A note on the equivalence of a barotropic perfect fluid with a K-essence scalar field
arXiv:1002.1376 · doi:10.1103/PhysRevD.81.107301
Abstract
In this short note, we obtain the necessary and sufficient condition for a class of non-canonical single scalar field models to be exactly equivalent to barotropic perfect fluids, under the assumption of an irrotational fluid flow. An immediate consequence of this result is that the non-adiabatic pressure perturbation in this class of scalar field systems vanishes exactly at all orders in perturbation theory and on all scales. The Lagrangian for this general class of scalar field models depends on both the kinetic term and the value of the field. However, after a field redefinition, it can be effectively cast in the form of a purely kinetic K-essence model.
4 pages, 1 figure; v2: References and footnotes 3 and 4 added. Replaced to match published version
References in corpus (13)
- Dynamics of dark energy
- Observational Signatures and Non-Gaussianities of General Single Field Inflation
- Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
- Perturbations in generalized multi-field inflation
- The Inflationary Trispectrum for Models with Large Non-Gaussianities
- Primordial fluctuations and non-Gaussianities in multi-field DBI inflation
- Non-gaussianity from the trispectrum in general single field inflation
- On the full quantum trispectrum in multi-field DBI inflation
- Action approach to cosmological perturbations: the 2nd order metric in matter dominance
- Lorentz boost and non-Gaussianity in multi-field DBI-inflation
- Affine equation of state from quintessence and k-essence fields
- Nonlinear perturbations of cosmological scalar fields with non-standard kinetic terms
- CMB temperature anisotropies from third order gravitational perturbations
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- Scalar field as a perfect fluid: thermodynamics of minimally coupled scalars and Einstein frame scalar-tensor gravity
- Quantum fractionary cosmology: K-essence theory
- Lagrangian description of cosmic fluids: mapping dark energy into unified dark energy
- Dynamic Field Theory and Equations of Motion in Cosmology
- Dissipative quintessence, and its cosmological implications
- Non-Stationary Dark Energy Around a Black Hole
- Inflation with exotic kinetic terms in Einstein-Chern-Simons gravity
- Cosmological Perturbations: Vorticity, Isocurvature and Magnetic Fields
- Effective field theory of coupled dark energy and dark matter