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The imperfect fluid behind kinetic gravity braiding
We present a standard hydrodynamical description for noncanonical 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. 133 
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: 
10298479 
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: 
OnlineRessource 
ID (e.g. DOI, URN): 
10.1007/JHEP11(2011)156 JHEP11(2011)156 
PPN (CatalogueID):  SPR047849487 
Internes Format
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245  1  0  a The imperfect fluid behind kinetic gravity braiding h Elektronische Ressource 
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520  a We present a standard hydrodynamical description for noncanonical 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 shiftcharge 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 energymomentum 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 nontrivial conditions for the thermodynamic equilibrium of this imperfect fluid.  
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