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Probing Dark Energy at Galactic and Cluster Scales
David F. Mota
We investigate dark matter halo properties as a function of a time--varying dark energy equation of state. The dynamics of the collapse of the halo is governed by the form of the q…
Microscopic and Macroscopic Behaviors of Palatini Modified Gravity Theories
Baojiu Li, David F. Mota, Douglas J. Shaw
We show that, within modified gravity, the non-linear nature of the field equations implies that the usual naive averaging procedure (replacing the microscopic energy-momentum by i…
Testing Alternative Theories of Dark Matter with the CMB
Baojiu Li, John D. Barrow, David F. Mota +1
We propose a method to study and constrain modified gravity theories for dark matter using CMB temperature anisotropies and polarization. We assume that the theories considered her…
Beyond the Chameleon Mechanism
David F. Mota, Douglas J. Shaw
As a result of non-linear self-interactions, in chameleon theories where the field couples to matter much more strongly than gravity does, the fifth force between two bodies with t…
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…
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…