New geometries for the characterization of dark matter phenomena

O. M. MORESCHI; EZEQUIEL BOERO; EMANUEL GALLO

Buenos Aires

Congreso; Graco-II; 2014

The standard characterization of dark matter phenomena is through models thatassume the generally accepted cold dark matter model.However, when studying dark matter phenomena with different techniques oneoften finds non-trivial disagreement among the measurements.Notably, when estimating the matter content in a region using gravitational weak lensing effects and dynamical studies, the different techniques do not coincidein the estimated value.These problems might be related to the way one normally deals with inhomogeneities in cosmology.We will comment briefly on the inherent problems involved in the notion of averaging of tensors; that contribute to unexpected terms in the energy momentum tensor.In a previous study of weak lensing we have noticed that a spacelike contributionof the energy-momentum tensor has been neglected in previous works.We present some new geometries that involve new kind of energy momentum tensorswhich are suitable for the description of dark matter phenomena.