Compactification and spontaneous symmetry breaking in the λϕ4 theory with Kaluza-Klein background

We obtain a one-loop effective action for the ⁴ theory in the space M₄×S_N.We study the questions of compactification and spontaneous symmetry breaking due to the one-loop effective action of the ⁴ theory. We show how the vacuum quantum effects of the scalar field induce the 4-dimensional Einstein-Cartan theory.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 9–14, September, 1988.The author is grateful to I. L. Bukhbinder, I. V. Tyutin, A. A. Tseitlin, and B. L. Spokoinyi for useful discussions.     

Reconfigurable Lateral Spin-Wave Transport in a Ring Magnonic Microwaveguide

JETP Letters - Features of spin-wave dynamics in a ring magnonic microwaveguide that appear at change in the direction of the equilibrium magnetization with respect to the axis of symmetry of the...     

Neuromorphic Calculations Using Lateral Arrays of Magnetic Microstructures with Broken Translational Symmetry

A possibility to control the characteristics of spin waves in a lateral array of magnetic microstructures with broken translational symmetry is demonstrated. The regimes of spatial and frequency selection of the spinwave signal are studied by Brillouin light scattering and by numerical simulations. The micromagnetic simulation is used to study the effect of geometric parameters on the characteristics of dipole-coupled spin waves. The specific features of the coupling between the transverse modes propagating in the system with broken translational symmetry are revealed. The results can be applied to develop multiplexers, power dividers, couplers, and the ultrahigh frequency signal processing circuits using the neuromorphic principles, which are based on the lateral arrays of magnetic microstructures.     

Coupled spin waves in magnetic waveguides induced by elastic deformations in YIG–piezoelectric structures

The numerical simulation and Brillouin spectroscopy measurement have demonstrated the possibility of controlling the properties of coupled spin waves propagating in a transversely limited layered YIG–piezoelectric structure. It has been shown that an electric field applied to the piezoelectric layer induces an inhomogeneous distribution of an internal magnetic field in the ferromagnetic layer, which results in the formation of waveguide channels for spin magnetostatic waves. In this case, the properties of coupled spin waves can be efficiently controlled by varying the magnetization angle of the structure. The results demonstrate the possibility of integration of straintronics and magnonics to fabricate electric- and magnetic-field-controlled power splitters, multiplexers, and microwave couplers.     

Numerical calculation of the magnetic cumulation process

A numerical calculation is made of the process in the MK-1 magnetocumulative generator under the assumption that the magnetic flux is constant and the tube contraction process is one-dimensional. The instantaneous detonation scheme is adopted. The effect of initial magnetic field intensity and relative size of the cavity on the magnitude of the maximal magnetic field intensity obtained inside the tube is studied.Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, Vol. 11, No. 3, pp. 51–55, May–June, 1970.The authors wish to thank L. A. Chudov for his continued interest in the study and valuable advice, and also Yu. V. Korovin for assistance in the calculations.     

Effective action in multidimensional (Super)gravities

In the present paper we have obtained unique effective action ford=5 gravity on the backgroundM ₄×s ₁, whereM ₄ is the Minkowski space,S ₁ is a one-sphere. The effective action is calculated forN=1d=11 supergravity on the backgroundR _n xT _11–n whereR _n is then-dimensional curved space, T_d is thed-dimensional torus. A mechanism of inducing the Einstein gravity with zero--term is proposed.We thank A. O. Barvinsky, E. S. Fradkin, I. V. Tyutin and A. A. Tseytlin for helpful discussions. We are grateful to L. G. Fonova for technical assistance.