Cosmological constraints on alternative model to Chaplygin fluid revisited
Abstract In this work we explore an alternative phenomenological model to Chaplygin gas proposed by Hova et al. (Int J Mod Phys D 26:1750178, 2017), consisting on a modification of a perfect fluid, to explain the dynamics of dark matter and dark energy at cosmological scales immerse in a flat or cur...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2019-01-01
|
| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-018-6521-6 |
| Summary: | Abstract In this work we explore an alternative phenomenological model to Chaplygin gas proposed by Hova et al. (Int J Mod Phys D 26:1750178, 2017), consisting on a modification of a perfect fluid, to explain the dynamics of dark matter and dark energy at cosmological scales immerse in a flat or curved universe. Adopting properties similar to a Chaplygin gas, the proposed model is a mixture of dark matter and dark energy components parameterized by only one free parameter denoted as $$\mu $$ μ . We focus on contrasting this model with the most recent cosmological observations of Type Ia supernovae and Hubble parameter measurements. Our joint analysis yields a value $$\mu = 0.843^{+0.014}_{-0.015}\,$$ μ=0.843-0.015+0.014 ($$0.822^{+0.022}_{-0.024}$$ 0.822-0.024+0.022 ) for a flat (curved) universe. Furthermore, with these constraints we also estimate the deceleration parameter today $$q_0=-0.67 \pm 0.02\,(-0.51\pm 0.07)$$ q0=-0.67±0.02(-0.51±0.07) , the acceleration-deceleration transition redshift $$z_t=0.57\pm 0.04\, (0.50 \pm 0.06)$$ zt=0.57±0.04(0.50±0.06) , and the universe age $$t_A = 13.108^{+0.270}_{-0.260}\,\times (12.314^{+0.590}_{-0.430})\,$$ tA=13.108-0.260+0.270×(12.314-0.430+0.590) Gyrs. We also report a best value of $$\varOmega _k = 0.183^{+0.073}_{-0.079}$$ Ωk=0.183-0.079+0.073 consistent at $$3\sigma $$ 3σ with the one reported by Planck Collaboration. Our analysis confirm the results by Hova et al. this Chaplygin gas-like is a plausible alternative to explain the nature of the dark sector of the universe. |
|---|---|
| ISSN: | 1434-6044 1434-6052 |