BlackHoles@Home

BlackHoles@Home
Project
Status	Not Started
Category	Astrophysics
Development
Developer	Etienne Research Group (Prof. Z. Etienne)
Initial release	Not released
Repository	https://github.com/nrpy/nrpy
Software
Written in	C, C++, Python (NRPy+ framework)
Metadata
Website	https://blackholesathome.net/
License	Open-source components (NRPy+, SymPy)

BlackHoles@Home will be a volunteer distributed computing project seeking assistance in conducting black hole collision simulations. These simulations are intended to support analysis of gravitational wave observations of merging black holes.

Numerical relativity grid structure used in modern simulations of compact binaries (illustrative).

Overview

BlackHoles@Home is a proposed volunteer distributed computing project aimed at performing numerical simulations of binary black hole inspirals and mergers. The project is motivated by the need for large catalogs of gravitational waveform templates used in the interpretation of gravitational wave detections.

The project builds conceptually on advances in numerical relativity, the field of solving Einstein’s field equations using high-performance computation. These simulations are essential for modeling the strong-field regime of general relativity where analytic solutions are not available.

Black hole collision and merger releasing gravitational waves

Scientific Context

The two-body problem in general relativity—such as two orbiting black holes—requires solving Einstein’s field equations numerically. Unlike the Newtonian two-body problem, these systems emit gravitational waves, carrying away energy and angular momentum, causing the objects to inspiral and eventually merge.

The first direct detection of gravitational waves in 2015 by the LIGO Scientific Collaboration confirmed long-standing predictions of general relativity and marked the beginning of gravitational wave astronomy.

Why BlackHoles@Home?

Accurate gravitational waveform catalogs are required to interpret signals detected by observatories such as LIGO and Virgo. These catalogs are typically generated using supercomputer-scale numerical relativity simulations.

BlackHoles@Home is intended to reduce the computational cost of such simulations by approximately an order of magnitude or more through optimized numerical grids and efficient coordinate systems.

Methods

The proposed system relies on modern formulations of the Einstein field equations implemented in curvilinear coordinate systems, including spherical-like coordinates, which can improve computational efficiency in compact binary systems.

The project is closely associated with the NRPy+ framework, an open-source symbolic code generation system that converts tensorial expressions into optimized C code using the SymPy computer algebra system.

NRPy+ is designed to support numerical relativity research by automating derivation and optimization of evolution equations for Einstein’s equations.

Software and Infrastructure

If implemented, BlackHoles@Home would operate on the BOINC platform, allowing volunteer computers to contribute computational resources to large-scale simulations.

BOINC has been widely used in scientific distributed computing projects such as SETI@home and Einstein@Home.

Project Status

As of its last public description, BlackHoles@Home remains a planned project and has not yet been launched as an active BOINC project. Development efforts have focused primarily on the underlying numerical relativity software stack rather than a production volunteer computing deployment.

Team and Funding

The project is associated with Prof. Z. Etienne and the Etienne Research Group. Funding sources have included NSF grant PHY-1806596, NSF EPSCoR Grant 1458952, and NASA grants 80NSSC18K0538 and 80NSSC18K1488.

Related Work

• wikipedia:Numerical relativity
• wikipedia:Gravitational wave
• wikipedia:LIGO Scientific Collaboration
• wikipedia:BOINC
• wikipedia:Einstein@Home

External links

• https://blackholesathome.net/
• https://github.com/nrpy/nrpy
• https://boinc.berkeley.edu/