On-shell approach to scalar hair in spinning binaries
Abstract We propose an on-shell description of spinning binary systems in gravitational theories where compact objects display scalar hair. The framework involves matter particles of arbitrary spin which, in addition to the minimal coupling to gravitons, are conformally coupled to a massless scalar...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-05-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP05(2025)045 |
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| author | Adam Falkowski Panagiotis Marinellis |
| author_facet | Adam Falkowski Panagiotis Marinellis |
| author_sort | Adam Falkowski |
| collection | DOAJ |
| description | Abstract We propose an on-shell description of spinning binary systems in gravitational theories where compact objects display scalar hair. The framework involves matter particles of arbitrary spin which, in addition to the minimal coupling to gravitons, are conformally coupled to a massless scalar mediating non-standard interactions. We use the unitary factorization techniques to derive the on-shell amplitudes relevant for emission of scalars and gravitons in matter scattering, paying attention to parametrize the freedom due to contact terms. Using the KMOC formalism, these amplitudes allow one to derive succinct expressions for the radiation waveforms at the leading post-Minkowskian order, together with the associated memory effects. Furthermore, we compute the power emitted via gravitational and scalar radiation in hyperbolic encounters of compact objects. After a continuation to bound orbits, these are compared with results obtained in specific scalar-tensor theories where black holes exhibit scalar hair, such as the scalar-Gauss-Bonnet or dynamical Chern-Simons theories. Finally, we identify possible deformations from the conformal coupling that can contribute to radiation observables at the same post-Newtonian order. |
| format | Article |
| id | doaj-art-e6570aacfafe4a52bb6298ad2761b94d |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-e6570aacfafe4a52bb6298ad2761b94d2025-08-20T03:25:15ZengSpringerOpenJournal of High Energy Physics1029-84792025-05-012025514110.1007/JHEP05(2025)045On-shell approach to scalar hair in spinning binariesAdam Falkowski0Panagiotis Marinellis1Université Paris-Saclay, CNRS/IN2P3, IJCLabUniversité Paris-Saclay, CNRS/IN2P3, IJCLabAbstract We propose an on-shell description of spinning binary systems in gravitational theories where compact objects display scalar hair. The framework involves matter particles of arbitrary spin which, in addition to the minimal coupling to gravitons, are conformally coupled to a massless scalar mediating non-standard interactions. We use the unitary factorization techniques to derive the on-shell amplitudes relevant for emission of scalars and gravitons in matter scattering, paying attention to parametrize the freedom due to contact terms. Using the KMOC formalism, these amplitudes allow one to derive succinct expressions for the radiation waveforms at the leading post-Minkowskian order, together with the associated memory effects. Furthermore, we compute the power emitted via gravitational and scalar radiation in hyperbolic encounters of compact objects. After a continuation to bound orbits, these are compared with results obtained in specific scalar-tensor theories where black holes exhibit scalar hair, such as the scalar-Gauss-Bonnet or dynamical Chern-Simons theories. Finally, we identify possible deformations from the conformal coupling that can contribute to radiation observables at the same post-Newtonian order.https://doi.org/10.1007/JHEP05(2025)045Black HolesScattering Amplitudes |
| spellingShingle | Adam Falkowski Panagiotis Marinellis On-shell approach to scalar hair in spinning binaries Journal of High Energy Physics Black Holes Scattering Amplitudes |
| title | On-shell approach to scalar hair in spinning binaries |
| title_full | On-shell approach to scalar hair in spinning binaries |
| title_fullStr | On-shell approach to scalar hair in spinning binaries |
| title_full_unstemmed | On-shell approach to scalar hair in spinning binaries |
| title_short | On-shell approach to scalar hair in spinning binaries |
| title_sort | on shell approach to scalar hair in spinning binaries |
| topic | Black Holes Scattering Amplitudes |
| url | https://doi.org/10.1007/JHEP05(2025)045 |
| work_keys_str_mv | AT adamfalkowski onshellapproachtoscalarhairinspinningbinaries AT panagiotismarinellis onshellapproachtoscalarhairinspinningbinaries |