ar X iv : a st ro - p h / 03 08 51 1 v 2 1 3 O ct 2 00 3 Primordial Nucleosynthesis

ar X iv : a st ro - p h / 03 08 51 1 v 1 2 8 A ug 2 00 3 Primordial Nucleosynthesis

The primordial abundances of deuterium, helium-3, helium-4, and lithium-7 probe the baryon density of the Universe only a few minutes after the Big Bang. Of these relics from the early Universe, deuterium is the baryometer of choice. After reviewing the current observational status of the relic abundances (a moving target!), the baryon density determined by big bang nucleosynthesis (BBN) is der...

ar X iv : a st ro - p h / 02 10 42 8 v 1 1 8 O ct 2 00 2 Star Clusters in Interacting Galaxies : The Case of M 51 Nate

ar X iv : a st ro - p h / 02 10 45 9 v 1 2 1 O ct 2 00 2 1 Temporal variation of coupling constants and nucleosynthesis

We investigate the triple-alpha process and the Oklo phenomenon to obtain constraints on possible cosmological time variations of fundamental constants. Specifically we study cosmological temporal constraints for the fine structure constant and nucleon and meson masses.

ar X iv : a st ro - p h / 06 10 08 7 v 1 3 O ct 2 00 6 Jets and Disk - Winds from Pulsar Magnetospheres

We discuss axisymmetric force-free pulsar magnetospheres with magnetically collimated jets and a disk-wind obtained by numerical solution of the pulsar equation. This solution represents an alternative to the quasi-spherical wind solutions where a major part of the current flow is in a current sheet which is unstable to magnetic field annihilation.

ar X iv : a st ro - p h / 03 08 42 1 v 2 9 O ct 2 00 3 Dynamics of Relativistic Flows

Dynamics of relativistic outflows along the rotation axis of a Kerr black hole is investigated using a simple model and the evolution of the speed of the flow relative to the ambient medium is studied. We assume that a flow clump is under the influence of the relativistic tidal force of the central source as well as the Lorentz force due to the large-scale electromagnetic field that is assumed ...