[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Barrow entropic dark energy: A member of generalized holographic dark energy family

Statefinder diagnosis for interacting Tsallis holographic dark energy models with ω−ω′ pair

A useful method, known as statefinder diagnostic, which may differentiate one dark energy (DE) model from others is applied in this work to a holographic dark energy (HDE) model from Tsallis entrop...

Diagnosing Tsallis holographic dark energy models with statefinder and ω − ω′ pair

We have analyzed the Barrow holographic dark energy (BHDE) in the framework of the flat FLRW Universe by considering the various estimations of Barrow exponent $\triangle$. Here we define BHDE, by applying the usual holographic principle at a cosmological system, for utilizing the Barrow entropy rather than the standard Bekenstein-Hawking. To understand the recent accelerated expansion of the universe, considering the Hubble horizon as the IR cut-off. The cosmological parameters, especially the density parameter ($\Omega_{_D}$), the equation of the state parameter ($\omega_{_D}$), energy density ($\rho_{_{D}}$) and the deceleration parameter($q$) are studied in this manuscript and found the satisfactory behaviors. Moreover, we additionally focus on the two geometric diagnostics, the statefinder $(r,s)$ and $O_{m}(z)$ to discriminant BHDE model from the $\Lambda CDM$ model. Here we determined and plotted the trajectories of evolution for statefinder $(r, s)$, $(r,q)$ and $O_{m}(z)$ diagnostic plane to understand the geometrical behavior of the BHDE model by utilizing Planck 2018 observational information. Finally, we have explored the new Barrow exponent $\triangle$, which strongly affects the dark energy equation of state that can lead it to lie in the quintessence regime, phantom regime, and exhibits the phantom-divide line during the cosmological evolution.

Barrow HDE model for statefinder diagnostic in FLRW universe

In this work, we propose a non-interacting model of Barrow holographic dark energy (BHDE) using Barrow entropy in a spatially flat FLRW Universe considering the IR cutoff as the Hubble horizon. We study the evolutionary history of important cosmological parameters, in particular, EoS $(\omega_{B})$, deceleration parameter and, the BHDE and matter density parameter and also observe satisfactory behaviours in the BHDE the model. In addition, to describe the accelerated expansion of the Universe the correspondence of the BHDE model with the quintessence scalar field has been reconstructed.

Barrow holographic dark energy with Hubble horizon as IR cutoff.

New holographic dark energy in bianchi- III universe with k-essence

In this paper, the proposed dark energy, Tsallis holographic dark energy (THDE), infrared cut-off with the Hubble horizon has been investigated in the Bianchi-I (axially symmetric) anisotropic model with a hybrid expansion law. It has been observed that the THDE is in tune with the accelerating Universe with equation of state (EoS) parameter (
 $$\omega _{\mathrm {T}}<-1/3$$
 ) in the k-essence region. We have used the statefinder diagnostic in our model. In addition, we try to accommodate the perspective of dark energy by the avenue of reconstructing the evolution of scalar field potential. We have considered the k-essence for the analysis of this reconstruction, showing the accelerated expansion at present.

Tsallis holographic dark energy in Bianchi-I Universe using hybrid expansion law with k -essence

In this work, we have examined the behavior of Bianchi-I (axially symmetric) matter-dominated and the anisotropic Universe with the proposed dark energy, Tsallis holographic dark energy (THDE), wit...

Tsallis holographic dark energy models in axially symmetric space time

A new class of dark energy model, known as “Tsallis agegraphic dark energy (TADE),” has been proposed using the holographic principle and Tsallis nonextensive entropy (Mod. Phys. Lett. A, 2019), co...

Shikha Srivastava

Papers

Barrow holographic dark energy with Hubble horizon as IR cutoff.

New holographic dark energy in bianchi- III universe with k-essence

Tsallis holographic dark energy in Bianchi-I Universe using hybrid expansion law with k -essence

Tsallis holographic dark energy models in axially symmetric space time

Statefinder diagnosis for Tsallis agegraphic dark energy model with ωD − ωD′ pair