Precession effect of the gravitational self-force in a Schwarzschild spacetime and the effective one-body formalism

Precession effect of the gravitational self-force in a Schwarzschild spacetime and the effective one-body formalism

Using a recently presented numerical code for calculating the Lorenz-gauge gravitational self-force (GSF), we compute the O(m) conservative correction to the precession rate of the small-eccentricity orbits of a particle of mass m moving around a Schwarzschild black hole of mass M?m. Specifically, we study the gauge-invariant function ?(x), where ? is defined as the O(m) part of the dimensionless ratio (??r/???)2 between the squares of the radial and azimuthal frequencies of the orbit, and where x=[Gc-3(M+m)???]2/3 is a gauge-invariant measure of the dimensionless gravitational potential (mass over radius) associated with the mean circular orbit. Our GSF computation of the function ?(x) in the interval 0<x?1/6 determines, for the first time, the strong-field behavior of a combination of two of the basic functions entering the effective one-body (EOB) description of the conservative dynamics of binary systems. We show that our results agree well in the weak-field regime (small x) with the 3rd post-Newtonian (PN) expansion of the EOB results, and that this agreement is improved when taking into account the analytic values of some of the logarithmic-running terms occurring at higher PN orders. Furthermore, we demonstrate that GSF data give access to higher-order PN terms of ?(x) and can be used to set useful new constraints on the values of yet-undetermined EOB parameters. Most significantly, we observe that an excellent global representation of ?(x) can be obtained using a simple “2-point” Padé approximant which combines 3PN knowledge at x=0 with GSF information at a single strong-field point (say, x=1/6).

84036

Barack, Leor

f08e66d4-c2f7-4f2f-91b8-f2c4230d0298

Damour, Thibault

9e7fe76d-f668-4e67-a399-c806a02838d6

Sago, Norichika

c4baa9a1-e4fb-448e-8818-f7d189ed2773

15 October 2010

Barack, Leor

f08e66d4-c2f7-4f2f-91b8-f2c4230d0298

Damour, Thibault

9e7fe76d-f668-4e67-a399-c806a02838d6

Sago, Norichika

c4baa9a1-e4fb-448e-8818-f7d189ed2773

Barack, Leor, Damour, Thibault and Sago, Norichika
(2010)
Precession effect of the gravitational self-force in a Schwarzschild spacetime and the effective one-body formalism.
*Physical Review D*, 82 (8), .
(doi:10.1103/PhysRevD.82.084036).

## Abstract

Using a recently presented numerical code for calculating the Lorenz-gauge gravitational self-force (GSF), we compute the O(m) conservative correction to the precession rate of the small-eccentricity orbits of a particle of mass m moving around a Schwarzschild black hole of mass M?m. Specifically, we study the gauge-invariant function ?(x), where ? is defined as the O(m) part of the dimensionless ratio (??r/???)2 between the squares of the radial and azimuthal frequencies of the orbit, and where x=[Gc-3(M+m)???]2/3 is a gauge-invariant measure of the dimensionless gravitational potential (mass over radius) associated with the mean circular orbit. Our GSF computation of the function ?(x) in the interval 0<x?1/6 determines, for the first time, the strong-field behavior of a combination of two of the basic functions entering the effective one-body (EOB) description of the conservative dynamics of binary systems. We show that our results agree well in the weak-field regime (small x) with the 3rd post-Newtonian (PN) expansion of the EOB results, and that this agreement is improved when taking into account the analytic values of some of the logarithmic-running terms occurring at higher PN orders. Furthermore, we demonstrate that GSF data give access to higher-order PN terms of ?(x) and can be used to set useful new constraints on the values of yet-undetermined EOB parameters. Most significantly, we observe that an excellent global representation of ?(x) can be obtained using a simple “2-point” Padé approximant which combines 3PN knowledge at x=0 with GSF information at a single strong-field point (say, x=1/6).

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## More information

Published date: 15 October 2010

Organisations:
Applied Mathematics

## Identifiers

Local EPrints ID: 173673

URI: http://eprints.soton.ac.uk/id/eprint/173673

ISSN: 1550-7998

PURE UUID: 21a151b2-62ec-4cb8-9bc7-812e2ef1f773

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Date deposited: 07 Feb 2011 09:32

Last modified: 08 Oct 2019 00:46

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## Contributors

Author:
Thibault Damour

Author:
Norichika Sago

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