Avagyan R.M., Harutyunyan G.H., Sushkov S.V. «On a possible inflationary model of the early Universe» Ученые записки Ереванского государственного университета, физико-математических наук, 50, № 3, с. 11-14 (2016)

We consider the inflationary regime of the expansion of the Universe within the framework of the modified Jordan theory. In this model, a specific cosmological scalar is an analog of the Einstein cosmological constant Λ, which is connected with the Hubble parameter by the power-law φ(Φ)=αH⁴. As a result, a stage of hybrid inflation is obtained, at the end of which the acceleration parameter becomes zero.

Sedrakian A.D. «Hypernuclear matter in compact stars» Ученые записки Ереванского государственного университета, физико-математических наук, 50, № 3, с. 42-46 (2016)

We discuss the recently developed energy density functional for hypernuclear matter, which is based on simultaneous calculation of heavy single-Λ hypernuclei and compact stars containing hypernuclear core. The nucleonic matter is described in terms of a density-dependent parametrization of nucleon-meson couplings, whereas the hyperon-meson couplings are deduced from the octet model. We identify the parameter space of hyperon-meson couplings for which massive stellar configurations with M≤2.1M_⊙ exist and at the same time the laboratory Λ-hypernuclear data can be described.

Sedrakian D.M., Hayrapetyan M.V., Baghdasaryan D.S. «Magnetic field of strange stars» Ученые записки Ереванского государственного университета, физико-математических наук, 50, № 3, с. 47-51 (2016)

The generation of a magnetic field and its distribution inside a rotating strange star are discussed. The difference between the angular velocities of the superfluid and superconducting quark core and of the normal electron plasma increases because of spin-down of the star and this leads to the generation of a magnetic field. The magnetic field distribution in a star is found for a stationary value of difference of angular velocities of these components. In all parts of the star this field is determined entirely by the total magnetic moment M of the star which can vary from 10³¹–10³⁴ G·cm³ for some models of compact stars. Also the maximum possible values of magnetic field on the surface of various models of strange dwarfs have been estimated. Depending on configuration parameters, mass M and radius R of the star, the limit of 10³–10⁵ G has been established. Such values of magnetic field may be an additional condition for identification of strange dwarfs among the large class of observed white dwarfs.

Sarkisyan S.V. «Tridimensional waves at the interface of two elastic media on contact without friction» Ученые записки Ереванского государственного университета, физико-математических наук, 50, № 3, с. 79-83 (2016)

Рассматривается вопрос существования поверхностной волны Стоунли в трехмерной постановке. На границе раздела двух полупространств заданы условия, соответствующие контакту двух полупространств без трения. Исследование задач упрощается введением потенциальных функций по анaлогу с задачами плоской деформации. Получено характеристическое уравнение для определения фазовой скорости поверхностной волны, рассмотрены частные случаи.