The SAGEX Review on Scattering Amplitudes

Travaglini, Gabriele; Brandhuber, Andreas; Dorey, Patrick; McLoughlin, Tristan; Abreu, Samuel; Bern, Zvi; Bjerrum-Bohr, N. E. J.; Blümlein, J.; Britto, Ruth; Carrasco, John Joseph M.; Chicherin, Dmitry; Chiodaroli, Marco; Damgaard, Poul H.; Duca, Vittorio Del; Dixon, Lance J.; Dorigoni, Daniele; Duhr, Claude; Geyer, Yvonne; Green, Michael; Herrmann, Enrico; Heslop, Paul; Johansson, Henrik; Korchemsky, G.P.; Kosower, David A.; Mason, Lionel; Monteiro, Ricardo; O’Connell, Donal; Παπαθανασίου, Γεώργιος; Planté, Ludovic; Plefka, Jan; Puhm, Andrea; Raclariu, Ana-Maria; Roiban, Radu; Schneider, Carsten; Trnka, Jaroslav; Vanhove, Pierre; Wen, Congkao; White, Chris D.

doi:10.48550/arxiv.2203.13011

Cited by 12 publications

(28 citation statements)

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“…This work is an outgrowth and continuation of the study of chaos in scattering amplitudes [23][24][25]. More generally, the study of excited string scattering may connect with the large literature on modern scattering amplitudes in quantum field theory and string theory [26], such as scattering of higher spin particles [27,28].…”

Section: Jhep09(2022)211mentioning

confidence: 86%

Photon emission from an excited string

Firrotta

Rosenhaus

2022

J. High Energ. Phys.

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We compute the amplitude for an excited string in any precisely specified state to decay into another excited string in any precisely specified state, via emission of a tachyon or photon. For generic and highly excited string states, the amplitude is a complicated function of the outgoing kinematic angle, sensitive to the precise state. We compute the square of this amplitude, averaged over polarizations of the ingoing string and summed over polarizations of the outgoing string. The seeming intractability of these calculations is made possible by extracting amplitudes involving excited strings from amplitudes involving tachyons and a large number of photons; the number of photons grows with the complexity of the excited string state. Our work is in the spirit of the broad range of recent studies of statistical mechanics and chaos for quantum many-body systems. The number of different excited string states at a given mass is exponentially large, and our calculation gives the emission amplitude of a single photon from each of the microstates — which, through the Horowitz-Polchinski correspondence principle, are in correspondence with black hole microstates.

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Section: Jhep09(2022)211mentioning

confidence: 86%

Photon emission from an excited string

Firrotta

Rosenhaus

2022

J. High Energ. Phys.

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“…Similarly, the post-Minkowskian (PM) approximation is a weak-field expansion, but places no restriction on the magnitude of velocities. Next to entirely classical approaches to the PM approximation [17][18][19][20][21][22][23][24][25], recent progress is pioneered by methods starting out from (quantum) scattering amplitudes [26][27][28][29][30][31][32][33][34][35][36][37][38][39]. In addition, manifestly classical methods that make use of quantumfield-theory techniques show great promise for advancing the PM approximation, namely effective field theory [40][41][42][43][44][45] and worldline quantum field theory [46,47] approaches.…”

Section: Introductionmentioning

confidence: 99%

Energetics and scattering of gravitational two-body systems at fourth post-Minkowskian order

Khalil,

Buonanno,

Steinhoff

et al. 2022

Preprint

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Upcoming observational runs of the LIGO-Virgo-KAGRA collaboration, and future gravitationalwave (GW) detectors on the ground and in space, require waveform models more accurate than currently available. High-precision waveform models can be developed by improving the analytical description of compact binary dynamics and completing it with numerical-relativity (NR) information. Here, we assess the accuracy of the recent results for the fourth post-Minkowskian (PM) conservative dynamics through comparisons with NR simulations for the circular-orbit binding energy and for the scattering angle. We obtain that the 4PM dynamics gives better agreement with NR than the 3PM dynamics, and that while the 4PM approximation gives comparable results to the third post-Newtonian (PN) approximation for bound orbits, it performs better for scattering encounters. Furthermore, we incorporate the 4PM results in effective-one-body (EOB) Hamiltonians, which improves the disagreement with NR over the 4PM-expanded Hamiltonian from ∼ 40% to ∼ 10%, or ∼ 3% depending on the EOB gauge, for an equal-mass binary, two GW cycles before merger. Finally, we derive a 4PN-EOB Hamiltonian for hyperbolic orbits, and compare its predictions for the scattering angle to NR, and to the scattering angle of a 4PN-EOB Hamiltonian computed for elliptic orbits.

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“…Most of these developments involve so-called on-shell methods (see e.g. [1][2][3][4][5][6] for reviews on the always increasing number of techniques). On the other hand, off-shell methods are very scarce (see e.g.…”

Section: Introductionmentioning

confidence: 99%