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Akademický článek

Octagon with finite bridge: free fermions and determinant identities

Autor: Ivan Kostov, Valentina B. Petkova

Publikováno v: Journal of High Energy Physics, Vol 2021, Iss 6, Pp 1-29 (2021)

Abstract We continue the study of the octagon form factor which helps to evaluate a class of four-point correlation functions in N $$ \mathcal{N} $$ = 4 SYM theory. The octagon is characterised, besides the kinematical parameters, by a “bridge” o

Externí odkaz: https://doaj.org/article/619854ae141547b198d520c498bef66f

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Akademický článek

The octagon as a determinant

Autor: Ivan Kostov, Valentina B. Petkova, Didina Serban

Publikováno v: Journal of High Energy Physics, Vol 2019, Iss 11, Pp 1-27 (2019)

Abstract The computation of a certain class of four-point functions of heavily charged BPS operators boils down to the computation of a special form factor — the octagon. In this paper, which is an extended version of the short note [1], we derive

Externí odkaz: https://doaj.org/article/efe64b3a94ca44dd84d4d09a4d89e32f

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Akademický článek

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Skeletal Deformity in Children with Primary Hyperparathyroidism

Autor: M I, Dikova, B, Petkova, V, Alexiev

Publikováno v: Acta chirurgiae orthopaedicae et traumatologiae Cechoslovaca. 88(5)

Skeletal deformation like genu valgum is reported to be rare in Primary hyperparathyroidism (PHPT). The solitary adenoma or hyperplasia of the parathyroid glands are the cause in 80-85% of the cases. We report 2 cases of girls on 12 years and 15 year

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::0c22edfef01dd27e57fd8c112173788b
https://pubmed.ncbi.nlm.nih.gov/34738897

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Akademický článek

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Aperture-Coupled Microstrip Patch Antenna Design Using FEM Simulation Technique

Autor: Diana B. Petkova, Peter Petkov

Publikováno v: 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST).

The recent developments in microwave systems, put high requirements to antenna arrays for RFID and radar applications, in terms of pattern shape and side lobe specs. The presented paper discusses an inexpensive approach for amplitude distribution con

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2d14617ffaac521482bdaf5cf0d37243
https://doi.org/10.1109/icest52640.2021.9483494

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Octagon with finite bridge: free fermions and determinant identities

Autor: Valentina B. Petkova, Ivan Kostov

Publikováno v: JHEP
JHEP, 2021, 06, pp.098. ⟨10.1007/JHEP06(2021)098⟩
Journal of High Energy Physics, Vol 2021, Iss 6, Pp 1-29 (2021)
Journal of High Energy Physics
Journal of High Energy Physics, 2021, 06, pp.098. ⟨10.1007/JHEP06(2021)098⟩

We continue the study of the octagon form factor which helps to evaluate a class of four-point correlation functions in $\mathcal{N}=4$ SYM theory. The octagon is characterised, besides the kinematical parameters, by a "bridge" of $\ell$ propagators

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::59b64650ac1b6c13fcc99072fd8859bf
https://hal.archives-ouvertes.fr/hal-03157120

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Akademický článek

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Akademický článek

A Finite Liouville Dress for c

Autor: P. Furlan, V. B. Petkova, M. Stanishkov

Publikováno v: Acta Polytechnica, Vol 50, Iss 3 (2010)

We review the derivation of a general formula for the Liouville dressing factor in the boundary 3-point tachyon correlator with c < 1 degenerate matter.

Externí odkaz: https://doaj.org/article/a58bd17bd3e0492b89e5634debaa32e6

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Foamability of surfactant solutions: Interplay between adsorption and hydrodynamic conditions

Autor: B. Petkova, Slavka Tcholakova, Nikolai D. Denkov

Publikováno v: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 626:127009

The foamability of surfactant solutions depends strongly on the adsorption properties of the surfactants, their concentrations, and the foaming test used for foam generation. The aim of the current study is to analyse the subtle interplay between the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b5cdfa0321e03fcaea63ee275d5058dd
https://doi.org/10.1016/j.colsurfa.2021.127009

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