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.
References in corpus (7)
- Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
- Thermalization of Strongly Coupled Field Theories
- Holographic Evolution of Entanglement Entropy
- Linking Tests of Gravity On All Scales: from the Strong-Field Regime to Cosmology
- Weak Field Black Hole Formation in Asymptotically AdS Spacetimes
- Knotted solutions, from electromagnetism to fluid dynamics
- Geometrodynamics in a spherically symmetric, static crossflow of null dust