TY - JOUR
T1 - Measuring the propagation speed of gravitational waves with LISA
AU - LISA Cosmology Working Group
AU - Baker, Tessa
AU - Calcagni, Gianluca
AU - Chen, Anson
AU - Fasiello, Matteo
AU - Lombriser, Lucas
AU - Martinovic, Katarina
AU - Pieroni, Mauro
AU - Sakellariadou, Mairi
AU - Tasinato, Gianmassimo
AU - Bertacca, Daniele
AU - Saltas, Ippocratis D.
N1 - Publisher Copyright:
© 2022 The Author(s)
PY - 2022/8/1
Y1 - 2022/8/1
N2 - The propagation speed of gravitational waves, cT , has been tightly constrained by the binary neutron star merger GW170817 and its electromagnetic counterpart, under the assumption of a frequency-independent cT . Drawing upon arguments from Effective Field Theory and quantum gravity, we discuss the possibility that modifications of General Relativity allow for transient deviations of cT from the speed of light at frequencies well below the band of current ground-based detectors. We motivate two representative Ansätze for cT (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 cT (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.
AB - The propagation speed of gravitational waves, cT , has been tightly constrained by the binary neutron star merger GW170817 and its electromagnetic counterpart, under the assumption of a frequency-independent cT . Drawing upon arguments from Effective Field Theory and quantum gravity, we discuss the possibility that modifications of General Relativity allow for transient deviations of cT from the speed of light at frequencies well below the band of current ground-based detectors. We motivate two representative Ansätze for cT (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 cT (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.
KW - Gravitational waves in GR and beyond: theory
KW - modified gravity
UR - http://www.scopus.com/inward/record.url?scp=85136599798&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2022/08/031
DO - 10.1088/1475-7516/2022/08/031
M3 - Article
AN - SCOPUS:85136599798
SN - 1475-7516
VL - 2022
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 8
M1 - 031
ER -