Model-Independent Test of General Relativity: An Extended post-Einsteinian Framework with Complete Polarization Content
By K. Chatziioannou, N. Yunes, N. Cornish. 2012
151 citations recorded by the source corpus.
We develop a model-independent test of general relativity that allows for the constraint of the gravitational wave (GW) polarization content with GW detections of binary compact object inspirals. We first consider three modified gravity theories (Brans-Dicke theory, Rosen's theory, and Lightman-Lee theory) and calculate the response function of ground-based detectors to gravitational waves in the inspiral phase. This allows us to see how additional polarizations predicted in these theories modify the general relativistic prediction of the response function. We then consider general power-law modifications to the Hamiltonian and radiation-reaction force and study how these modify the time-domain and Fourier response function when all polarizations are present. From these general arguments and specific modified gravity examples, we infer an improved parameterized post-Einsteinian template family with complete polarization content. This family enhances general relativity templates through the inclusion of new theory parameters, reducing to the former when these parameters acquire certain values, and recovering modified gravity predictions for other values, including all polarizations. We conclude by discussing detection strategies to constrain these new, polarization theory parameters by constructing certain null channels through the combination of output from multiple detectors.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/13ef4c05c814683377115fc51b545129c7d1a825
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In Astronomy and Astrophysics
Citations in the corpus
- The astrophysics of nanohertz gravitational waves (2018, background): “PTAs are sensitive to the polarization of GWs of any sufficiently bright source, including single sources, the stochastic background, etc. (Chatziioannou et al. 2012).”
- Tests of general relativity with the binary black hole signals from the LIGO-Virgo catalog GWTC-1 (2019, background): “In order to fully disentangle the polarization content of a transient signal, at least five detectors are needed to break all degeneracies [126].”