Metadata
The metadata provided with these simulations can be divided into two broad categories: the metadata required to reproduce the simulation and the physical metadata.
Physical metadata
The physical metadata contain the properties of the initial black holes at a relaxed time, corresponding to an orbital frequency. They also contain the remnant quantites and details about the length of the waveform.
object-1 : nature of the lighter object (e.g. ‘BH’ indicates this object is black hole)
object-2 : nature of the heavier object
mass1-relaxed : mass of the lighter object at the relaxed time
mass2-relaxed : mass of the heavier object at the relaxed time
chi1-relaxed : dimensionless spin of the lighter object (given as a vector in Cartesian co-ordinates)
chi2-relaxed : dimensionless spin of the heavier object (given as a vector in Cartesian co-ordinates)
r1-relaxed : position of the lighter object (given as a vector in Cartesian co-ordinates)
r2-relaxed : position of the heavier object (given as a vector in Cartesian co-ordinates)
p1-relaxed : momentum of the lighter object (given as a vector in Cartesian co-ordinates)
p2-relaxed : momentum of the lighter object (given as a vector in Cartesian co-ordinates)
LN-relaxed : Newtionan angular momentum of the binary (given as a vector in Cartesian co-ordinates)
Mf : mass of the remnant object
chif : dimensionless spin of the remnant object (given as a vector in Cartesian co-ordinates)
vR : kick velocity of the remnant object (given as a vector in Cartesian co-ordinates)
Omega : orbital angular frequency at the relaxed time
Norb : number of orbits from the relaxed time before merger
eccentricity : eccentricity of the binary
mean-anomaly : mean anomaly of the binary (set to zero for quasi-circular binaries)
tR: relaxed time
tM : merger time
NR metadata
The NR metadata contains the initial-data parameters for the simulation and the basic grid information. For further information on the grid structure, see Sec. II of the arXiv: and references therein.
mass1-initial : mass of the lighter object
mass2-initial : mass of the heavier object
S1-initial : spin of the lighter object (given as a vector in Cartesian co-ordinates)
S2-initial : spin of the heavier object (given as a vector in Cartesian co-ordinates)
r1-initial : position of the lighter object (given as a vector in Cartesian co-ordinates)
r2-initial : position of the heavier object (given as a vector in Cartesian co-ordinates)
p1-initial : momentum of the lighter object (given as a vector in Cartesian co-ordinates)
p2-initial : momentum of the lighter object (given as a vector in Cartesian co-ordinates)
N : list of box sizes
d0 : resolution on the coarsest level
extraction-radii : list of available extraction radii with this dataset
max-levels-1 : number of levels around lighter object
max-levels-2 : number of levels around heavier object
initial-adm-energy : initial ADM energy of the spacetime
Additional metadata
simulation-ID : number corresponding to catalogue identification
name : locally used simulation name
Data sets
For a demonstration on how to extract the data from the h5 files, see this example notebook. For more information on how each of the following quantities are calculated, see arXiv:.
Waveform data
We provide the \(\Psi_4\) multipole moment data up to \(\ell=5\). The minimal dataset contains only data at a single extraction radius, which is the one we recommend for use. The complete dataset contains the data for each of the extraction radii available. We provide the waveform extracted at the finest resolution available for each extraction radius. Each multipole moment for a given extraction radius is stored as a time series of the real and imaginary parts of \(\psi_{4,\ell m}\).
Horizon data
The horizon data contains information on the mass, spin and position of each of the objects as a time series. The spin and position are provided as vectors in Cartesian co-ordinates.
Moving puncture data
The moving puncture data contains the position and velocity of each of the objects as a time series. These are provided as vectors in Cartesian co-ordinates.
Radiated energy and momenta
We provide the time derivative of the radiated energy and the time derivative of the {x,y,z} components of the linear momentum as a time series.