ha o - dy n / 98 03 03 2 v 1 2 6 M ar 1 99 8 Bursts and Shocks in a Continuum Shell Model

ha o - dy n / 99 03 03 2 v 1 2 3 M ar 1 99 9 On the classical dynamics of billiards on the sphere

We study the classical motion in bidimensional polygonal billiards on the sphere. In particular we investigate the dynamics in tiling and generic rational and irrational equilateral triangles. Unlike the plane or the negative curvature cases we obtain a complex but regular dynamics.

ar X iv : a st ro - p h / 98 03 21 2 v 1 1 8 M ar 1 99 8 Anisotropy of CMB & Cosmological Model

In this brief review I will touch upon the main points and trends of observational and theoretical cosmology, that influence and change today our understanding of the Universe.

ar X iv : m at h / 98 03 04 6 v 1 [ m at h . PR ] 1 1 M ar 1 99 8 LOCAL FIELDS , GAUSSIAN MEASURES , AND BROWNIAN MOTIONS Steven

ar X iv : c ha o - dy n / 99 05 01 6 v 1 1 2 M ay 1 99 9 Pulses in the Zero - Spacing Limit of the GOY Model

We study the propagation of localised disturbances in a turbulent, but momentarily quiescent shell model (an approximation of the Navier-Stokes equations on a set of exponentially spaced momentum shells). These disturbances represent bursts of turbulence travelling down the inertial range, which is thought to be responsible for the intermittency observed in turbulence. Starting from the GOY she...

ar X iv : a st ro - p h / 98 03 06 9 v 1 6 M ar 1 99 8 The Size Distribution of Superbubbles in the Interstellar Medium

We use the standard, adiabatic shell evolution to predict the size distribution N (R) for populations of SN-driven superbubbles in a uniform ISM. We derive N (R) for simple cases of superbubble creation rate and mechanical luminosity function. We then compare our predictions for N (R) with the largely complete H i hole catalogue for the SMC, with a view toward the global structure of the ISM in...