Cosmology with hybrid expansion law: scalar field reconstruction of cosmic history and observational constraints

Understand

In this paper, we consider a simple form of expansion history of Universe referred to as the hybrid expansion law - a product of power-law and exponential type of functions.

• The ansatz by construction mimics the power-law and de Sitter cosmologies as special cases but also provides an elegant description of the transition from deceleration to cosmic acceleration.
• We point out the Brans-Dicke realization of the cosmic history under consideration.
• We construct potentials for quintessence, phantom and tachyon fields, which can give rise to the hybrid expansion law in general relativity.