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Statut |
Confirmé |
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Série |
IJCLAB-COSM |
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Domaines |
gr-qc |
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Date |
Mercredi 25 Septembre 2024 |
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Heure |
14:00 |
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Institut |
IJCLAB |
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Salle |
210/1-114 - Salle des Séminaires |
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Nom de l'orateur |
Herfray |
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Prenom de l'orateur |
Yannick |
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Addresse email de l'orateur |
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Institution de l'orateur |
Université de Tours |
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Titre |
Extended boundary at spatial- and time-infinity |
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Résumé |
Penrose conformal compactification allows for an elegant description of asymptotically flat spacetime
where a boundary is added at null infinity. In particular the scattering data of massless fields naturally live
on this boundary and this realises a representation of the BMS asymptotic symmetry group. I will review
this and how this relates to recent developments in scattering amplitudes of massless fields.
A geometric description of spatial infinity is notoriously more elusive, I will however show that methods of
projective geometry allows for a picture very similar to that of null infinity. A key idea here is the
introduction of an extended, four dimensional, boundary. In particular scattering data of massive fields are
naturally realised on this extended boundary and carry a representation of the BMS group. Finally strong
evidence suggests that ``Strominger's matching conditions'' have a most natural realisation in this
framework. |
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Numéro de preprint arXiv |
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Commentaires |
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Fichiers attachés |
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