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Add spin from pulsar frequency to conversions #3432

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merged 2 commits into from
Aug 26, 2020
Merged

Add spin from pulsar frequency to conversions #3432

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register the new function
Aug 26, 2020
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Aug 26, 2020
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23 changes: 22 additions & 1 deletion pycbc/conversions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -643,6 +643,27 @@ def dquadmon_from_lambda(lambdav):
ln_quad_moment = ai + bi*ll + ci*ll**2.0 + di*ll**3.0 + ei*ll**4.0
return numpy.exp(ln_quad_moment) - 1


def spin_from_pulsar_freq(mass, radius, freq):
"""Returns the dimensionless spin of a pulsar.

Assumes the pulsar is a solid sphere when computing the moment of inertia.

Parameters
----------
mass : float
The mass of the pulsar, in solar masses.
radius : float
The assumed radius of the pulsar, in kilometers.
freq : float
The spin frequency of the pulsar, in Hz.
"""
omega = 2 * numpy.pi * freq
mt = mass * lal.MTSUN_SI
mominert = (2/3.) * mt * (radius * 1000 / lal.C_SI)**2
return mominert * omega / mt**2


#
# =============================================================================
#
Expand Down Expand Up @@ -1512,5 +1533,5 @@ def nltides_gw_phase_diff_isco(f_low, f0, amplitude, n, m1, m2):
'final_mass_from_initial', 'final_spin_from_initial',
'optimal_dec_from_detector', 'optimal_ra_from_detector',
'chi_eff_from_spherical', 'chi_p_from_spherical',
'nltides_gw_phase_diff_isco',
'nltides_gw_phase_diff_isco', 'spin_from_pulsar_freq',
]