Vaidya geometries and scalar fields with null gradients.
Journal
The European physical journal. C, Particles and fields
ISSN: 1434-6044
Titre abrégé: Eur Phys J C Part Fields
Pays: France
ID NLM: 101622319
Informations de publication
Date de publication:
2021
2021
Historique:
received:
25
11
2020
accepted:
08
03
2021
entrez:
8
4
2021
pubmed:
9
4
2021
medline:
9
4
2021
Statut:
ppublish
Résumé
Since, in Einstein gravity, a massless scalar field with lightlike gradient behaves as a null dust, one could expect that it can act as the matter source of Vaidya geometries. We show that this is impossible because the Klein-Gordon equation forces the null geodesic congruence tangent to the scalar field gradient to have zero expansion, contradicting a basic property of Vaidya solutions. By contrast, exact plane waves travelling at light speed and sourced by a scalar field acting as a null dust are possible.
Identifiants
pubmed: 33828412
doi: 10.1140/epjc/s10052-021-09040-9
pii: 9040
pmc: PMC7976656
doi:
Types de publication
Journal Article
Langues
eng
Pagination
232Informations de copyright
© The Author(s) 2021.
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