Kavli Affiliate: Lijing Shao
| First 5 Authors: , , , ,
| Summary:
In General Relativity, there are only two polarizations for gravitational
waves. However, up to six polarizations are possible in a generic metric theory
of gravity. Therefore, measuring the polarization content of gravitational
waves provides an efficient way to test theories of gravity. We analyze the
sensitivity of a next-generation ground-based detector network to nontensorial
polarizations. We present our method to localize GW signals in the
time-frequency domain and construct the null stream for events with known sky
locations. We obtain results based on simulations of binary neutron star
mergers in a five-detector network. For a single event at a luminosity distance
$D_L=100$ Mpc, the smallest amplitude for detection of scalar and vector modes
relative to tensor modes are respectively $A_{s}=0.04$ and $A_{v}=0.013$. For
multiple events in an averaged observing run of 10 years, the detection limits
are $A_s=0.05$ and $A_v=0.02$. If we are fortunate, a few strong events might
significantly improve the limits.
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