lalsimulation.nrfits.pn_spin_evolution_wrapper Namespace Reference

Functions
def	spin_evolution (q, chiA0, chiB0, omega0, approximant='SpinTaylorT4', dt=0.1, spinO=6, phaseO=7)
	Wrapper for PN spin and dynamics evolution in LAL. More...

Function Documentation

spin_evolution()

def lalsimulation.nrfits.pn_spin_evolution_wrapper.spin_evolution	(		q,
			chiA0,
			chiB0,
			omega0,
			approximant = 'SpinTaylorT4',
			dt = 0.1,
			spinO = 6,
			phaseO = 7
	)

Wrapper for PN spin and dynamics evolution in LAL.

Inputs:

• q: Mass ratio (q>=1)
• chiA0: Dimensionless spin of BhA at initial freq.
• chiB0: Dimensionless spin of BhB at initial freq.
• omega0: Initial orbital frequency in dimensionless units.
• approximant: 'SpinTaylorT1/T4/T5'. Default: SpinTaylorT4.
• dt: Dimensionless step time for evolution. Default: 0.1
• spinO: Twice PN order of spin effects. Default: 7.
• phaseO: Twice PN order in phase. Default: 7.

Outputs (all are time series):

• Omega: Dimensionless orbital frequency.
• Phi: Orbital phase (radians)
• ChiA: Dimensionless spin of BhA
• ChiB: Dimensionless spin of BhB
• LNhat: Orbital angular momentum direction
• E1: Orbital plane basis vector

The frame is defined at the initial frequency omega0, as follows:

• z-axis is set by the orbital angular momentum direction.
• x-axis is the separation vector from the lighter BH to the heavier BH.
• y-axis completes the triad by right-hand rule.
  All quantities are defined in this fixed frame, including initial spins, returned spins, other vectors like LNhat, etc.

Definition at line 32 of file pn_spin_evolution_wrapper.py.