CosmoFit.ACTDR6LensingLikelihood

class CosmoFit.ACTDR6LensingLikelihood(cosmology, version='act_baseline', lens_potential_accuracy=4)[source]

Bases: BaseLikelihood

ACT DR6 lensing bandpowers against a Boltzmann-computed C_L^{kappakappa}.

Parameters:

  • cosmology – Cosmology model instance. Must be one CAMB can represent.

  • version (str, optional) – "act_baseline" (default, 40 <= L <= 763) or "act_extended" (out to L < 1250). ACT’s own baseline is the first; the extended range includes multipoles whose systematics they flag as less well controlled.

  • lens_potential_accuracy (int, optional) – CAMB’s lensing accuracy. ACT recommend 4 or higher, which is the default here.

Notes

Combining with "planck_lensing" is not double-counting – different telescopes, different skies – but the two are not perfectly independent either, since ACT’s map overlaps Planck’s on the sky. ACT provide a proper joint variant (actplanck_*) for exactly this; it is not implemented here, so combining the two separate likelihoods slightly overstates the joint constraint. Fitter warns.

__init__(cosmology, version='act_baseline', lens_potential_accuracy=4)[source]
Parameters:

  • version (str)

  • lens_potential_accuracy (int)

Methods

__init__(cosmology[, version, ...])

chi2()

Chi-square statistic.

log_likelihood()

Return log-likelihood.

model()

Predicted lensing bandpowers.

predictions()

Alias for model().

residuals()

Data minus model bandpower residuals.

summary()

Return a summary of the likelihood evaluation.

Attributes

n_data

Number of data points.

name_and_size

Name together with the number of data points.

observable