Regular Article – Theoretical Physics
Gravitational Landau damping for massive scalar modes
Physics Department, “Sapienza” University of Rome, P.le Aldo Moro 5, 00185, Rome, Italy
2 Departament de Física Teòrica and IFIC, Centro Mixto Universitat de València-CSIC, Universitat de València, 46100, Burjassot, Valencia, Spain
3 ENEA, Fusion and Nuclear Safety Department, C. R. Frascati, Via E. Fermi 45, 00044, Frascati, Roma, Italy
Accepted: 11 December 2020
Published online: 28 December 2020
We establish the possibility of Landau damping for gravitational scalar waves which propagate in a non-collisional gas of particles. In particular, under the hypothesis of homogeneity and isotropy, we describe the medium at the equilibrium with a Jüttner–Maxwell distribution, and we analytically determine the damping rate from the Vlasov equation. We find that damping occurs only if the phase velocity of the wave is subluminal throughout the propagation within the medium. Finally, we investigate relativistic media in cosmological settings by adopting numerical techniques.
© The Author(s) 2020
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