147 research outputs found
Equivalence between the Lovelock-Cartan action and a constrained gauge theory
We show that the four-dimensional Lovelock-Cartan action can be derived from
a massless gauge theory for the group with an additional BRST trivial
part. The model is originally composed by a topological sector and a BRST exact
piece and has no explicit dependence on the metric, the vierbein or a mass
parameter. The vierbein is introduced together with a mass parameter through
some BRST trivial constraints. The effect of the constraints is to identify the
vierbein with some of the additional fields, transforming the original action
into the Lovelock-Cartan one. In this scenario, the mass parameter is
identified with Newton's constant while the gauge field is identified with the
spin-connection. The symmetries of the model are also explored. Moreover, the
extension of the model to a quantum version is qualitatively discussed.Comment: 17 pages. No figures. Final version accepted for publication at the
EPJ
Monitoring of downloads of Belgorod State University (Russia) scientists' publications by scientists from other countries
The article presents a review on the functioning of the ResearchGate network and the growth of its popularity both from the literary data and from the experiments in the Google Scholar search engine. It describes a unique weekly monitoring experiments of downloads of Belgorod State University (Russia) scientists' publications by scientists from other countries (starting on 11.01.2015 through 20.12.2015), and it is shown that scientists from the United States (about 10,000 downloads in 2015) and China (about 6,000 downloads in 2015) are most interested in these publication
Cross correlation analysis between SNIP, SJR and if for selected journals
The cross correlation analysis was presented in the given article and linear regression equations between various types of journal metrics (SNIP, SJR, IF) were obtained for economics and mathematics and computer science journal
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