Direct current memory effects in effective-one-body waveform models

Understand

The direct current (DC) memory is a non-oscillatory, hereditary component of the gravitational wave (GW) signal that represents one of the most peculiar manifestations of the nonlinear nature of GW emission and propagation.

• In this work, by transforming the results provided in Ebersold et al.
• [Phys.Rev.D 100 (2019) 8, 084043] in harmonic coordinates and quasi-Keplerian parametrization, we provide the DC memory in terms of the effective-one-body (EOB) phase-space variables, with a relative accuracy of 2.5PN and in an expansion for small eccentricity up to order six.
• Our results are then implemented in TEOBResumS-Dal\'i, thus providing the first EOB model with DC memory contributions.