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The imperfect fluid behind kinetic gravity braiding

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... Full description

Main Author: Pujolàs, Oriol
Contributors: Sawicki, Ignacy
Vikman, Alexander
Contained in: Journal of High Energy Physics Berlin : Springer Vol. 2011, No. 11 (2011), p. 1-33
Journal Title: Journal of High Energy Physics
Fulltext access: Fulltext access (direct link - free access) 10.1007/JHEP11(2011)156
Availability is being checked...
Links: Volltext (dx.doi.org)
ISSN: 1029-8479
Keywords: Classical Theories of Gravity
Cosmology of Theories beyond the SM
Global Symmetries
Nonperturbative Effects
OriginalPaper
DOI: 10.1007/JHEP11(2011)156
Language: English
Notes: Open Access
A r X iv e P rint:1103.5360
Physical Description: Online-Ressource
ID (e.g. DOI, URN): 10.1007/JHEP11(2011)156
JHEP11(2011)156
PPN (Catalogue-ID): SPR047849487
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520 |a 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. 
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