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 $$\mu $$ . 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 $$\mu = 0.843^{+0.014}_{-0.015}\,$$ ($$0.822^{+0.022}_{-0.024}$$ ) for a flat (curved) universe. Furthermore, with these constraints we also estimate the deceleration parameter today $$q_0=-0.67 \pm 0.02\,(-0.51\pm 0.07)$$ , the acceleration-deceleration transition redshift $$z_t=0.57\pm 0.04\, (0.50 \pm 0.06)$$ , and the universe age $$t_A = 13.108^{+0.270}_{-0.260}\,\times (12.314^{+0.590}_{-0.430})\,$$ Gyrs. We also report a best value of $$\varOmega _k = 0.183^{+0.073}_{-0.079}$$ consistent at $$3\sigma $$ 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.
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"value": "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 $$\\mu $$ <math><mi>\u03bc</mi></math> . 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 $$\\mu = 0.843^{+0.014}_{-0.015}\\,$$ <math><mrow><mi>\u03bc</mi><mo>=</mo><mn>0</mn><mo>.</mo><msubsup><mn>843</mn><mrow><mo>-</mo><mn>0.015</mn></mrow><mrow><mo>+</mo><mn>0.014</mn></mrow></msubsup><mspace width=\"0.166667em\"></mspace></mrow></math> ($$0.822^{+0.022}_{-0.024}$$ <math><mrow><mn>0</mn><mo>.</mo><msubsup><mn>822</mn><mrow><mo>-</mo><mn>0.024</mn></mrow><mrow><mo>+</mo><mn>0.022</mn></mrow></msubsup></mrow></math> ) for a flat (curved) universe. Furthermore, with these constraints we also estimate the deceleration parameter today $$q_0=-0.67 \\pm 0.02\\,(-0.51\\pm 0.07)$$ <math><mrow><msub><mi>q</mi><mn>0</mn></msub><mo>=</mo><mo>-</mo><mn>0.67</mn><mo>\u00b1</mo><mn>0.02</mn><mspace width=\"0.166667em\"></mspace><mrow><mo>(</mo><mo>-</mo><mn>0.51</mn><mo>\u00b1</mo><mn>0.07</mn><mo>)</mo></mrow></mrow></math> , the acceleration-deceleration transition redshift $$z_t=0.57\\pm 0.04\\, (0.50 \\pm 0.06)$$ <math><mrow><msub><mi>z</mi><mi>t</mi></msub><mo>=</mo><mn>0.57</mn><mo>\u00b1</mo><mn>0.04</mn><mspace width=\"0.166667em\"></mspace><mrow><mo>(</mo><mn>0.50</mn><mo>\u00b1</mo><mn>0.06</mn><mo>)</mo></mrow></mrow></math> , and the universe age $$t_A = 13.108^{+0.270}_{-0.260}\\,\\times (12.314^{+0.590}_{-0.430})\\,$$ <math><mrow><msub><mi>t</mi><mi>A</mi></msub><mo>=</mo><mn>13</mn><mo>.</mo><msubsup><mn>108</mn><mrow><mo>-</mo><mn>0.260</mn></mrow><mrow><mo>+</mo><mn>0.270</mn></mrow></msubsup><mspace width=\"0.166667em\"></mspace><mo>\u00d7</mo><mrow><mo>(</mo><mn>12</mn><mo>.</mo><msubsup><mn>314</mn><mrow><mo>-</mo><mn>0.430</mn></mrow><mrow><mo>+</mo><mn>0.590</mn></mrow></msubsup><mo>)</mo></mrow><mspace width=\"0.166667em\"></mspace></mrow></math> Gyrs. We also report a best value of $$\\varOmega _k = 0.183^{+0.073}_{-0.079}$$ <math><mrow><msub><mi>\u03a9</mi><mi>k</mi></msub><mo>=</mo><mn>0</mn><mo>.</mo><msubsup><mn>183</mn><mrow><mo>-</mo><mn>0.079</mn></mrow><mrow><mo>+</mo><mn>0.073</mn></mrow></msubsup></mrow></math> consistent at $$3\\sigma $$ <math><mrow><mn>3</mn><mi>\u03c3</mi></mrow></math> 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."
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