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Cosmological k-essence condensation
Neven Bilic, Gary B. Tupper, Raoul D. Viollier
We consider a model of dark energy/matter unification based on a k-essence type of theory similar to tachyon condensate models. Using an extension of the general relativistic spher…
Cosmological tachyon condensation
Neven Bilic, Gary B. Tupper, Raoul D. Viollier
We consider the prospects for dark matter/energy unification in k-essence type theories. General mappings are established between the k-essence scalar field, the hydrodynamic and b…
Ghost Condensate Busting
Neven Bilić, Gary B. Tupper, Raoul D. Viollier
Applying the Thomas-Fermi approximation to renormalizable field theories, we construct ghost condensation models that are free of the instabilities associated with violations of th…
Chaplygin Gas Cosmology - Unification of Dark Matter and Dark Energy
Neven Bilic, Gary B. Tupper, Raoul D. Viollier
The models that unify dark matter and dark energy based upon the Chaplygin gas fail owing to the suppression of structure formation by the adiabatic speed of sound. Including strin…