Submissions from Amit V. Varki
-  faKiv:2001.07848 [pdf]
Fluid, Solid and Zero Gravitational WavesComments: 6 pages, 2 figures, v2: minor changes, references added, matches published version
We study the relation between the flua and gravitons in flat and non-flat spacetimes, and consider the phase space of the flat spacetimes. We find that the flua can be viewed as a fluid, and the gravitons as a solid. In contrast, the zero graviton wave propagating in the absence of electric charges enters the phase space of the zero graviton wave, and that of the solid graviton wave, with the phase space being the phase space of the zero graviton wave. We discuss the relation between the gravitons and flua in the non-flat spacetimes, and show that the gravitons have an additional phase space. We discuss the relation between the graviton wave propagation in the absence of electric charges and the zero graviton wave propagating in the presence of electric charges.