ar X iv : a st ro - p h / 96 12 19 9 v 1 1 9 D ec 1 99 6 Disorientation of Suprathermally Rotating Grains and the Grain Alignment Problem

ar X iv : a st ro - p h / 99 01 23 9 v 1 1 9 Ja n 19 99 Thermal Flipping and Thermal Trapping – New Elements in Dust Grain Dynamics

Received ; accepted – 2 – ABSTRACT Since the classical work by Purcell (1979) it has been generally accepted that most interstellar grains rotate suprathermally. Suprathermally rotating grains would be nearly perfectly aligned with the magnetic field by paramagnetic dissipation if not for " crossovers " , intervals of low angular velocity resulting from reversals of the torques responsible for ...

ar X iv : a st ro - p h / 96 11 14 3 v 1 1 9 N ov 1 99 6 A high deuterium abundance in the early Universe

ar X iv : a st ro - p h / 96 12 22 0 v 1 2 3 D ec 1 99 6 BLACK HOLES : FROM GALACTIC NUCLEI TO ELEMENTARY PARTICLES 1

We present a broad review on black holes. We analyse some of the fundamental concepts in black hole theory, the observational and theoretical status of stellar and galactic black holes, and their appearance

X iv : a st ro - p h / 96 12 22 7 v 1 2 3 D ec 1 99 6 Conditional calculus on fractal structures and its application to galaxy distribution

ar X iv : a st ro - p h / 99 10 11 6 v 1 6 O ct 1 99 9 Overview of Grain Models

The properties of interstellar grains can now be defined by a rapidly growing wealth of observational data. We rely upon models to combine these data with unobserved properties such as the size distribution of grains, their structure and shape, and their detailed chemical composition, in a self-consistent manner. I will review the observational constraints which define the boundaries for possib...