Scalar-tensor mixed polarization search of gravitational waves

Abstract

An additional scalar degree of freedom for a gravitational wave is often predicted in theories of gravity beyond general relativity and can be used for a model-agnostic test of gravity. In this letter, we report the direct search for the scalar-tensor mixed polarization modes of gravitational waves from compact binaries in a strong regime of gravity by analyzing the data of GW170814 and GW170817, which are the merger events of binary black holes and binary neutron stars, respectively. Consequently, we obtain the constraints on the ratio of scalar-mode amplitude to tensor-mode amplitude: $\lesssim 0.20$ for GW170814 and $\lesssim 0.068$ for GW170817, which are the tightest constraints on the scalar amplitude in a strong regime of gravity before merger.

6 pages, 3 figures

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• Effective Gravitational Wave Stress-energy Tensor in Alternative Theories of Gravity
• Pure polarization test of GW170814 and GW170817 using waveforms consistent with modified theories of gravity
• A morphology-independent test of the mixed polarization content of gravitational wave signals from compact binary coalescences

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• Constraining Horndeski theory with gravitational waves from coalescing binaries
• Gravitational-wave constraints on scalar-tensor gravity from a neutron star and black-hole binary GW200115
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• Searching for Majorana quasiparticles at vortex cores in iron-based superconductors
• Measuring the maximally allowed polarization states of the isotropic stochastic gravitational wave background with the ground-based detectors
• Fundamental Physics and Cosmology with TianQin
• Scalar polarization window in gravitational-wave signals
• Prospects of constraining on the polarizations of gravitational waves from binary black holes using space- and ground-based detectors
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• Unveiling the existence of nontensorial gravitational-wave polarizations from individual supermassive black hole binaries with pulsar timing arrays
• Statistical biases in parametrized searches for gravitational-wave polarizations
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• Tests of scalar polarizations with multi-messenger events
• Multi-detector characterization of gravitational-wave burst tensor polarizations with the BayesWave algorithm
• Gravitational waves in Cubic Metric-Affine Gravity
• Hawking area law in quantum gravity