Dark energy and dark matter unification from dynamical space time: observational constraints and cosmological implications

Understand

A recently proposed Dynamical Space-time Cosmology (DSC) that unifies dark energy and dark matter is studied.

• The general action of this scenario includes a Lagrange multiplier, which is coupled to the energy momentum tensor and a scalar field which is different from quintessence.
• First for various types of potentials we implement a critical point analysis and we find solutions which lead to cosmic acceleration and under certain conditions to stable late-time attractors.
• Then the DSC cosmology is confronted with the latest cosmological data from low-redshift probes, namely measurements of the Hubble parameter and standard candles (Pantheon SnIa, Quasi-stellar objects).