Hybrid expansion law for accelerating universe in FRW Cosmology

Authors

Bhakta Kunwar, Nar Bahadur Bhandari Government College, Tadong, Gangtok, Sikkim, IndiaFollow

Abstract

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)~t^B, an exponential law a(t)~t^At 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.

Recommended Citation

Kunwar, Bhakta (2020) "Hybrid expansion law for accelerating universe in FRW Cosmology," Manipal Journal of Science and Technology: Vol. 5: Iss. 1, Article 3.
Available at: https://impressions.manipal.edu/mjst/vol5/iss1/3