Observational constraints on modified Chaplygin gas in Horava–Lifshitz gravity with dark radiation

Paul, Bikash Chandra; Thakur, P.; Verma, Murli Manohar

doi:10.1007/s12043-013-0593-5

Cited by 11 publications

(6 citation statements)

References 69 publications

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“…In HL cosmology, the EoS parameter of modified Chaplygin gas has been explored by various observational constraints. [ 84 ] The cosmological scenario of the parametrizations of EoS in Chern–Simons modified gravity has been explored by ref. [85].…”

Section: Introductionmentioning

confidence: 99%

Exploring Late‐Time Cosmic Acceleration with Eos Parameterizations in Horava‐Lifshitz Gravity via Baryon Acoustic Oscillations

Khurana,

Chaudhary,

Debnath

et al. 2024

Fortschritte der Physik

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In this study, the framework of Horava‐Lifshitz gravity to model the Universe's dark matter and dark energy (DE) components is adopted. Specifically, two recent parametrizations for DE models: the CBDRM‐type and CADMM‐type parameterizations is considered. In the analysis, the Hubble parameter is explicitly expressed, denoted as , for these two distinct dark energy models. By doing so, investigate and quantify the accelerated cosmic expansion rate characterizing the late‐time Universe is aimed. This study uses a wide range of datasets. This dataset consists of recent measurements of baryon acoustic oscillations (BAOs) collected over a period of 22 years with the Cosmic Chronometers (CC) dataset, Type Ia supernovae (SNIa) dataset, the Hubble diagram of gamma‐ray bursts (GRBs), quasars (Q), and the latest measurement of the Hubble constant (R22). Consequently, a crucial aspect of this study by plotting the vs. H0 plane is presented. In the context of the ΛCDM model, after incorporating all the datasets, including the R22 prior, the following results: H0 = 71.674089 ± 0.734089 and is obtained. For the CBDRM model, H0 = 72.355058 ± 1.004604 and is found. In the case of the CADMM model, the analysis yields H0 = 72.347804 ± 0.923328 and . Cosmographic analyses for both of the proposed parameterizations in comparison to the ΛCDM paradigm are conducted. Additionally, Diagnostic tests to investigate the evolution of both models is applied. Finally, the Information Criteria test demonstrates that the ΛCDM model emerges as the preferred choice among the models is considered.

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Section: Introductionmentioning

confidence: 99%

Exploring Late‐Time Cosmic Acceleration with Eos Parameterizations in Horava‐Lifshitz Gravity via Baryon Acoustic Oscillations

Khurana,

Chaudhary,

Debnath

et al. 2024

Fortschritte der Physik

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“…Also, the MCG parameters have been constrained by CMBR, WMAP data [56,57]. On the other hand, the MCG parameters have been constrained in modified gravity theories [58][59][60][61][62][63].…”

Section: Introductionmentioning

confidence: 99%

Roles of Modified Chaplygin-Jacobi and Chaplygin-Abel Gases in FRW Universe

Debnath

2021

Preprint

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We have considered flat Friedmann-Robertson-Walker (FRW) model of the universe and reviewed the modified Chaplygin gas as the fluid source. Associated with the scalar field model, we have determined the Hubble parameter as a generating function in terms of the scalar field. Instead of hyperbolic function, we have taken Jacobi elliptic function and Abel function in the generating function and obtained modified Chaplygin-Jacobi gas (MCJG) and modified Chaplygin-Abel gas (MCAG) equation of states, respectively. Next, we have assumed that the universe filled in dark matter, radiation, and dark energy. The sources of dark energy candidates are assumed as MCJG and MCAG. We have constrained the model parameters by recent observational data analysis. Using χ 2 minimum test (maximum likelihood estimation), we have determined the best fit values of the model parameters by OHD+CMB+BAO+SNIa joint data analysis. To examine the viability of the MCJG and MCAG models, we have determined the values of the deviations of information criteria like △AIC, △BIC and △DIC. The evolutions of cosmological and cosmographical parameters (like equation of state, deceleration, jerk, snap, lerk, statefinder, Om diagnostic) have been studied for our best fit values of model parameters. To check the classical stability of the models, we have examined the values of square speed of sound v 2 s in the interval (0, 1) for expansion of the universe.

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“…Also, MCG in HL gravity and observational constraints has been studied by the Refs. [76,77] with possibility of extension to the case of varying G and Λ [78]. Now, we would like to investigate ECG in HL gravity.…”

Section: Contents 1 Introductionmentioning

confidence: 99%

Extended Chaplygin gas in Horava–Lifshitz gravity

Pourhassan

2016

Physics of the Dark Universe

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In this paper, we investigate cosmological models of the extended Chaplygin gas in a universe governed by Horava-Lifshitz gravity. The equation of state for an extended Chaplygin gas is a (n + 2)-variable equation determined by A n , α, and B. In this work, we are interested to the case of second order (n = 2) equation of state which recovers quadratic barotropic equation of state. In that case there are four free parameters. We solve conservation equation approximately and obtain energy density in terms of scale factor with mentioned free parameters. Under some assumptions we relate free parameters to each other to have only one free independent parameter (A 2 ). It help us to obtain explicit expression for energy density in terms of scale factor. The allowed values of the second order extended Chaplygin gas parameter is fixed using the recent astrophysical and cosmological observational data. Thermodynamics of the model investigated based on the first and second law of thermodynamics.

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Observational constraints on modified Chaplygin gas in Horava–Lifshitz gravity with dark radiation

Cited by 11 publications

References 69 publications

Exploring Late‐Time Cosmic Acceleration with Eos Parameterizations in Horava‐Lifshitz Gravity via Baryon Acoustic Oscillations

Exploring Late‐Time Cosmic Acceleration with Eos Parameterizations in Horava‐Lifshitz Gravity via Baryon Acoustic Oscillations

Roles of Modified Chaplygin-Jacobi and Chaplygin-Abel Gases in FRW Universe

Extended Chaplygin gas in Horava–Lifshitz gravity

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