Hydrodynamics of Coalescing Binary Neutron Stars: Ellipsoidal Treatment

We employ an approximate treatment of dissipative hydrodynamics in three dimensions to study the coalescence of binary neutron stars driven by the emission of gravitational waves. The stars are modeled as compressible ellipsoids obeying a polytropic equation of state; all internal fluid velocities are assumed to be linear functions of the coordinates. The hydrodynamic equations then reduce to a set of coupled ordinary differential equations for the evolution of the principal axes of the ellipsoids, the internal velocity parameters and the binary orbital parameters. Gravitational radiation reaction and viscous dissipation are both incorporated. We set up exact initial binary equilibrium configurations and follow the transition from the quasi-static, secular decay of the orbit at large separation to the rapid dynamical evolution of the configurations just prior to contact. A hydrodynamical instability resulting from tidal interactions significantly accelerates the coalescence at small separation, leading to appreciable radial infall velocity and tidal lag angles near contact. This behavior is reflected in the gravitational waveforms and may be observable by gravitational wave detectors under construction.Comment: 14 pages, plain TeX, CRSR-107

An Overview of KQML: A Knowledge Query and Manipulation Language

We describe a language and protocol intended to support interoperability among intelligent agents in a distributed application. Examples of applications envisioned include intelligent multi-agent design systems as well as intelligent planning, scheduling and replanning agents supporting distributed transportation planning and scheduling applications. The language, KQML for Knowledge Query and Manipulation Language, is part of a larger DARPA-sponsored Knowledge Sharing effort focused on developing techniques and tools to promote the sharing on knowledge in intelligent systems. We will define the concepts which underly KQML and attempt to specify its scope and provide a model for how it will be used

Specification of the KQML Agent-Communication Language

this document send a message to [email protected]) Tim Finin (co-chair) University of Maryland Jay Weber (co-chair) Enterprise Integration Technologies Gio Wiederhold (former co-chair) Stanford University Michael Genesereth Stanford University Richard Fritzson Donald McKay Paramax Systems James McGuire Richard Pelavin Lockheed AI Center Stuart Shapiro SUNY Buffalo Chris Beck University of Toronto February 9, 1994 CONTENTS