The present work is based on a parametric reconstruction of the deceleration parameter q(z) in model for spatially flat FRW universe filled with dark energy and non-relativistic matter. In cosmology, technique deals an attempt to build up by choosing some specific evolution scenario cosmological then estimate values parameters help different observational datasets. this paper, we have proposed logarithmic parametrization probe history universe. Using type Ia supernova, baryon acoustic...

We study the accelerated expansion phase of universe by using kinematic approach. In particular, deceleration parameter q is parametrized in a model-independent way. Considering generalized parametrization for q, we first obtain jerk j (a dimensionless third time derivative scale factor) and then confront it with cosmic observations. use latest observational dataset Hubble H(z) consisting 41 data points redshift range $$0.07 \le z 2.36$$ , larger than that covered Type Ia supernova. also...

In this paper, we have considered a spatially flat FRW universe filled with pressureless matter and dark energy (DE). We phenomenological parametrization of the deceleration parameter [Formula: see text] from this, reconstructed equation-of-state (EoS) for DE text]. This divergence-free is inspired one most popular EoS given by Barboza Alcaniz [see E. M. J. S. Alcaniz, Phys. Lett. B 666 (2008) 415]. Using combination datasets (Type Ia Supernova (SN Ia) + Hubble baryonic acoustic...

The motivation of the present work is to reconstruct a dark energy model through {\it dimensionless function} $X(z)$, which density in units its value. In this paper, we have shown that scalar field $\phi$ having phenomenologically chosen $X(z)$ can give rise transition from decelerated an accelerated phase expansion for universe. We examined possibility constraining various cosmological parameters (such as deceleration parameter and effective equation state parameter) by comparing our...

In this paper, we have proposed a generalized parametrization for the deceleration parameter q in order to study evolutionary history of universe. We shown that model can reproduce three well known q-parametrized models some specific values α. used latest compilation Hubble measurements obtained from cosmic chronometer (CC) method (in combination with local value constant H0) and Type Ia supernova (SNIa) data place constraints on parameters different found resulting dark energy equation...

This work is the reconstruction of interaction rate holographic dark energy whose infrared cut-off scale set by Hubble length. We have reconstructed between matter and for a specific parameterization effective equation-of-state parameter. obtained observational constraints on model parameters using latest type Ia supernova (SNIa), baryon acoustic oscillations (BAO) cosmic microwave background (CMB) radiation datasets. found that present model, increases with expansion remains positive...

The current study takes into account the evolution of a fractal universe with holographic dark energy through Barrow entropy and matter, i.e. without pressure, which interact one another mutual interaction. interaction term for this model is then rebuilt by using Hubble length as IR cut-off scale. We represent Nojiri–Odintsov generalized in universe. cosmological parameters that change over course cosmic history are looked at from early matter-dominated period late time acceleration. results...

In this present work, we try to build up a cosmological model using non-canonical scalar field within the framework of spatially flat FRW space–time. context, have considered four different parametrizations equation state parameter field. Under scenario, analytical solutions for various parameters been found out. It has that deceleration shows smooth transition from positive value some negative which indicates universe was undergoing an early followed by late time acceleration is essential...

Bearing holographic dark energy hypothesis in mind, the ability of vacuum describing current accelerated universe is studied framework Rastall theory. Here, addition to ordinary approach which it expected that this plays role energy, we also address a new where sum and term responsible for universe. We investigate cosmological outcomes using Tsallis entropy quantifying fields both mentioned approaches. The implications considering an interaction between various segments cosmic fluid have...

Abstract In this work, we have extended the analysis on generalized Chaplygin gas (GCG) model as unification of dark energy and matter. Specifically, shown that our consideration known new (NGCG) model, admits a scalar field description, which means there exist minimally coupled for given potential where equation state is NGCG. With use later property can construct slow-roll parameters derive corresponding values spectral indices tensor to perturbation density perturbations. We also studied...

We show that a phenomenological form of energy density for the scalar field can provide required transition from decelerated (q > 0) to accelerated expansion < phase universe. have used latest type Ia supernova (SNIa) and Hubble parameter datasets constrain model parameters. The best fit values obtained those are then applied reconstruct ωϕ(z), equation state field. results reconstructed forms q(z) ωϕ(z) do not differ much standard ΛCDM value at current epoch. Finally, functional relevant...

In this work, we construct an interacting model of the Rényi holographic dark energy in Brans-Dicke theory gravity using entropy a spatially flat Friedmann-Lemaître-Robertson-Walker Universe considering infrared cut-off as Hubble horizon. setup, then study evolutionary history some important cosmological parameters, particular, deceleration parameter, equation state and density parameter both nonflat scenarios also observe satisfactory behaviors these parameters model. We find that during...

Abstract In this paper, we investigate a non-canonical scalar field model in the background dynamics of anisotropic Locally Rotationally Symmetric (LRS) Bianchi type I universe where gravity is coupled minimally to which taken as dark energy and pressureless dust matter are main content universe. We perform dynamical system analysis characterize cosmological evolution with without interaction sector separately. First, convert equation into an autonomous ordinary differential equations by...

Abstract The present paper deals with a theoretical model for interacting Tsallis holographic dark energy (THDE) whose infrared cut-off scale is set by the Hubble length. interaction Q between sectors (dark and pressureless matter) of universe has been assumed to be non-gravitational in nature. functional form chosen such way that it reproduces well known most used interactions as special cases. We then study nature THDE density parameter, equation state deceleration parameter jerk this...

In this work, we study the evolution of a fractal universe composed Tsallis holographic dark energy (THDE) and pressureless matter that interact with each other through mutual interaction. We then reconstruct interaction term model by considering Hubble length as IR cut-off scale. also behavior different cosmological parameters during cosmic from early matter-dominated era until late-time acceleration. The present shows undergoes smooth transition decelerated to an accelerated phase...

We explore a unified model of dark matter and energy. This new is generalization the generalized Chaplygin gas known as (NGCG) model. study evolutions Hubble parameter distance modulus for under consideration standard ΛCDM compare that with observational datasets. Furthermore, we demonstrate two geometric diagnostics analyses including statefinder (r,s) Om(z) to discriminant NGCG from The trajectories evolution diagnostic planes are shown understand geometrical behavior by using different...

In this work, we have considered a non-canonical scalar field dark energy model in the framework of flat FRW background. It has also been assumed that matter sector interacts with through some interaction term. Using solutions for interacting model, investigated validity generalized second law (GSL) thermodynamics various scenarios using first and area thermodynamics. For purpose, two types horizons viz apparent horizon event universe thermodynamics, examined GSL on both horizons. Next,...

In this paper, we consider various dark energy models in the framework of a non-canonical scalar field with Lagrangian density form $$\mathcal{L}(\phi , X)=f(\phi )X{\left( \frac{X}{M^{4}_{Pl}}\right) }^{\alpha -1} - V(\phi )$$ which provides standard canonical model for $$\alpha =1$$ and $$f(\phi )=1$$ . particular model, carry out analysis =2$$ We then obtain cosmological solutions constant as well variable equation state parameter ( $$\omega _{\phi }(z)$$ ) energy. also perform data three...

In this work, we have proposed a general dark energy density parametrization to study the evolution of universe. We also constrained model parameters using combination Type Ia supernova (SNIa), baryonic acoustic oscillations (BAO), cosmic microwave background radiation (CMB) and observational $H(z)$ datasets. For dataset, used direct observations Hubble rate, from radial BAO size chronometer methods. Our result indicates that SNIa+$H(z)$+BAO/CMB dataset does not favour $\Lambda$CDM at more...

The present work deals with evolution of the fractal model universe in background homogeneous and isotropic FLRW space-time geometry. cosmic substrum is taken as perfect fluid barotropic equation state. A general prescription for deceleration parameter determined it examined whether may have more than one transition during monomial form function a scale factor. Finally, has been by making comparison observed data.