Emmy's letter to Santa Claus (and a reply): Vaidya geometries and scalar fields with null gradients
Valerio Faraoni,
Andrea Giusti,
Bardia H. Fahim
Abstract:Emmy, a child prodigy, writes a letter to Santa Claus asking for a Vaidya solution sourced by a massless scalar field with null gradient for Christmas. Santa writes back explaining why such a toy cannot be built and offers an exact plane wave sourced by a scalar field with lightlike gradient as a replacement.
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