Institution(s): 1. University of Nairobi
The currently most successful model of our universe that agrees well with a wide range of observations is the “standard” Lambda Cold Dark Matter model which predicts that the universe is dominated by two major components: dark matter and dark energy- making up over 96% of the cosmic energy budget. The two are usually assumed to couple only via their gravitational effects. However, there could be a non-gravitation coupling between the two, giving rise to possible changes in the dark-sectors equations of state and structure formation. Such an interaction is permitted in field theory and if true would help explain the reason why the dark matter and dark energy densities are of the same order today. In this talk, we will explore some possible interesting cosmological scenarios when such an interaction is considered and highlight interesting resulting implications on our current knowledge on structure formation, using Planck results as an example.