One of the most pressing, modern cosmological mysteries is the cause of the accelerated expansion of the universe. The energy density required to cause this large scale opposition to gravity is known to be both far in excess of the known matter content, and remarkably smooth and unclustered across the universe. While the most commonly accepted answer is that a cosmological constant is responsib...

Recent large-scale peculiar velocity surveys suggest that large matter volumes could be moving with appreciable velocity with respect to the CMB rest frame. If confirmed, such results could conflict with the Cosmological Principle according to which the matter and CMB rest frames should converge on very large scales. In this work we explore the possibility that such large scale bulk flows are d...

The Dark Energy Survey is proposing to constrain dark energy with four complementary probes: galaxy cluster counts, weak lensing, galaxy clustering and Type Ia Supernovae. In order to achieve this a new 3 deg CCD camera will be mounted on the Blanco 4-m telescope at the Cerro Tololo Inter-American Observatory (CTIO). The camera will be sensitive up to 24 magnitude in the g,r,i and z bands. The ...

A model of compact object coupled to inhomogeneous anisotropic dark energy is studied. It is assumed a variable dark energy that suffers a phase transition at a critical density. The anisotropic Λ−Tolman-Oppenheimer-Volkoff equations are integrated to know the structure of these objects. The anisotropy is concentrated on a thin shell where the phase transition takes place, while the rest of the...