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PyGRB Injection Development
Issue: #3468
We want to move away from using lalapps_inspinj
to generate injection sets as xml
files, with all the complication that entails. Ideally, a single job should be able to produce the injections in a format that can be passed to the filtering code, with perhaps a second stage to apportion them for analysis.
Currently, the process is as follows:
-
lalapps_inspinj
creates a set of injections whose parameters are drawn from desired distributions, placed at a single sky point - Completed -
pycbc_dark_vs_bright_injections
sifts through these to select only those that meet an "EM-bright" criterion -
ligolw_cbc_jitter_skyloc
spreads the injections out on the sky to cover the GRB positional uncertainty region by drawing new sky positions from some localisation distribution - Completed -
ligolw_cbc_align_total_spin
takes the inclinationiota
of the binary (defined as the angle between line-of-sight and orbital angular momentum axis) and translates this so thattheta_jn
(the angle between line-of-sight and total angular momentum axis) takes the old value ofiota
-
pycbc_split_inspinj
takes the resulting injection files and divides the injections up into chunks for analysis to parallelise the computation
We believe all this should be possible in two steps:
-
pycbc_create_injections
to take care of steps 1–4 above -
pycbc_hdf5_splitbank
for step 5
In doing so, we will not only streamline the process but, importantly, can remove old dependencies on lalapps
and pylal
codes, as well as the constraints that come with using ligolw_xml
tables.
pycbc_create_injections
exists already and does (almost?) everything we might need it to.
- Currently use
pycbc_dark_vs_bright_injections
- Functions live in
em_progenitors.py
-
2H
EOS data live inequil_2H.dat
EM-bright condition is based upon the remnant mass
function.
Explicitly, we want a function in conversions.py
that goes from:
-
eta
: symmetric mass ratio -
ns_g_mass
: Gravitational mass of NS -
ns_sequence
[or potentiallyname
(see lalsuite module)] -
chi
: BH spin magnitude -
incl
: angle between BH spin vector and NS orbital plane
to remnant mass
(in solar masses)
- Will we keep anything under
tmpltbank
or move all the EM-bright stuff elsewhere? - What goes into
conversions.py
, and what (if anything) goes into a module for EM-bright (or more broadly NS physics) calculations?
PR: #3756
Use transforms.py
to perform this transformation when calling pycbc_create_injections