Experimental studies on the irreversible growth of field-induced chains of dipolar particles suggest an asymptotic power-law behavior of several relevant quantities. We introduce a Monte Carlo model of chain growth that explicitly incorporates the anisotropic diffusion characteristic of a rodlike object. Assuming a simple power-law form for the mean cluster size S(t);t, the results of our model...

A complete understanding of the origin of the prestellar core mass function (CMF) is crucial. Two major features of the prestellar CMF are 1) a broad peak below 1 M , presumably corresponding to a mean gravitational fragmentation scale, and 2) a characteristic power-law slope, very similar to the Salpeter slope of the stellar initial mass function (IMF) at the high-mass end. While recent Hersch...

A unified approach has been developed to study nonlinear dynamics of a 1D lattice of particles with long-range power-law interaction. A classical case is treated in the framework of the generalization of the well-known Frenkel-Kontorova chain model for the non-nearest interactions. Quantum dynamics is considered following Davydov’s approach for molecular excitons. In the continuum limit the pro...

We present the results of a broad band (3-200 keV) spectral analysis of BeppoSAX and XMM-Newton observations of the Vela plerion. The hard X-ray (>15 keV) emission is found to be extended over a region of 12 ′ − 15 ′ radius, corresponding to a size of about 1.0–1.3 pc for a source distance of 290 pc. A single power law does not give an acceptable fit while a broken power law or a log-parabolic ...

Distributions derived from non-extensive Tsallis statistics are closely connected with dynamics described by a nonlinear Fokker-Planck equation. The combination shows promise in describing stochastic processes with power-law distributions and superdiffusive dynamics. We investigate intra-day price changes in the S&P500 stock index within this framework by direct analysis and by simulation. We f...

We study turbulence induced by the Rayleigh-Taylor (RT) instability for 2D immiscible two-component flows using a multicomponent lattice Boltzmann method. compare our results with extension to case of phenomenological theory 3D RT studied Chertkov and collaborators. In case, enstrophy shows tendency grow as $\ensuremath{\propto}{t}^{3/2}$, highest vorticity values concentrated close interface. ...

We study the critical properties of the Bak-Sneppen coevolution model on scalefree networks by Monte Carlo method. We report the distribution of the avalanche size and fractal activity through the branching process. We observe that the critical fitness fc(N) depends on the number of the node such as fc(N) ∼ 1/ log(N) for both the scale-free network and the directed scale-free network. Near the ...

A report is presented on Suzaku observations of the ultra-luminous X-ray source X-1 in the starburst galaxy M82, made three time in 2005 October for an exposure of ∼ 30 ks each. The XIS signals from a region of radius 3 around the nucleus defined a 2–10 keV flux of 2.1× 10 erg s cm attributable to point sources. The 3.2–10 keV spectrum was slightly more convex than a power-law with a photon ind...

We derive a self similar solution for the propagation of an extreme relativistic (or Newtonian) radiative spherical blast wave into a surrounding cold medium. The solution is obtained under the assumption that the radiation process is fast, it takes place only in the vicinity of the shock and that it radiates away a fixed fraction of the energy generated by the shock. In the Newtonian regime th...