Manipal Journal of Science and Technology


We propose a cosmological model in the form of a hybrid expansion law wherein the scale factor is given by the product of three terms. These terms include a power-law a(t)~tB, an exponential law a(t)~tAt and a damping term a(t)~t-c/t. Equivalently the proposed hybrid law takes the form H(t) = A + B/t + C/t2, where H(t) is Hubble parameter in terms of cosmic time t. We confirmed that the model is in agreement with the observational data of Hubble parameter H(z) and the distance modulus μ versus red-shift z data of SNIa Union 2.1. The model also shows the transition from deceleration to acceleration phase at red-shift lying between 0.652 and 0.839.