Introduction to the Classical Theory of Higher Spins

We review main features and problems of higher spin field theory and flash some ways along which it has been developed over last decades.Comment: JHEP Style, 32 pages; v2 typos corrected, comments and references added; v3 new material in Section 3 and refs. added, version published in AIP Conf.Proc. 767(2005)17

Introduction to the Superembedding Description of Superbranes

Basics of the geometrical formulation of the dynamics of supersymmetric objects are considered and its relation to conventional formulations of superbranes is discussed. In particular, we demonstrate how the kappa-symmetry of the Green-Schwarz formulation shows up from local worldvolume supersymmetry, and briefly discuss applications of the superembedding approach.Comment: LaTeX2e file, 11 pages. Invited lecture given at the XXXVII Karpacz Winter School "New Developments in Fundamental Interactions Theories" (February 6-15, 2000, Karpacz, Poland). To be published in Proceeding

Coincident (Super)-Dp-Branes of Codimension One

We consider properties of a covariant worldvolume action for a system of N coincident Dp-branes in D=(p+2) dimensional space-time (so called codimension one branes). In the case of N coincident D0-branes in D=2 we then find a generalization of this action to a model which includes fermionic degrees of freedom and is invariant under target-space supersymmetry and worldline kappa-symmetry. We find that the type IIA D=2 superalgebra generating the supersymmetry transformations of the ND0-brane system acquires a non-trivial "central extension" due to a nonlinear contribution of U(N) adjoint scalar fields. Peculiarities of space-time symmetries of coincident Dp-branes are discussed.Comment: LaTeX2e file, 14 pages. Some signs corrected. Version published in JHE

Economic Theory, Economic Reality and Economic Policy

This paper analyzes the opposition between the «liberals» and «statists» in the Russian political and economic thought. It demonstrates that the economic liberalization is an absolute prerequisite for the transition to sustainable socio-economic development. Such development must rely on investment activities of the state, which in the current circumstances is a necessary but not sufficient measure for reversing the negative trends. The negative developments can be prevented only through implementation, along with the institutional changes in the economic area that form a strata of economically independent entrepreneurs-innovators, of no less profound transformation in political institutions aimed at democratization of public life