607 research outputs found
Higher spins and matter interacting in dimension three
No full textThe spectrum of Prokushkin--Vasiliev Theory is puzzling in light of the Gaberdiel--Gopakumar conjecture because it generically contains an additional sector besides higher-spin gauge and scalar fields. We find the unique truncation of the theory avoiding this problem to order 2 in perturbations around AdS3. The second-order backreaction on the physical gauge sector induced by the scalars is computed explicitly. The cubic action for the physical fields is determined completely. We comment on a different higher-spin theory without such additional fields at λ=1
On Locality, Holography and Unfolding
No full textWe study the functional class and locality problems in the context of
higher-spin theories and Vasiliev's equations. A locality criterion that is
sufficient to make higher-spin theories well-defined as field theories on
Anti-de-Sitter space is proposed. This criterion identifies admissible
pseudo-local field redefinitions which preserve AdS/CFT correlation functions
as we check in the 3d example. Implications of this analysis for known
higher-spin theories are discussed. We also check that the cubic coupling
coefficients previously fixed in 3d at the action level give the correct CFT
correlation functions upon computing the corresponding Witten diagrams
Higher spin interactions in four-dimensions: Vasiliev versus Fronsdal
No full textWe consider four-dimensional Higher-Spin Theory at the first nontrivial order corresponding to the cubic action. All Higher-Spin interaction vertices are explicitly obtained from Vasiliev's equations. In particular, we obtain the vertices that are not determined solely by the Higher-Spin algebra structure constants. The dictionary between the Fronsdal fields and Higher-Spin connections is found and the corrections to the Fronsdal equations are derived. These corrections turn out to involve derivatives of arbitrary order. We observe that the vertices not determined by the Higher-Spin algebra produce naked infinities, when decomposed into the minimal derivative vertices and improvements. Therefore, standard methods can only be used to check a rather limited number of correlation functions within the HS AdS/CFT duality. A possible resolution of the puzzle is discussed
Retracted Article: Improving the Professional Risk Management System for Methane and Coal Dust Explosions Using a Risk-based Approach
No full textThe second author of the article, namely Evgeny Kabanov, did not
consent to the publication of the results of his research and inclusion in
the list of authors.
The authors, the editor and the Publisher agreed with the retraction
Retracted Article: Improving the Professional Risk Management System for Methane and Coal Dust Explosions Using a Risk-based Approach
No full textThe second author of the article, namely Evgeny Kabanov, did not
consent to the publication of the results of his research and inclusion in
the list of authors.
The authors, the editor and the Publisher agreed with the retraction
FIGURE 3 in A broadly sampled 3-loci plastid phylogeny of Atraphaxis (Polygoneae, Polygonoideae, Polygonaceae) reveals new taxa: II. Atraphaxis selengensis spec. nov., and A. davurica Jaub. & Spach from Russian Transbaikalia
No full textFIGURE 3. Thyrses of Atraphaxis davurica (A), A. davurica var. chikoensis (B), A. pungens (C), A. selengensis (D–E) and A. frutescens from RUSSIA (F). A—Buryatia, Mukhorshibirsky d., Podlopatki, Abramova et al. (MW). B—Buryatia, Khentei-Chikoy Highlands, Anagustay, Maximova (LE). C—Khakassia, Askiz d., Kazanovka, Skvortsov (MW). D—Buryatia, Selenginsk, Poplavskaya & Sukachev 3286 (LE). E—Buryatia, Selenginsk, Daeva (MHA, Holotype). F—Novosibirsk region, Ordynsky d., Antonovo, Kostikov (NS)Published as part of Yurtseva, Olga V., Badmaeva, N.K. & Mavrodiev, Evgeny V., 2021, A broadly sampled 3-loci plastid phylogeny of Atraphaxis (Polygoneae, Polygonoideae, Polygonaceae) reveals new taxa: II. Atraphaxis selengensis spec. nov., and A. davurica Jaub. & Spach from Russian Transbaikalia, pp. 44-74 in Phytotaxa 484 (1) on page 52, DOI: 10.11646/phytotaxa.484.1.2, http://zenodo.org/record/542110
Evgeny Vodolazkin’s „The Aviator” as a Diary Genre
No full textThe purpose of this article is to investigate the diary genre as used in Evgeny Vodolazkin’s novel The Aviator. The author of the paper attempts to describe and emphasize the innovativeness of Vodolazkin’s approach, as compared with the main classic features interpreted in the light of Elena Bogdanova’s article entitled ‘Language features of the diary genre’ (2008) which brings a classification thereof.Целью настоящей статьи является представление творчества современного и самого популярного русского писателя Евгения Германовича Водолазкина в романе Авиатор, написанном в форме дневника. В статье представлен новаторский подход автора к жанру дневника, который сопоставлен с классической классификацией Елены Богдановой в ее научной статье Языковые особенности жанра дневника (2008)
Evgeny G. Pivovarov
No full textThe paper is an attempt to review and clarify data concerning Mikhail Lomonosov’s grammar studies and especially the history of his famous “Russian Grammar”. The authors lay out the timeline of its creation and publication. They describe the main steps on its way from the author to the reader and discuss evidence of its manuscript versions. Scholars know of at least four handwritten copies, none of which survive or have been identified. Only a few related drafts known as “Manuscript 112” or “Materials to the Russian Grammar” are available in the archive of the Russian Academy of Sciences (published in volume 7 of his Lomonosov's Complete Works). The article examines two parts of this manuscript which were apparently written not by Lomonosov: 1) lists of words and drafts of sections devoted to different parts of speech; 2) comments on some paragraphs of the “Russian Grammar”. Comparison of handwriting samples shows that the first part was not, as previously suggested, written by Lomonosov’s long-time assistant and copyist Ivan Barkov, while the second part was probably written by Lomonosov's classmate and fellow worker at the Academy Aleksey Barsov
Proper nouns in Polish and English translation of Evgeny Schwartz’s Дракон
No full textIn the article we analyze proper nouns occurring in Evgeny Schwartz’s Дракон. A very important aspect which should be considered in the play’s translation is its intertextuality. The author refers to other works by taking over the characters and introducing the prototype text components. We will look over the only Polish translation of Jerzy Pomianowski (1965) and three English translations of Elisaveta Fen (1975), Yuri Machkasov (2001) and Anna Epelbaum (2013)
BPS states in string theory
No full textIn this thesis we discuss a number of interesting and important properties of BPS states in string theory. We study wall-crossing behavior of BPS states at large volume limit and implications of it for the OSV conjecture. We find that the weak topological coupling OSV conjecture can be true at most in a special chamber of the K"ahler cone. We also clarify an interesting puzzle arising in the description of BPS states on the Higgs branch of supersymmetic quantum mechanics. Using methods of toric geometry we compute Hilbert spaces of BPS states on the compactified Higgs branch and arrive at completely consistent picture of spatial structure of those spaces. We introduce new kinds of walls, called Bound State Transformation(BST) walls, in the moduli space across which the nature of BPS bound states changes but the index remains continuous. These walls are necessary to explain the continuity of BPS index. BPS states can undergo recombination, conjugation or hybrids of the two when crossing a BST wall. Conjugation phenomenon happens near singularities in the moduli space and we relate massless spectra of BPS states at such singularities to monodromies around them. In cases when massless vector BPS particles are present we find new constraints on the spectrum and in particular predict the existence of magnetic monopoles becoming massless at such singularities. We give a simple physical derivation of the Kontsevich-Soibelman wall-crossing formula. Considering galaxy-like configurations of BPS particles with a central supermassive black hole with a number of stellar BPS systems around it we derive a consistency requirement on the partition function of such BPS galaxies. This requirement turns out to be nothing but Kontsevich-Soibelman wall-crossing formula. Our approach gives a generalization of the formula for the case when massless BPS particles are present.Ph.D.Includes bibliographical referencesIncludes vitaby Evgeny Andriyas
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