1,721,037 research outputs found
Right-handed dark matter from Higgs portal induced mixing
No full textRight-handed (RH) Higgs-induced neutrino mixing (RHINO) is an extremely exciting model that is capable of accounting for not only dark matter (DM), but also neutrino masses through the type-1 seesaw model along with the matter-antimatter asymmetry of the universe with leptogenesis. Within this model, the standard model is extended by not only introducing Majorana RH neutrino fields but also a five-dimensional Higgs portal-like effective operator, which is capable of producing and converting a source RH neutrino into a dark RH neutrino, which can play the role of DM. This operator harbours the potential to also induce decays of the dark RH neutrino, which could, in theory, be detected. This is extremely interesting as recently a neutrino flux excess at energies has been confirmed by the IceCube collaboration when analysing the 7.5yr HESE data, wherein the DM neutrino decays could contribute to this excess. The novel aspect of this work is the realisation that the five-dimensional operator could be expanded to allow production of the source RH neutrino, which in turn allows the particle to thermalise without requiring some external physics, thus allowing one to successfully account for the relic abundance whilst allowing a much higher seesaw scale. This higher scale can be above the sphaleron freeze-out temperature and can be as high as 100TeV, therefore allowing the incorporation of strong resonant leptogenesis within the model; thus, one can resolve the matter-antimatter asymmetry of the universe. Within our results, we obtain a 1TeV-1PeV allowed neutrino mass range for the dark RH neutrino. Additionally, our results indicate an effective scale for the Higgs portal interactions, which appears to be that of the hypothetical grand-unified scale GeV, which is many orders of magnitude below the effective mixing scale GeV. Within this work, we also explain how this apparent hierarchy can arise from two UV-complete theories, where the first theory features a SM extension involving a heavy scalar as the mediator, whilst the second and more interesting extension involves a heavy fermion as the mediator, where we see that the first scale corresponds to the scale of new physics, whilst the second much smaller scale is related to very small couplings that can be identified with a symmetry breaking parameter. To summarise, the RHINO model allows us to simply unify neutrino masses, the matter-antimatter asymmetry of the universe, and DM in a testable manner, due to potential decays of the dark RH neutrino, which can be successfully embedded within a grand unified model
Completing RHINO
No full textThe right-handed (RH) Higgs-induced neutrino mixing (RHINO) model explains neutrino masses and origin of matter in the universe within a unified picture. The mixing, effectively described by a dimension five operator, is responsible both for the production of dark neutrinos, converting a small fraction of seesaw neutrinos acting as source, and for their decays. We show that including the production of source neutrinos from Higgs portal interactions, their abundance can thermalise prior to the onset of source-dark neutrino oscillations, resulting into an enhanced production of dark neutrinos that thus can play the role of decaying dark matter (DM) for a much higher seesaw scale. This can be above the sphaleron freeze-out temperature and as high as , so that strong thermal resonant leptogenesis for the generation of the matter-antimatter asymmetry is viable. We obtain a -- allowed dark neutrino mass range. Intriguingly, their decays can also explain a neutrino flux excess at energies recently confirmed by the IceCube collaboration analysing 7.5yr HESE data. Our results also point to an effective scale for Higgs portal interactions nicely identifiable with the grandunified scale and many orders of magnitude below the effective scale for the mixing. We explain this hierarchy in a UV-complete model with a very heavy fermion as mediator: the first scale corresponds to the fundamental scale of new physics, while the second is much higher because of a very small coupling identifiable with a symmetry breaking parameter. Therefore, RHINO realises a simple unified model of neutrino masses and origin of matter in the universe currently under scrutiny at neutrino telescopes and potentially embeddable within a grandunified model
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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