http://arxiv.org/abs/2305.05844
The propagation of gravitational waves can reveal fundamental features of the structure of space-time. For instance, differences in the propagation of gravitational-wave polarizations would be a smoking gun for parity violations in the gravitational sector, as expected from birefringent theories like Chern-Simons gravity. Here we look for evidence of amplitude birefringence in the latest LIGO-Virgo catalog (GWTC-3) through the use of birefringent templates inspired by dynamical Chern-Simons gravity. From 71 binary-black-hole signals, we obtain the most precise constraints on gravitational-wave amplitude birefringence yet, measuring a birefringent attenuation of $\kappa = – 0.019^{+0.038}{-0.029}\, \mathrm{Gpc}^{-1}$ at 100 Hz with 90% credibility, equivalent to a parity-violation energy scale of $M{PV} \gtrsim 6.8\times 10^{-21}\, \mathrm{GeV}$.
T. Ng, M. Isi, K. Wong, et. al.
Thu, 11 May 23
3/55
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