with in-hospital mortality were investigated.&nbsp;Results: One hundred and nineteen cases with the mean age of 60.52±13.45 (range: 29-89) years were studied (65.5% male). Dysrhythmia was detected in 22 (18.4%) cases. T-wave inversion (28.6%), pulmonale P-wave (19.3%), left axis deviation (19.3%), and ST-segment depression (16.8%) were among the most frequently detected electrocardiographic abnormalities, respectively. Twelve (10.1%) cases died. There was a significant correlation between in-hospital mortality and history of diabetes mellitus (p=0.007), quick SOFA score &gt; 2 (p&lt;0.0001), premature ventricular contraction (PVC) (p=0.003), left axis deviation (LAD) (p=0.039), pulmonale P-wave (p&lt;0.001), biphasic P-wave (p&lt;0.001), inverted T-wave (p=0.002), ST-depression (p=0.027), and atrioventricular (AV) node block (p=0.002). Multivariate cox regression showed that history of diabetes mellitus, and presence of PVC and pulmonale P-wave were independent prognostic factors of mortality.&nbsp;Conclusions: Based on the findings of the present study, 18.4% of COVID-19 patients had presented with some kind of dysrhythmia and in addition to history of diabetes, presence of PVC and pulmonale P-wave were among the independent prognostic factors of mortality in COVID-19 patients

Journal Citation Report 2023 of Emergency Medicine Journals; New Players in the Impact Factor Ranking

Commenced from 1975 and calculated based on the number of overall journal citations in a year divided by the number of citable publications in the preceding two years, Journal Impact Factor (JIF) became a convenient and conventional proxy to appraise a journal's trustworthiness and its scholarly impact in a given field (1)