def mchirp_mass1_to_mass2(mchirp, mass1):
"""
This function takes a value of mchirp and one component mass and returns
the second component mass. As this is a cubic equation this requires
finding the roots and returning the one that is real.
Basically it can be shown that:
m2^3 - a(m2 + m1) = 0
where
a = Mc^5 / m1^3
this has 3 solutions but only one will be real.
"""
return conversions.mass2_from_mchirp_mass1(mchirp, mass1)
def mchirp_mass1_to_mass2(mchirp, mass1):
"""
This function takes a value of mchirp and one component mass and returns
the second component mass. As this is a cubic equation this requires
finding the roots and returning the one that is real.
Basically it can be shown that:
m2^3 - a(m2 + m1) = 0
where
a = Mc^5 / m1^3
this has 3 solutions but only one will be real.
"""
return conversions.mass2_from_mchirp_mass1(mchirp, mass1)