Assessment of effective-one-body radiation reactions for generic planar orbits
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Assessment of effective-one-body radiation reactions for generic planar orbits. / Albanesi, Simone; Nagar, Alessandro; Bernuzzi, Sebastiano; Placidi, Andrea; Orselli, Marta.
In: Physical Review D, Vol. 105, No. 10, 104031, 17.05.2022.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Assessment of effective-one-body radiation reactions for generic planar orbits
AU - Albanesi, Simone
AU - Nagar, Alessandro
AU - Bernuzzi, Sebastiano
AU - Placidi, Andrea
AU - Orselli, Marta
PY - 2022/5/17
Y1 - 2022/5/17
N2 - In this paper, we assess the performances of different analytical prescriptions for the effective-one-body (EOB) radiation reaction along generic planar orbits using exact numerical result in the test-mass limit. We consider three prescriptions put forward in the recent literature: (i) the quasicircular prescription (QC), (ii) the QC with second post-Newtonian (2PN) order noncircular corrections (QC2PN), and (iii) the QC corrected by the noncircular Newtonian prefactor (NCN). The analytical fluxes are then compared against the exact fluxes that are computed by solving the Teukolsky equation with a test-mass source in geodesic motion. We find that the NCN prescription is the most accurate for both eccentric and hyperbolic orbits, and it is in robust agreement also for large values of the eccentricity. This result carries over to the comparable masses, as we discuss for a numerical-relativity (NR) case study. We also demonstrate that, while the EOB/NR waveform unfaithfulness is a necessary check for the precision of EOB models, the direct comparison of EOB/NR fluxes is a more stringent and informative test to select the best prescription. Finally, we propose an improved radiation reaction, NCN2PN, that includes noncircular 2PN corrections, in resummed form, as a further multiplicative contribution and that is valid for any mass ratio.
AB - In this paper, we assess the performances of different analytical prescriptions for the effective-one-body (EOB) radiation reaction along generic planar orbits using exact numerical result in the test-mass limit. We consider three prescriptions put forward in the recent literature: (i) the quasicircular prescription (QC), (ii) the QC with second post-Newtonian (2PN) order noncircular corrections (QC2PN), and (iii) the QC corrected by the noncircular Newtonian prefactor (NCN). The analytical fluxes are then compared against the exact fluxes that are computed by solving the Teukolsky equation with a test-mass source in geodesic motion. We find that the NCN prescription is the most accurate for both eccentric and hyperbolic orbits, and it is in robust agreement also for large values of the eccentricity. This result carries over to the comparable masses, as we discuss for a numerical-relativity (NR) case study. We also demonstrate that, while the EOB/NR waveform unfaithfulness is a necessary check for the precision of EOB models, the direct comparison of EOB/NR fluxes is a more stringent and informative test to select the best prescription. Finally, we propose an improved radiation reaction, NCN2PN, that includes noncircular 2PN corrections, in resummed form, as a further multiplicative contribution and that is valid for any mass ratio.
KW - BLACK-HOLE MERGER
KW - GRAVITATIONAL-RADIATION
KW - EQUATIONS
KW - PARTICLE
U2 - 10.1103/PhysRevD.105.104031
DO - 10.1103/PhysRevD.105.104031
M3 - Journal article
VL - 105
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 10
M1 - 104031
ER -
ID: 315473957