GWTC1-O3a-differences.md

+---------- Forwarded message ---------
+From: Archisman Ghosh <archisman.ghosh@lorentz.leidenuniv.nl>
+Date: Wed, 24 Jun 2020 at 12:29
+Subject: Spin convention change between GWTC-1 and O3a
+To: Riccardo Sturani <riccardo@iip.ufrn.br>, Frank Ohme <frank.ohme@aei.mpg.de>, Sebastian Khan <KhanS22@cardiff.ac.uk>, Maria Haney <mhaney@physik.uzh.ch>, Harald Pfeiffer <harald.pfeiffer@aei.mpg.de>
+Cc: Abhirup Ghosh <abhirup.ghosh@aei.mpg.de>, Anuradha Gupta <anuradha1bhu@gmail.com>, Saleem Muhammed <saleem.muhammed.c@gmail.com>, Krishnendu Naderi Varium <krnava@aei.mpg.de>
+
+
+Hi Riccardo, Frank, Seb, Maria, Harald,
+
+I also asked the following question on the PE chat, but I think that as 
+waveform experts you would have a better idea.
+
+For review of the spin-induced quadrupole moment test to go into the 
+O3a-TGR paper, we are looking at comparison of LALInference results (GR 
+runs using BBH waveforms, performed using a TGR branch based off the 
+current LALInference) with older runs performed in 2018 for GWTC-1 (e.g. 
+CIT: 
+/home/jacob.lange/public_html/LALInference/O2_PE/C02-cleaned-final/G297595-C02-cleaned-H1L1V1-IMRPv2-rererun/lalinferencenest/IMRPhenomPv2pseudoFourPN/1186741861.53-0/V1H1L1/).
+
+We are finding that some of the spin angles are consistently different. 
+In particular, the behaviour of \phi_JL seems to be consistently 
+"out-of-phase" indicating that this is a change in the spin convention. 
+Is our understanding correct?
+
+An example PE comparison page is linked below.
+
+https://ldas-jobs.ligo.caltech.edu/~nv.krishnendu/LSC/lalinference/O3/o3_a_tgr/O1_O2/GW170104_G268556/pv2_c01_prod/comp_PE_Prod0_cbcBayesCompPos/bh_bh_comp/
+
+Thanks a lot for your help!
+
+Best regards,
+Krishnendu, Saleem, Abhirup, Anuradha, Archisman.
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