Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2011-03-28
JHEP 1111:156,2011
Physics
High Energy Physics
High Energy Physics - Theory
23 pages plus appendices. New version includes extended discussion on diffusion and dynamics in alternative frames, as well as
Scientific paper
10.1007/JHEP11(2011)156
We present a standard hydrodynamical description for non-canonical scalar field theories with kinetic gravity braiding. In particular, this picture applies to the simplest galileons and k-essence. The fluid variables not only have a clear physical meaning but also drastically simplify the analysis of the system. The fluid carries charges corresponding to shifts in field space. This shift-charge current contains a spatial part responsible for diffusion of the charges. Moreover, in the incompressible limit, the equation of motion becomes the standard diffusion equation. The fluid is indeed imperfect because the energy flows neither along the field gradient nor along the shift current. The fluid has zero vorticity and is not dissipative: there is no entropy production, the energy-momentum is exactly conserved, the temperature vanishes and there is no shear viscosity. Still, in an expansion around a perfect fluid one can identify terms which correct the pressure in the manner of bulk viscosity. We close by formulating the non-trivial conditions for the thermodynamic equilibrium of this imperfect fluid.
Pujolas Oriol
Sawicki Ignacy
Vikman Alexander
No associations
LandOfFree
The Imperfect Fluid behind Kinetic Gravity Braiding does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Imperfect Fluid behind Kinetic Gravity Braiding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Imperfect Fluid behind Kinetic Gravity Braiding will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-707541