ACME - Multi-Messenger Inference with Bilby: From Gravitational Waves to the Hubble Constant
Monday, 14 December 2026 -
09:30
Monday, 14 December 2026
09:30
Welcome, ACME introduction, environment check
-
Giancarlo Cella
(
INFN Pisa
)
Welcome, ACME introduction, environment check
Giancarlo Cella
(
INFN Pisa
)
09:30 - 09:45
ACME project slides; check of the Python environment.
09:45
Lecture: combining observations and standard sirens
-
Giancarlo Cella
(
INFN Pisa
)
Lecture: combining observations and standard sirens
Giancarlo Cella
(
INFN Pisa
)
09:45 - 10:30
Distance-inclination degeneracy; joint inference with shared parameters; reusing posterior samples (reweighting, KDE likelihoods) and double counting; standard sirens, peculiar velocities, priors on D_L and H0; selection effects.
10:30
Lab 1: the distance-inclination degeneracy
-
Giancarlo Cella
(
INFN Pisa
)
Lab 1: the distance-inclination degeneracy
Giancarlo Cella
(
INFN Pisa
)
10:30 - 11:00
01_distance_inclination.py: toy amplitude model sampled with Bilby, compared with GW170817-like posterior samples.
11:00
Lab 2: an electromagnetic constraint on the viewing angle
-
Giancarlo Cella
(
INFN Pisa
)
Lab 2: an electromagnetic constraint on the viewing angle
Giancarlo Cella
(
INFN Pisa
)
11:00 - 11:45
02_em_viewing_angle.py: reweighting and joint Bilby run; the two forms of double counting; jet misalignment.
11:45
Break
Break
11:45 - 12:00
12:00
Lab 3: the Hubble constant from one event
-
Giancarlo Cella
(
INFN Pisa
)
Lab 3: the Hubble constant from one event
Giancarlo Cella
(
INFN Pisa
)
12:00 - 12:55
03_hubble.py: H0 from GW only and GW+EM; peculiar velocities, distance and H0 priors; joint sampling over (H0, D_L, cos theta_JN, v_p).
12:55
Lab 4: many sirens and the selection effect
-
Giancarlo Cella
(
INFN Pisa
)
Lab 4: many sirens and the selection effect
Giancarlo Cella
(
INFN Pisa
)
12:55 - 13:15
04_siren_population.py: scaling with the number of events; bias from neglecting selection effects.
13:15
Wrap-up and closing discussion
-
Giancarlo Cella
(
INFN Pisa
)
Wrap-up and closing discussion
Giancarlo Cella
(
INFN Pisa
)
13:15 - 13:30
Dark and spectral sirens, systematics that do not average away; ticketing system and survey.