INT Program: Binary Neutron Star Coalescence as a Fundamental Physics Laboratory, Seattle

The program will bring together nuclear physicists, astrophysicists, observational astronomers and gravitational-wave physicists to address key issues and identify new directions in the study of the inspiral and merger of binary neutron stars. The focus will be on the theoretical modeling, with realistic nuclear and neutrino microphysics, of the late stages of binary coalescence and opportunities for multi-messenger observations. Large-scale numerical simulations of the merger and the dynamics of the remnant are now being pursued by several groups world-wide with a level of realism that was unthinkable a few years back. Meanwhile, the first direct detection of gravitational waves from inspiraling and merging binaries is expected once advanced detectors such as LIGO and Virgo stars taking data in their upgraded configurations in 2017. The intrinsically multi-physics and multi-messenger aspects of binary inspirals emphasize the need for better coordination between theoretical, experimental and observational efforts and provide the backbones of the program.

The schedule for the 5 week program is designed to foster interactions among theorists, experimentalists and observers. Discussion topics include realistic numerical simulations, gravitational-wave waveforms modeling and searches, electromagnetic counterpart signals and gamma-ray bursts, nuclear physics including superfluidity, complex hydrodynamics, neutron star seismology and nucleosynthesis. During the last week a workshop will bring together experts working on nucleosynthesis of heavy elements and galactic chemical evolution.

* Week 1: Gravitational waves: Modeling waveforms, parameter estimation, advanced detectors and extracting physics from merger signals.

* Week 2: Numerical Relativity: Status and challenges, incorporating realistic nuclear and neutrino physics, magnetohydrodynamics, dissipative effects and contributions from the crust.

* Week 3: Dense matter physics: Equation of state, neutrino interactions, neutron star seismology and superfluid dynamics, effects of temperature and magnetic fields on matter.

* Week 4: Merger astrophysics: Modeling electromagnetic signals, crust and disk dynamics and connections to gamma-ray bursts and transients.

Week 5: Joint workshop with the program on nucleosynthesis and chemical evolution.

From the perspective of both theory and observations, the diverse phenomena covered by the program have much in common. Simulations rely on the development of improved microphysics models, transport methods for radiation, heat, and neutrinos, hydrodynamics, and nuclear reaction networks. Gravitational-wave observations require reliable theoretical models to identify the signal and facilitate the extraction of physical parameters. Observers will also benefit greatly from deeper insights into key multi-messenger aspects. On the verge of the first gravitational-wave observations, we expect to make considerable progress by bringing together researchers with overlapping interests and expertise on issues that require interdisciplinary information, thus facilitating collaboration and discussion that might otherwise not take place.

A link to the application form can be found at

N. Andersson, University of Southampton
S. Bose, Washington State University
S. Reddy, University of Washington
L. Rezzolla, University of Frankfurt

Program Coordinator
Laura Lee

INT program announcement – Astrophysical Transients

We are glad to announce the upcoming INT Program, “Astrophysical Transients: Multi-Messenger Probes of Nuclear Physics”, to take place at the Institute for Nuclear Theory in Seattle, July 11 to August 5, 2011.

The program will bring together nuclear physicists, astrophysicists, and observational astronomers to address current issues and identify new directions in the study of explosive and transient astrophysical phenomena. The program will emphasize study of astrophysical phenomena through their multi-messenger and multi-wavelength signals, and will bring together observations in the optical band, x-rays, gamma rays, gravitational waves, and neutrinos.

Lodging and per diem for participants will be covered by the INT. Due to space restrictions, attendance will be limited to about 20 participants during each week of the four-week program. More details about the program and an application form can be found at:

If you are interested in attending, please fill out the on-line registration form.

We hope to see you in Seattle!

Ed Brown – Michigan State University
Chris Fryer – Los Alamos National Laboratory
Bennett Link – Montana State University
Sanjay Reddy – Los Alamos National Laboratory