2016/07/04 by Takashi Nakamura, Masaki Ando, Nakamura, Takashi +21 · 1 citation
Physics and Astronomy · #Adaptive optics and wavefront sensing #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Astrophysical Phenomena (astro-ph.HE) #Pulsars and Gravitational Waves Research #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.1607.00897
openalex publication_date 2016/07/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Pre-DECIGO consists of three spacecraft arranged in an equilateral triangle with 100km arm lengths orbiting 2000km above the surface of the earth. It is hoped that the launch date will be in the late 2020s. Pre-DECIGO has one clear target: binary black holes (BBHs) like GW150914 and GW151226. Pre-DECIGO can detect ∼ 30M_\odot-30M_\odot BBH mergers up to redshift z∼ 30. The cumulative event rate is ∼ 1.8× 105 \rm events~yr-1 in the Pop III origin model of BBHs like GW150914, and it saturates at z∼ 10, while in the primordial BBH (PBBH) model, the cumulative event rate is ∼ 3× 104 \rm events~ yr-1 at z=30 even if only 0.1% of the dark matter consists of PBHs, and it is still increasing at z=30. In the Pop I/II model of BBHs, the cumulative event rate is (3-10)×105 \rm events~ yr-1 and it saturates at z ∼ 6. We present the requirements on orbit accuracy, drag free techniques, laser power, frequency stability, and interferometer test mass. For BBHs like GW150914 at 1Gpc, SNR∼ 90 is achieved with the definition of Pre-DECIGO in the 0.01-100Hz band. Pre-DECIGO can measure the mass spectrum and the z-dependence of the merger rate to distinguish various models of BBHs like GW150914. Pre-DECIGO can also predict the direction of BBHs at z=0.1 with an accuracy of ∼ 0.3 \rm deg2 and a merging time accuracy of ∼ 1s at about a day before the merger so that ground-based GW detectors further developed at that time as well as electromagnetic follow-up observations can prepare for the detection of merger in advance. For intermediate mass BBHs at a large redshift z > 10, the QNM frequency after the merger can be within the Pre-DECIGO band so that the ringing tail can also be detectable to confirm the Einstein theory of general relativity with SNR∼ 35. [abridged]