The eikonal operator at arbitrary velocities I: the soft-radiation limit
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- Vecchia2022_Article_TheEikonalOperatorAtArbitraryV
Final published version, 565 KB, PDF document
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. A convergent PM expansion is found to only hold below an UR bound (discussed in the GR literature in the seventies) above which a different expansion is instead needed implying, in general, some non-analyticity in Newton's constant. In this extreme UR regime soft radiative observables receive contributions only from gravitons and are therefore universal. This generalises the pattern discussed in [1] beyond the elastic case.
Original language | English |
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Article number | 039 |
Journal | Journal of High Energy Physics |
Volume | 2022 |
Issue number | 7 |
Number of pages | 31 |
ISSN | 1029-8479 |
DOIs | |
Publication status | Published - 7 Jul 2022 |
- Black Holes, Classical Theories of Gravity, Scattering Amplitudes, Supergravity Models, GRAVITATIONAL-WAVES, BREMSSTRAHLUNG, GENERATION, DERIVATION, ENCOUNTERS, PHOTONS
Research areas
ID: 315265253