Learn More
An iterative method for reconstructing mass distribution in spiral galaxies using a thin disk approximation is developed. As an example, the method is applied to galaxy NGC 4736; its rotation curve does not allow one to employ a model with a massive spherical halo. We find a global mass distribution in this galaxy (without non-baryonic dark matter) that(More)
We study numerically self-trapped (polaron) states of quasiparticles (electrons, holes or excitons) in a deformable nanotube formed by a hexagonal lattice, wrapped into a cylinder (carbon-and boron nitride-type nanotube structures). We present a Hamiltonian for such a system taking into account an electron-phonon interaction, and determine conditions under(More)
An algorithm of finding numerical solutions of pulsar equation is presented which is essentially different from the one used in the pioneering paper by Contopoulos, Kazanas & Fendt. The problem of finding the solutions was reduced to finding expansion coefficients of the source term in a base of orthogonal functions on the unit interval by minimizing a(More)
figures available on request (ArXiv compiler has problems with them) ABSTRACT A global disk model is applied to find mass distribution in spiral galaxies NGC 1365, NGC 6946, NGC 7793. The obtained B-band mass-to-luminosity ratio is lower than 4 for three galaxies. It is consistent with pure baryon matter composition with no need to invoke non-baryonic(More)
It is shown how the appearance of the 1-skyrmion on the three-sphere of radius L can be understood quantitatively by analyzing spectrum of the Hessian at the identity solution. Previously, this analysis was done qualitatively by N. Manton 7 which used a conformal deformation of the identity solution. Analysis of critical appearance of solutions in the(More)
  • 1