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Scattering of spinning compact objects from a worldline EFT
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.ORCID iD: 0000-0003-1398-4144
2024 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2024, no 3, article id 108Article in journal (Refereed) Published
Abstract [en]

We study the EFT of a spinning compact object and show that with appropriate gauge fixing, computations become amenable to worldline quantum field theory techniques. We use the resulting action to compute Compton and one-loop scattering amplitudes at fourth order in spin. By matching these amplitdes to solutions of the Teukolsky equations, we fix the values of Wilson coefficients appearing in the EFT such that it reproduces Kerr black hole scattering. We keep track of the spin supplementary condition throughout our computations and discuss alternative ways to ensure its preservation.

Place, publisher, year, edition, pages
Springer, 2024. Vol. 2024, no 3, article id 108
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:uu:diva-525573DOI: 10.1007/jhep03(2024)108OAI: oai:DiVA.org:uu-525573DiVA, id: diva2:1846598
Funder
Knut and Alice Wallenberg Foundation, KAW 2018.0116Knut and Alice Wallenberg Foundation, KAW 2018.0162Available from: 2024-03-24 Created: 2024-03-24 Last updated: 2024-03-25Bibliographically approved
In thesis
1. Color-Kinematics Duality and Gravitational Waves
Open this publication in new window or tab >>Color-Kinematics Duality and Gravitational Waves
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Recent developments in theoretical physics have led to new insights for gauge theory and gravity scattering amplitudes.The color-kinematics duality, in particular, describes an intriguing set of identities obeyed by the kinematic numerators of gauge-theory scattering amplitudes, mirroring the Jacobi identity of the color factors.  The kinematic Jacobi identities suggest the existence of some unknown kinematic algebra underlying the gauge-theory Feynman rules. However, as of yet, there is no complete Lagrangian construction of duality-satisfying numerators, nor an off-shell realization of a kinematic algebra even for pure Yang-Mills gauge theory. This thesis presents substantial progress on these open problems, first through a Lagrangian whose Feynman rules compute duality-satisfying numerators in the NMHV sector of Yang-Mills theory. In addition, Chern-Simons gauge theory is shown to obey the color-kinematics duality completely off shell, giving rise to a kinematic algebra of volume preserving diffeomorphisms. Similar structures are also identified in the pure-spinor description of super Yang-Mills theory.

The recent detection of gravitational waves by the LIGO/Virgo/KAGRA collaboration, as well as anticipated improvement in sensitivity of future detectors, call for improved precision of the theoretical predictions for binary merger events. Analytical computations involving gravitating and rotating compact objects require both increased classical loop orders in the gravitational coupling as well as the incorporation of spin effects, which have important contributions to the dynamics. For this purpose, an extension of the worldline quantum field theory is presented, based on the effective worldline action of a classical spinning compact object. The formalism is used to compute tree and one-loop amplitudes up to fourth order in spin, and coefficients in the effective worldline action are fixed such that it reproduces known Kerr observables from black hole perturbation theory.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2024. p. 68
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 2378
Keywords
Quantum field theory, gravitational waves, scattering amplitudes
National Category
Other Physics Topics
Research subject
Theoretical Philosophy
Identifiers
urn:nbn:se:uu:diva-525574 (URN)978-91-513-2078-6 (ISBN)
Public defence
2024-05-16, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:00 (English)
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Supervisors
Available from: 2024-04-23 Created: 2024-03-24 Last updated: 2024-04-23

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Ben-Shahar, Maor

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