1,721,078 research outputs found
Surprises from complete vector portal theories: New insights into the dark sector and its interplay with Higgs physics
No full textRecommended from our members
On the Common Origin of Dark and Baryonic Matter Abundances and Cosmological Probes of the Dirac Neutrino
Full text linkAlthough the Standard Model has been a successful description of observedparticles and interactions, there exist open questions and observations which
motivate physics beyond its framework. Of particular importance are the need
for new particles and interactions to explain the origins of the observed baryon
asymmetry, the nature of dark matter, and generation of neutrino mass. This
work is motivated by the coincidental similarity between the baryon asymmetry
and abundance of dark matter which, when taken together with their mysterious
origins, constitutes a cosmological triple puzzle. In this thesis, unique mecha-
nisms which propose new interactions and symmetries between quarks and dark
matter candidates are used to unambiguously address this triple puzzle. These
models predict interesting experimental signatures such as induced proton de-
cay. Additionally, new frameworks which generate neutrino masses such as
gauged and Dirac leptogenesis, utilize new interactions for neutrinos
which would lead to additional, measurable contributions to and
Motivated by these imprints, this thesis also includes a new mechanism to test
the Dirac nature of the neutrino by correlating variables used by cosmological
and terrestrial probes
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Phenomenology of Axion Fields and Topological Defects
Full text linkIn the conventional misalignment mechanism, the axion field is assumed to start with zero initial velocity. However, we introduce an alternative scenario in which the axion field possesses a nonzero initial velocity, potentially due to the breaking of the Peccei–Quinn (PQ) symmetry during the early Universe. Depending on the initial velocity and the sequence of events between PQ symmetry breaking and inflation, this novel scenario can amplify or diminish the expected axion relic abundance compared to the conventional prediction. Consequently, this opens up new parameter regions for axion dark matter models.Global cosmic strings, anticipated in various non-standard models, generate primordial gravitational waves detectable by instruments. We refine the analytical Velocity-dependent One-Scale (VOS) model through recent simulation outcomes, revealing the gravitational wave spectrum produced by global string networks, including Goldstone emission. Our findings present a technique to detect signals from the early universe before Big Bang nucleosynthesis, impacted by the non-standard pre-BBN equation of state and new relativistic particles.Early dark energy, relieving the Hubble tension, imprints discernible characteristics on the primordial stochastic gravitational wave background originating from cosmic string networks. This signal stands out in planned gravitational wave experiments, distinctly separate from other cosmological and astrophysical signals in the gravitational wave frequency spectrum.In the context of axion-like particle (ALP) dark matter theories, we explore enhanced early galaxy formation through the kinetic misalignment mechanism. This has potential relevance to the excess observed by the James Webb Space Telescope (JWST) while adhering to constraints. Viable parameter space is identified for ALP mass within the range of $10^{-22}{\rm eV}Through advanced simulations and analytical modeling, we conduct an updated analysis of long-lived axion domain wall (DW) networks. By scrutinizing energy loss mechanisms and calculating axion emissions from the DW network, we determine their contribution to axion dark matter density. While our results are consistent with prior research, disparities arise, particularly in predicting DM abundance. These disparities could profoundly impact axion phenomenology on a larger scale
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
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