1. Measuring the propagation speed of gravitational waves with LISA
- Author
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European Commission, Royal Society (UK), Ministerio de Ciencia e Innovación (España), China Scholarship Council, Agencia Estatal de Investigación (España), Swiss National Science Foundation, Kings College London, Science and Technology Facilities Council (UK), Czech Science Foundation, Baker, Tessa, Calcagni, Gianluca, Chen, Anson, Fasiello, Matteo, Lombriser, L., Martinovic, K., Pieroni, Mauro, Sakellariadou, Mairi, Tasinato, Gianmassimo, Bertacca, Daniel, Saltas, I.D., European Commission, Royal Society (UK), Ministerio de Ciencia e Innovación (España), China Scholarship Council, Agencia Estatal de Investigación (España), Swiss National Science Foundation, Kings College London, Science and Technology Facilities Council (UK), Czech Science Foundation, Baker, Tessa, Calcagni, Gianluca, Chen, Anson, Fasiello, Matteo, Lombriser, L., Martinovic, K., Pieroni, Mauro, Sakellariadou, Mairi, Tasinato, Gianmassimo, Bertacca, Daniel, and Saltas, I.D.
- Abstract
The propagation speed of gravitational waves, c , has been tightly constrained by the binary neutron star merger GW170817 and its electromagnetic counterpart, under the assumption of a frequency-independent c . Drawing upon arguments from Effective Field Theory and quantum gravity, we discuss the possibility that modifications of General Relativity allow for transient deviations of c from the speed of light at frequencies well below the band of current ground-based detectors. We motivate two representative Ansätze for c (f), and study their impact upon the gravitational waveforms of massive black hole binary mergers detectable by the LISA mission. We forecast the constraints on c (f) obtainable from individual systems and a population of sources, from both inspiral and a full inspiral-merger-ringdown waveform. We show that LISA will enable us to place stringent independent bounds on departures from General Relativity in unexplored low-frequency regimes, even in the absence of an electromagnetic counterpart.
- Published
- 2022