The eikonal operator at arbitrary velocities I: the soft-radiation limit
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › fagfællebedømt
Dokumenter
- Vecchia2022_Article_TheEikonalOperatorAtArbitraryV
Forlagets udgivne version, 565 KB, PDF-dokument
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.
Originalsprog | Engelsk |
---|---|
Artikelnummer | 039 |
Tidsskrift | Journal of High Energy Physics |
Vol/bind | 2022 |
Udgave nummer | 7 |
Antal sider | 31 |
ISSN | 1029-8479 |
DOI | |
Status | Udgivet - 7 jul. 2022 |
ID: 315265253