Scalar field as a null dust
arXiv:1812.06457 · doi:10.1140/epjc/s10052-019-6829-x
Abstract
We show that a canonical, minimally coupled scalar field which is non-self interacting and massless is equivalent to a null dust fluid (whether it is a test or a gravitating field), in a spacetime region in which its gradient is null. Under similar conditions, the gravitating and nonminimally coupled Brans-Dicke-like scalar of scalar-tensor gravity, instead, cannot be represented as a null dust unless its gradient is also a Killing vector field.
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- More on the Classical Double Copy in Three Spacetime Dimensions
- Equivalence between Horndeski and beyond Horndeski theories and imperfect fluids
- Existence and absence of Killing horizons in static solutions with symmetries
- Minimally coupled scalar fields as imperfect fluids
- Exact Kerr--Schild spacetimes from linearized kinetic gravity braiding