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The Simplest Parametrization of the Equation of State Parameter in the Scalar Field Universe
In this paper, we investigate a scalar field cosmological model of accelerating Universe with the simplest parametrization of the equation of state parameter of the scalar field. We use H(z) data, pantheon compilation of SN Ia data and BAO data to constrain the model parameters using the χ2 minimization technique. We obtain the present values of Hubble constant H0 as 66.2−1.34+1.42, 70.7−0.31+0.32 and 67.74−1.04+1.24 for H(z), H(z) + Pantheon and H(z) + BAO respectively. In addition, we estimate the present age of the Universe in a derived model t0=14.38−0.64+0.63 for joint H(z) and pantheon compilation of SN Ia data which has only 0.88σ tension with its empirical value obtained in Plank collaboration. Moreover, the present values of the deceleration parameter q0 come out to be −0.55−0.038+0.031, −0.61−0.021+0.030 and −0.627−0.025+0.022 by bounding the Universe in the derived model with H(z), H(z) + Pantheon compilation of SN Ia and H(z) + BAO data sets, respectively. We also have performed the state-finder diagnostics to discover the nature of dark energy.
Journal Article
New type of dark energy could solve Universe expansion mystery
Hints of a previously unknown, primordial form of the substance could explain why the cosmos now seems to be expanding faster than theory predicts.
Journal Article
Cosmology and the evolution of the universe
Covers the current scientific understanding of the creation and evolution of the universe.
Book
New type of dark energy could solve Universe expansion mystery
Hints of a previously unknown, primordial form of the substance could explain why the cosmos now seems to be expanding faster than theory predicts.
Journal Article
New type of dark energy could solve Universe expansion mystery
Hints of a previously unknown, primordial form of the substance could explain why the cosmos now seems to be expanding faster than theory predicts.
Journal Article
Cosmic inflation explained
\"Cosmic inflation is the theory that the early universe went through fast, exponential expansion for a fraction of a second after the Big Bang and then slowed down to the current rate of expansion. Simplified explanations of complex scientific concepts such as dark energy, dark matter, and the cosmic microwave background and dynamic images will help students comprehend how the study of cosmic inflation has reshaped our understanding of how the universe was born, evolved, and might be in the future. This title correlates with the Next Generation Science Standards' emphasis on scientific collection and analysis of data and evidence-based theories. Informative sidebars explore related timely topics in depth, while a Further Reading section provides several resources for additional study.\"-- Provided by publisher.
BOOK
How fast is the Universe expanding? Cosmologists just got more confused
Hotly anticipated technique fails to resolve disagreement over speed of cosmic expansion -- for now.
Journal Article