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FEAT: add precessing spin transformation#1104

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ColmTalbot wants to merge 1 commit into
bilby-dev:mainfrom
ColmTalbot:precessing-spin-transform
Open

FEAT: add precessing spin transformation#1104
ColmTalbot wants to merge 1 commit into
bilby-dev:mainfrom
ColmTalbot:precessing-spin-transform

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@ColmTalbot

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This is a replacement for #1044 that includes the backend changes rather than attempting to rebase.

@ColmTalbot ColmTalbot requested a review from a team June 26, 2026 16:04
@ColmTalbot ColmTalbot added enhancement New feature or request >100 lines labels Jun 26, 2026

@GregoryAshton GregoryAshton left a comment

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Broadly looks good to me - albeit the checks are failing

Comment thread bilby/gw/geometry.py
return theta, phi


def transform_precessing_spins(

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This is overwriting an existing function with a properly vectorised version if I have understood correctly. Typically, I'd think it would be better to use a new name. However, I can see there are tests to ensure the two agree.. so I'm inclined to say this seems like a good idea.

Comment thread bilby/gw/geometry.py
- spin_2x, spin_2y, spin_2z: Components of spin 2
"""

xp = array_module(theta_jn)

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Does array_module here just take theta_jn to figure out the array type?

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