Scattering of gravitational waves off spinning compact objects with an effective worldline theory

Saketh, M. V. S.; Vines, Justin

doi:10.1103/physrevd.106.124026

Cited by 28 publications

(26 citation statements)

References 81 publications

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“…The remaining helicity configurations can be obtained by replacing S ab → −S ab , s a → −s a . The above results are in agreement with [33] up to quadratic in spin upon matching with our conventions.…”

Section: Jhep03(2023)068supporting

confidence: 89%

“…In QED we have tested the validity of our approach up to 7-point, while in gravity we have verified that the N = 2 susy model correctly reproduces the classical Compton amplitude up to quadrupole finding agreement with ref. [33]. For colored scalars and QCD, we have applied our methods to obtain HTLs, which are related to the classical limit of off-shell currents [66].…”

Section: Discussionmentioning

confidence: 99%

“…[29]. The n = 2 current with spinning massive particles is relevant in the context of ongoing discussions of higher spin gravitational Compton amplitudes in the classical limit [30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Jhep03(2023)068mentioning

confidence: 99%

“…In ref [33]. a direct classical calculation of the Compton amplitude has been done using the worldline effective theory including cubic in spin corrections.…”

mentioning

confidence: 99%

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Classical off-shell currents

Comberiati

Cruz

2023

J. High Energ. Phys.

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We consider tree-level off-shell currents of two massive particles and n massless bosons in the classical limit, which can be fused into the classical limit of n + 2 scattering amplitudes. We show that dressing up the current with coherent wave-functions associated with the massive particles leads to the recently proposed Worldline Quantum Field Theory (WQFT) path integral. The currents thus constructed encode solutions of classical equations of motion so they can be applied to contexts where the classical limit is relevant, including hard thermal loops. We give several examples of these currents in scalar, gauge and gravitational theories.

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Section: Jhep03(2023)068supporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Jhep03(2023)068mentioning

confidence: 99%

“…In ref [33]. a direct classical calculation of the Compton amplitude has been done using the worldline effective theory including cubic in spin corrections.…”

mentioning

confidence: 99%

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Classical off-shell currents

Comberiati

Cruz

2023

J. High Energ. Phys.

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“…Certain serendipitous cancellations occur in the recursive construction of the black-hole Compton amplitude, 1 allowing one to build this amplitude using only leading-in-information throughout the computation. As we will see below, this fortune does not extend to the case of general objects, where subleading-ininformation is needed in intermediate steps to match to known classical results [66].…”

mentioning

confidence: 99%

Recursion in the classical limit and the neutron-star Compton amplitude

Haddad¹

2023

Preprint

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We study the compatibility of recursive techniques with the classical limit of scattering amplitudes through the construction of the classical Compton amplitude for general spinning compact objects. This is done using BCFW recursion on three-point amplitudes expressed in terms of the classical spin vector and tensor, and expanded to nextto-leading-order in by using the heavy on-shell spinors. Matching to the result of classical computations, we find that lower-point quantum contributions are, in general, required for the recursive construction of classical, spinning, higher-point amplitudes with massive propagators. We are thus led to conclude that BCFW recursion and the classical limit do not commute. In possession of the classical Compton amplitude, we remove non-localities to all orders in spin for opposite graviton helicities, and to fifth order in the same-helicity case. Finally, all possible on-shell contact terms potentially relevant to black-hole scattering at the second post-Minkowskian order are enumerated and written explicitly.

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Absorptive effects and classical black hole scattering

Jones,

Ruf

2024

J. High Energ. Phys.

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We describe an approach to incorporating the physical effects of the absorption of energy by the event horizon of black holes in the scattering amplitudes based post-Minkowskian, point-particle effective description. Absorptive dynamics are incorporated in a model-independent way by coupling the usual point-particle description to an invisible sector of gapless internal degrees-of-freedom. The leading order dynamics of this sector are encoded in the low-energy expansion of a spectral density function obtained by matching an absorption cross section in the ultraviolet description. This information is then recycled using the scattering amplitudes based Kosower-Maybee-O’Connell in-in formalism to calculate the leading absorptive contribution to the impulse and change in rest mass of a Schwarzschild black hole scattering with a second compact body sourcing a massless scalar, electromagnetic or gravitational field. The results obtained are in complete agreement with previous worldline Schwinger-Keldysh calculations and provide an alternative on-shell scattering amplitudes approach to incorporating horizon absorption effects in the gravitational two-body problem.

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Scattering of gravitational waves off spinning compact objects with an effective worldline theory

Cited by 28 publications

References 81 publications

Classical off-shell currents

Classical off-shell currents

Recursion in the classical limit and the neutron-star Compton amplitude

Absorptive effects and classical black hole scattering

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