Gravitational Wave (GW) Classification, Space GW Detection Sensitivities and AMIGO (Astrodynamical Middle-frequency Interferometric GW Observatory)

TL;DR

This paper reviews gravitational wave spectral classification, discusses space-based GW detection sensitivities across various frequency bands, and proposes the AMIGO observatory for middle-frequency GW detection.

Contribution

It introduces the concept of AMIGO, a novel space-based interferometric GW observatory targeting middle-frequency bands, expanding detection capabilities.

Findings

Sensitivity estimates for space GW detectors in low and middle frequency bands.

Potential to detect GWs from diverse astrophysical sources.

Proposal of the AMIGO observatory for enhanced GW detection.

Abstract

After first reviewing the gravitational wave (GW) spectral classification. we discuss the sensitivities of GW detection in space aimed at low frequency band (100 nHz-100 mHz) and middle frequency band (100 mHz-10 Hz). The science goals are to detect GWs from (i) Supermassive Black Holes; (ii) Extreme-Mass-Ratio Black Hole Inspirals; (iii) Intermediate-Mass Black Holes; (iv) Galactic Compact Binaries; (v) Stellar-Size Black Hole Binaries; and (vi) Relic GW Background. The detector proposals have arm length ranging from 100 km to 1.35x109 km (9 AU) including (a) Solar orbiting detectors and (b) Earth orbiting detectors. We discuss especially the sensitivities in the frequency band 0.1-10 microHz and the middle frequency band (0.1 Hz-10 Hz). We propose and discuss AMIGO as an Astrodynamical Middle-frequency Interferometric GW Observatory.