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Leading-order gravitational radiation to all spin orders / Aoude, Rafael (Louvain U., CP3 ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Haddad, Kays (Uppsala U. ; Nordita) ; Heissenberg, Carlo (Queen Mary, U. of London, Math. Sci.) ; Helset, Andreas (Caltech, Pasadena (main) ; CERN)
Starting with on-shell amplitudes compatible with the scattering of Kerr black holes, we produce the gravitational waveform and memory effect including spin at their leading post-Minkowskian orders to all orders in the spins of both scattering objects. For the memory effect, we present results at next-to-leading order as well, finding a closed form for all spin orders when the spins are anti-aligned and equal in magnitude. [...]
arXiv:2310.05832.- 2024-02-01 - 15 p. - Published in : Phys. Rev. D 109 (2024) 036007 Fulltext: 2310.05832 - PDF; Publication - PDF;

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The gravitational eikonal: from particle, string and brane collisions to black-hole encounters / Di Vecchia, Paolo (Bohr Inst. ; Nordita ; Royal Inst. Tech., Stockholm) ; Heissenberg, Carlo (Nordita ; Royal Inst. Tech., Stockholm ; Uppsala U.) ; Russo, Rodolfo (Queen Mary, U. of London) ; Veneziano, Gabriele (CERN ; College de France)
Motivated by conceptual problems in quantum theories of gravity, the gravitational eikonal approach, inspired by its electromagnetic predecessor, has been successfully applied to the transplanckian energy collisions of elementary particles and strings since the late eighties, and to string-brane collisions in the past decade. After the direct detection of gravitational waves from black-hole mergers, most of the attention has shifted towards adapting these methods to the physics of black-hole encounters. [...]
arXiv:2306.16488; CERN-TH-2023-108; NORDITA 2023-026; QMUL-PH-23-09; UUITP-14/23.- 2024-07-01 - 215 p. - Published in : Phys. Rep. 1083 (2024) 1-169 Fulltext: 2306.16488 - PDF; Publication - PDF;

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Classical Gravitational Observables from the Eikonal Operator / Di Vecchia, Paolo (Bohr Inst. ; Nordita ; Stockholm U.) ; Heissenberg, Carlo (Nordita ; Stockholm U. ; Uppsala U.) ; Russo, Rodolfo (Queen Mary, U. of London (main)) ; Veneziano, Gabriele (CERN ; College de France)
We propose two possible eikonal operators encoding the effects of classical radiation as coherent states of gravitons and show how to compute from them different classical observables. In the first proposal, only genuinely propagating gravitons are included, while, in the second, zero-frequency modes are added in order to recover the effects of a static gravitational field. [...]
arXiv:2210.12118; CERN-TH-2022-169; NORDITA 2022-071; QMUL-PH-22-32; UUITP-42/22.- 2023-07-03 - 12 p. - Published in : Phys. Lett. B 843 (2023) 138049 Fulltext: Publication - PDF; 2210.12118 - PDF;

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The eikonal operator at arbitrary velocities I: the soft-radiation limit / Di Vecchia, Paolo (Bohr Inst. ; Nordita ; Stockholm U.) ; Heissenberg, Carlo (Nordita ; Stockholm U. ; Uppsala U.) ; Russo, Rodolfo (Queen Mary, U. of London) ; Veneziano, Gabriele (CERN ; College de France)
Observables related to the real part of the gravitational eikonal, such as the deflection angle and time delay, have been found so far to have a smooth post-Minkowskian (PM) expansion whose validity extends from the non-relativistic to the most extreme ultra-relativistic (UR) regime, which smoothly connects with massless particle collisions. To describe gravitational radiation, the eikonal phase has to be promoted to a unitary operator for which we motivate a proposal and start discussing properties in the soft-radiation limit. [...]
arXiv:2204.02378; CERN-TH-2022-058; NORDITA 2022-022; QMUL-PH-22-14; UUITP-20/22.- 2022-07-07 - 35 p. - Published in : JHEP 2207 (2022) 039 Fulltext: document - PDF; 2204.02378 - PDF;

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The eikonal approach to gravitational scattering and radiation at $ \mathcal{O} $(G$^{3}$) / Di Vecchia, Paolo (Bohr Inst. ; Nordita ; Royal Inst. Tech., Stockholm) ; Heissenberg, Carlo (Nordita ; Royal Inst. Tech., Stockholm ; Uppsala U.) ; Russo, Rodolfo (Queen Mary, U. of London) ; Veneziano, Gabriele (CERN ; College de France)
Using $\mathcal N=8$ supergravity as a theoretical laboratory, we extract the 3PM gravitational eikonal for two colliding massive scalars from the classical limit of the corresponding elastic two-loop amplitude. We employ the eikonal phase to obtain the physical deflection angle and to show how its non-relativistic (NR) and ultra-relativistic (UR) regimes are smoothly connected. [...]
arXiv:2104.03256; CERN-TH-2021-046; NORDITA 2021-028; QMUL-PH-21-17.- 2021-07-22 - 88 p. - Published in : JHEP 2107 (2021) 169 Fulltext: 2104.03256 - PDF; document - PDF;

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Radiation Reaction from Soft Theorems / Di Vecchia, Paolo (Bohr Inst. ; Nordita ; Royal Inst. Tech., Stockholm) ; Heissenberg, Carlo (Nordita ; Royal Inst. Tech., Stockholm ; Uppsala U.) ; Russo, Rodolfo (Queen Mary, U. of London) ; Veneziano, Gabriele (CERN ; College de France)
Radiation reaction (RR) terms at the third post-Minkowskian (3PM) order have recently been found to be instrumental in restoring smooth continuity between the non-relativistic, relativistic, and ultra-relativistic (including the massless) regimes. Here we propose a new and intriguing connection between RR and soft (bremsstrahlung) theorems which short-circuits the more involved conventional loop computations. [...]
arXiv:2101.05772; CERN-TH-2021-008; NORDITA 2021-001; QMUL-PH-21-03; UUITP-03/21.- 2021-07-10 - 17 p. - Published in : Phys. Lett. B 818 (2021) 136379 Article from SCOAP3: PDF; Fulltext: PDF;

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Universality of ultra-relativistic gravitational scattering / Di Vecchia, Paolo (Bohr Inst. ; Nordita ; Royal Inst. Tech., Stockholm) ; Heissenberg, Carlo (Nordita ; Royal Inst. Tech., Stockholm ; Uppsala U.) ; Russo, Rodolfo (Queen Mary, U. of London) ; Veneziano, Gabriele (CERN ; College de France)
We discuss the ultra-relativistic gravitational scattering of two massive particles at two-loop (3PM) level. We find that in this limit the real part of the eikonal, determining the deflection angle, is universal for gravitational theories in the two derivative approximation. [...]
arXiv:2008.12743; CERN-TH-2020-143; NORDITA 2020-079; QMUL-PH-20-25.- 2020-12-10 - 20 p. - Published in : Phys. Lett. B 811 (2020) 135924 Article from SCOAP3: PDF; Fulltext: PDF;

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