Archimedean-type force in a cosmic dark fluid: II. Qualitative and numerical study of a multistage Universe expansion

Understand

In this (second) part of the work we present the results of numerical and qualitative analysis, based on a new model of the Archimedean-type interaction between dark matter and dark energy.

• The Archimedean-type force is linear in the four-gradient of the dark energy pressure and plays a role of self-regulator of the energy redistribution in a cosmic dark fluid.
• Because of the Archimedean-type interaction the cosmological evolution is shown to have a multistage character.
• Depending on the choice of the values of the model guiding parameters,the Universe's expansion is shown to be perpetually accelerated, periodic or quasiperiodic with finite number of deceleration/acceleration epochs.