• Casimir force on a single interacting Bose-Einstein condensate in the double-parabola approximationCasimir force on a single interacting Bose-Einstein condensate in the double-parabola approximation

    1. Introduction Bose-Einstein condensate (BEC) has been attracting the attention of many researchers in both theory and experiment. The creation of BEC in the laboratory and recent results has created a great prospect for this promising field [1-4]. One of the basic problems for BEC researchers is to determine the state of the system. In the no...

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  • 5248_6_hoa2_1495 (1)_2326257_20210323_0516595248_6_hoa2_1495 (1)_2326257_20210323_051659

    Abstract. Based on the extended Nambu-Jona-Lasinio model with the scalar-vector eight-point interaction [11], we consider a question to understand of what ultimately happens to exact chiral nuclear matter as it is heated. In the realm of very high temperature the fundamental degrees of freedom of the strong interaction, quarks and gluons, come i...

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  • Convexity properties for some general integral operatorsConvexity properties for some general integral operators

    Abstract. For analitic functions f and g in the open unit disk U. In this paper we consider the classes N(β), K(β) and two integral operarors functions fn(f, g) and Jn(f, g), where g is a functions that the belongs to the family B(µ, β). The main object of this paper is to obtain some properties in this class and and the order of convexity for t...

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  • On the number of determining finite volume elements for 3D Navier-Stokes-Voigt equationsOn the number of determining finite volume elements for 3D Navier-Stokes-Voigt equations

    Abstract. We give an upper bound on the number of determining finite volume elements for 3D Navier-Stokes-Voigt equations in bounded domains with periodic boundary conditions, which is estimated explicitly in terms of flow parameters, such as viscosity, smoothing length, forcing and domain size. Keywords: Navier-Stokes-Voigt equations, weak sol...

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  • Singularities of parametric surfaces of bidegree (1, 2) in the particular casesSingularities of parametric surfaces of bidegree (1, 2) in the particular cases

    Abstract. Parametric surfaces of bidegree (1,2) is described by at most two parameters, called moduli, by a change of coordinates. Its singular locus is generically a twisted cubic curve. In this article, we study all the particular cases and give normal forms of the parameterizations for each case. We give also the implicit equation and describ...

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  • A simple unity theory for three types of polaritons (Phonon polariton, exciton polariton and plasmon polariton) expanded model for surface polaritonsA simple unity theory for three types of polaritons (Phonon polariton, exciton polariton and plasmon polariton) expanded model for surface polaritons

    Abstract. In our previous work which studied the theory of three types of polaritons, we proposed a new simple unity theory for three types of bulk polaritons (phonon polariton, exciton polariton and plasmon polariton). In this work, this theory is expanded for these three types of surface polaritons. We introduce an effective LT-splitting for s...

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  • Thermodynamic properties of binary interstitial alloy with fcc structure: Dependence on temperature and concentration of interstitial atomsThermodynamic properties of binary interstitial alloy with fcc structure: Dependence on temperature and concentration of interstitial atoms

    Abstract. The analytic expressions of the thermodynamic quantities such as the mean nearest neighbor distance, free energy, isothermal and adiabatic compressibilities, the isothermal and adiabatic elastic modulus, the thermal expansion coefficient, heat capacities at constant volume and at constant pressure, and the entropy of binary interstitia...

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  • Study on the melting of substitutional alloy ab with interstitial atom C and FCC structure under pressureStudy on the melting of substitutional alloy ab with interstitial atom C and FCC structure under pressure

    Abstract. From the model of substitutional alloy AB with interstitial atom C and FCC structure and the condition of absolute stability for crystalline state we derive analytic expressions for the temperature of absolute stability for the crystalline state and the melting temperature together with the equation of the melting curve of this alloy b...

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  • Phase transition in Z2 × Z2 model based on the CJT formalismPhase transition in Z2 × Z2 model based on the CJT formalism

    1. Introduction At present it is well known that all physical systems can be classified into several categories: - The first corresponds to those, in which the symmetry broken at T = 0 is restored at high temperature [1, 2]. Here high temperature means that T/M >> 1 for mass scale M of the system. In addition, there is another alternative pheno...

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  • A quantum phase transition in the Bose-Einstein condensatesA quantum phase transition in the Bose-Einstein condensates

    Abstract. Quantum phase transition and dynamical stability in Bose-Einstein condensates (BECs) are studied within the framework of the Cornwall-Jackiw-Tomboulis (CJT) effective action approach. The effective potential is found in the double-bubble diagram approximation. Numerical results show that in this approximation stability is strongly inf...

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