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Update o3a review report authored by NV Krishnendu's avatar NV Krishnendu
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O3a-Spin-Quadrupole-BH-mimicker-test-results/o3a-review-report.md
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* We notice significant differences between our BBH runs and these runs. We find that some of the spin angles are consistently different. In particular, the behavior of \phi_JL seems to be consistently "out-of-phase" indicating that this is a change in the spin convention. More than this, `logL`, `D_L`, `theta_{JN}`, `matched filter `SNRs` are different. The log BFs show a difference of (maximum) `~ \pm2` * We notice significant differences between our BBH runs and these runs. We find that some of the spin angles are consistently different. In particular, the behavior of \phi_JL seems to be consistently "out-of-phase" indicating that this is a change in the spin convention. More than this, `logL`, `D_L`, `theta_{JN}`, `matched filter `SNRs` are different. The log BFs show a difference of (maximum) `~ \pm2`
* After seeking help from the waveform group we found the following changes recently happened to the LALSuite versions, and those could lead to a difference in the estimates. * After seeking help from the waveform group we found the following changes recently happened to the LALSuite versions, and those could lead to a difference in the estimates.
* The waveforms changed conventions of the frame in which the spin components are specified: the in-plane spin components get rotated by the orbital phase. See https://dcc.ligo.org/LIGO-T1800226 for a summary. * The waveforms changed conventions of the frame in which the spin components are specified: the in-plane spin components get rotated by the orbital phase. See https://dcc.ligo.org/LIGO-T1800226 for a summary.
* Inconsistencies found on the definition of polarization angle and angles between J and L, and found some between LAL and the paper arXiv:0810.5336 (mentioned [here](https://git.ligo.org/lscsoft/lalsuite/-/blob/master/lalsimulation/lib/LALSimIMRPhenomP.c#L426). This has been fixed, see the [commit](https://git.ligo.org/lscsoft/lalsuite/-/commit/241bb313c92ffcb8aec56f37bd21b45b47fe49bb#8685376c620e361391063ea46252790c20301a0f). This led to a difference in the polarizations as mentioned [here](https://git.ligo.org/lscsoft/lalsuite/-/blob/master/lalsimulation/lib/LALSimInspiral.c#L1881). * Inconsistencies found on the definition of polarization angle and angles between J and L, and found some between LAL and the paper arXiv:0810.5336 mentioned [here](https://git.ligo.org/lscsoft/lalsuite/-/blob/master/lalsimulation/lib/LALSimIMRPhenomP.c#L426). This has been fixed, see the [commit](https://git.ligo.org/lscsoft/lalsuite/-/commit/241bb313c92ffcb8aec56f37bd21b45b47fe49bb#8685376c620e361391063ea46252790c20301a0f). This led to a difference in the polarizations as mentioned [here](https://git.ligo.org/lscsoft/lalsuite/-/blob/master/lalsimulation/lib/LALSimInspiral.c#L1881).
* Along with the spin convention changes in LALSimulation, there is another difference from the LALInference distance bugfix. GW170104 is one of the more distant events, where the bug(fix) has an appreciable effect. * Along with the spin convention changes in LALSimulation, there is another difference from the LALInference distance bugfix. GW170104 is one of the more distant events, where the bug(fix) has an appreciable effect.
* Above mentioned changes can lead to the differences we see in the posteriors. * Above mentioned changes can lead to the differences we see in the posteriors.
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