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Vaidya geometries and scalar fields with null gradients

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...

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Publicat a:Eur Phys J C Part Fields
Autors principals: Faraoni, Valerio, Giusti, Andrea, Fahim, Bardia H.
Format: Artigo
Idioma:Inglês
Publicat: Springer Berlin Heidelberg 2021
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Accés en línia:https://ncbi.nlm.nih.gov/pmc/articles/PMC7976656/
https://ncbi.nlm.nih.gov/pubmed/33828412
https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1140/epjc/s10052-021-09040-9
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