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1.
Classical Observables from the Exponential Representation of the Gravitational S-Matrix / Damgaard, Poul H. (Bohr Inst. ; CERN) ; Hansen, Elias Roos (Bohr Inst.) ; Planté, Ludovic (Bohr Inst.) ; Vanhove, Pierre (IPhT, Saclay)
By combining the KMOC-formalism with the exponential representation of the scattering matrix we show that the two-body scattering angle is given by the corresponding matrix element of the exponential representation. This holds to all orders in the Post-Minkowskian expansion of gravity when restricted to the conservative sector. [...]
arXiv:2307.04746; CERN-TH-2023-135; IPhT-T23/041; LAPTh-029/23.- 2023-09-26 - 37 p. - Published in : JHEP 2309 (2023) 183 Fulltext: 2307.04746 - PDF; document - PDF;
2.
The Relation Between KMOC and Worldline Formalisms for Classical Gravity / Damgaard, Poul H. (Bohr Inst. ; CERN) ; Hansen, Elias Roos (Bohr Inst.) ; Planté, Ludovic (Bohr Inst.) ; Vanhove, Pierre (IPhT, Saclay)
We demonstrate the equivalence between KMOC and worldline formalisms for classical general relativity, highlighting how the Keldysh-Schwinger in-in formalism is contained in both of them even though the KMOC representation conventionally leads to the evaluation of scattering amplitudes with Feynman propagators. The relationship between the two approaches is illustrated in detail for the momentum kick at second Post-Minkowskian order..
arXiv:2306.11454; CERN-TH-2023-096; IPhT-t23/040; LAPTH-023/23.- 2023-09-11 - 39 p. - Published in : JHEP 2309 (2023) 059 Fulltext: 2306.11454 - PDF; document - PDF;

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