CHRONOS White Paper

This white paper is an official document that comprehensively presents the scientific goals, technical design, international collaboration framework, and long-term development plan of

Cryogenic sub-Hz cROss torsion-bar detector with quantum NOn-demolition Speed meter (CHRONOS).

CHRONOS is a next-generation interferometer project aiming at the detection of gravitational waves in the sub-Hz frequency band, particularly targeting the stochastic gravitational-wave background.
By integrating cryogenic torsion-bar technology with quantum non-demolition (QND) speed-meter interferometry, CHRONOS seeks to achieve low-frequency sensitivity beyond that of conventional position-meter interferometers.

This document includes:

• Scientific background and the significance of stochastic gravitational-wave observations
• Detector concept and optical configuration
• Quantum-noise reduction strategies and mirror-coating development
• Calibration methods and systematic-error evaluation
• Data analysis strategies (CBC and stochastic background searches)
• International collaboration structure and development roadmap

We invite researchers, students, and collaborators to use this document as a foundational reference for understanding the scientific vision and technical strategy of the CHRONOS project.

▶ Download White Paper (arXiv)

Last update: 2026 Mar.11