Collider Detection of Dark Matter Electromagnetic Anapole Moments

Dark matter that interacts with the Standard Model by exchanging photons through higher multipole interactions occurs in a wide range of both strongly as well as weakly coupled hidden sector models. We study the collider detection prospects of these candidates, with a focus on Majorana dark matter that couples through the anapole moment. The study is conducted at the effective field theory level with the mono-$Z$ signature incorporating varying levels of systematic uncertainties at the high-luminosity LHC. The projected collider reach on the anapole moment is then compared to the reach coming from direct detection experiments like LZ. Finally, the analysis is applied to a weakly coupled completion with leptophilic dark matter.Comment: 24 pages, 9 figure

Environmental typology of rivers from the Brazilian semiarid as a first step for the application of the index of biotic integrity: The case of the Chapada Diamantina

Defining environmental river types is an essential step in the development of accurate fish‐based methods (IBI, Index of Biotic Integrity) to assess the environmental quality of aquatic ecosystems. In this study, the environmental typology of the rivers and streams in the region of Chapada Diamantina was developed. Thirty‐five sampling sites representative of the upper Paraguaçu River and its main tributaries were characterized to characterize the fish assemblages and abiotic environmental descriptors. A cluster analysis based on fish species CPUE was performed to define a first biological typology. Then, a discriminant analysis model was developed to select the environmental descriptors that explained the fish‐based river types. The model selected 11 environmental variables and classified 91% of the cases. The river typology defined in this study will be used for the development of an IBI to assess the ecological status of the Chapada Diamantina rivers. It is expected that both the typology developed here and the future IBI will provide important and useful tools to develop and apply nature conservation‐oriented management schemes in the Chapada Diamantina aquatic ecosystems.info:eu-repo/semantics/acceptedVersio

Compact stars within an asy-soft quark-meson-coupling model

We investigate compact star properties within the quark meson coupling model (QMC) with a soft symmetry energy density dependence at large densities. In particular, the hyperon content and the mass/radius curves for the families of stars obtained within the model are discussed. The hyperon-meson couplings are chosen according to experimental values of the hyperon nuclear matter potentials, and possible uncertainties are considered. It is shown that a softer symmetry energy gives rise to stars with less hyperons, smaller radii and larger masses. Hyperon-meson couplings may also have a strong effect on the mass of the star.Comment: 7 pages, revtex, accepted in Phys. Rev.

Method to obtain nonuniformity information from field emission behavior

Copyright © 2010 American Vacuum Society / American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Vacuum Science and Technology Part B: Microelectronics and Nanometer Structures, 28(3), Article number 441 and may be found at http://scitation.aip.org/content/avs/journal/jvstb/28/3/10.1116/1.3327928.This article describes the characterization of field emission from a planar cathode to a spherical anode with the approach curve method (ACM). In such a diode configuration the electric field strength at the cathode surface is nonuniform. This nonuniformity gives an extra degree of freedom and it allows the interpretation of the current-voltage and voltage-distance (V×d) curves in terms of nonuniformity. The authors apply the ACM to Cu emitters to explain the nonlinearity of the V×d curve in ACM measurements. This analysis provides a good insight into field emission phenomena, supporting a method for nonuniformity characterization based on field emission behavior

The 2020 oil price war has increased integration between G7 stock markets and crude oil WTI

This paper aims to examine whether the oil price war between Saudi Arabia and Russia has increased integration between the Crude Oil WTI Spot oil index and the G7 stock markets, namely France (CAC 40), Germany (DAX 30), USA (DOW JONES), UK (FTSE 100), Italy (FTSE MID), Japan (Nikkei 225), Canada (S&P TSX), from January 2018 to January 2021. The results show that in the period before the oil price war, the G7 stock markets and the WTI index had 29 integrations (out of 56 possible). The WTI index is integrated with the UK stock markets (FTSE 100), and Japan (NIKKEI 225), and is integrated into the Japanese market. In the period of the oil price war, the G7’s stock markets and the Crude Oil WTI Spot index had 43 integrations (out of 56 possible), namely the WTI, Dow Jones, and Nikkei 225 indexes, with all their peers (7 out of 7 possible). When comparing the period before and during the 2020 oil crash, we found that integrations increased significantly from 29 to 43 (out of 56 possible); we also found that the Crude Oil WTI Spot index is no longer a safe haven for portfolio diversification in G7 stock markets. These findings validate our research issue, i.e., the oil price war between Saudi Arabia and Russia had increased integrations, and this evidence could question portfolio diversification.info:eu-repo/semantics/publishedVersio

International Accounting Standards Board: An examination of the main financial and accounting topics addressed in the literature related to the COVID-19 pandemic

The International Accounting Standards Board (IASB) conducts very demanding and complex work to setting accounting standards. The outputs produced by this board and their acts have been scrutinized over the years, by practitioners and academics. This study aims to contribute to the knowledge on the role of IASB by unveiling the research trends address­ing this group of accounting experts and its publications. Through the anal­ysis of the bibliometric data related to COVID-19 issues, this study identifies the main topics addressed in the literature during this pandemic. The results contribute to assessing the research conducted in this field and for creating the future research agenda on addressing the role and impact of the IASB during health, social and economic crises.info:eu-repo/semantics/publishedVersio

COVID-19 research streams emerging in International Financial Reporting Standards related studies

Interpretation for the adoption of the International Financial Reporting Standards (IFRS) became to be challenging for organizations. Over time, these standards are changed to accommodate the improvements identified in accounting rules. COVID-19 pandemic impacted accounting reporting considering that contingencies and risks arising from this health crisis should be reported to stakeholders. In order to provide empirical evidence of the most important COVID-19 related practical and academic issues and challenges addressed by academics when reporting under IFRS, this study applies an automated computer-aided analysis for clustering the bibliometric data published concerning IFRS and COVID-19. The results support academic studies and practitioners by identifying the COVID-19 research streams that received the most attention in 2020. This study also suggests guidelines for future research that derive from past academic contributions.info:eu-repo/semantics/publishedVersio

Trends in the management accounting research: A review of the literature published during the COVID-19 pandemic

Management accounting theory aims to contribute to managers using accounting reports for supporting their management decisions. During the COVID-19 pandemic, such insights would be essential for supporting decisions during lockdowns and other policy makers’ rules imposed by this health crisis. To unveil how academic literature addresses management accounting challenges arising from the COVID-19 specific context, this study conducts an automated computer analysis of the bibliometric data addressing financial issues related to the COVID-19 pandemic.info:eu-repo/semantics/publishedVersio