Gravitational Waves from Inspiralling Compact Binaries in ... - LUTH

Validity of Results
Circular orbits above the LSO, in the presence of GRR, can
be described as an adiabatic sequence of circular orbits.
Approximation breaks down when the binary reaches the
LSO, at which point the orbital motion changes into a kind of
plunge.
For inspiralling eccentric orbits, evolving under GRR, our
treatment can only be valid above an eccentric analog of
the LSO, i.e. stable eccentric orbits (separated by a potential
barrier from any plunge motion)
To delineate them one can use the non-perturbative
effective one body (EOB) formalism, because the transition
between bound and plunge orbits has a non-perturbative,
strong-field origin.
BRI-IHP06-I – p.155/??