Authors: Emanuele Berti, Jonathan Gair, Alberto Sesana
Date: 18 Jul 2011
Abstract: Space-based gravitational-wave detectors, such as LISA or a similar ESA-led mission, will offer unique opportunities to test general relativity. We study the bounds that space-based detectors could place on the graviton Compton wavelength \lambda_g=h/(m_g c) by observing multiple inspiralling black hole binaries. We show that while observations of individual inspirals will yield mean bounds \lambda_g~3x10ˆ15 km, the combined bound from observing several events in a two-year mission is about ten times better: \lambda_g~3x10ˆ16 km (m_g~4x10ˆ-26 eV). This result is only mildly dependent on details of black hole formation and detector characteristics. The bound achievable in practice should be one order of magnitude better than this figure (and hence almost competitive with the static, model-dependent bounds from gravitational effects on cosmological scales), because our calculations ignore the merger/ringdown portion of the waveform. The observation that an ensemble of events can sensibly improve the bounds that individual binaries set on \lambda_g applies to any theory whose deviations from general relativity are parametrized by a set of global parameters.
© M. Vallisneri 2012 — last modified on 2010/01/29
Tantum in modicis, quantum in maximis