| dc.description.abstract | The physics of the dark energy and the dark matter is still an open issue in cosmology. The dark energy occupies
about 68.5% of the total energy density of the universe today [1], and is believed to accelerate its observed expansion,
but the physical nature, origin, and time evolution of this dark energy remain unknown. On the other hand, the
dark matter sector (occupying almost 27.5% of the total energy density of the present-day universe) appears to be
the principal gravitational in
uence on the formation of large-scale structure in the universe and its existence is
supported by direct evidence from the spiral galaxy rotation curves and cluster dynamics [2]. At present, we have
a many dark-energy models [3, 4] and, according to syntheses of all the current observational data, -cosmology
appears to be the simplest cosmological model that can explain the bulk of the evidence. However, the unexplained
numerical value of the cosmological constant, and the coincidences between the present densities of the di erent dark
and luminous components of the universe, provoke us to search for new cosmological scenarios in which the observed
state of a airs is more natural. In this work we will explore cosmologies where dark energy interacts and exchanges
energy with dark matter. | |
