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Disformal quintessence
Tomi S. Koivisto
A canonic scalar field minimally coupled to a disformal metric generated by the field itself is considered. Causality and stability conditions are derived for such a field. Cosmolo…
Newtonian limit of nonlocal cosmology
Tomi S. Koivisto
We study the consequences of the gravity models for the Solar system and the large scale structure of the universe. The spherically symmetric solutions can be used to o…
Vector Field Models of Inflation and Dark Energy
Tomi S. Koivisto, David F. Mota
We consider several new classes of viable vector field alternatives to the inflaton and quintessence scalar fields. Spatial vector fields are shown to be compatible with the cosmol…
Dynamics of Nonlocal Cosmology
Tomi Koivisto
Nonlocal quantum corrections to gravity have been recently proposed as a possible solution to the cosmological fine tuning problems. We study the dynamics of a class of nonlocal ac…
Anisotropic Dark Energy: Dynamics of Background and Perturbations
Tomi Koivisto, David F. Mota
We investigate cosmologies where the accelerated expansion of the Universe is driven by a field with an anisotropic equation of state. We model such scenarios within the Bianchi I…