Cosmology of a generalised version of holographic dark energy in presence of bulk viscosity and its inflationary dynamics through slow roll parameters

Chakraborty, Gargee; Chattopadhyay, Surajit

doi:10.1142/s0218271820500248

Cited by 23 publications

(4 citation statements)

References 65 publications

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“…We propose to carry out a similar viscous cosmology under the purview of modified theories of gravity in future with the background evolution as Barrow HDE. While concluding we would like to draw the attention of the readers to the previously published two works [22,23] by the authors of the present paper, where the inflationary cosmology was demonstrated through a scalar field model and a generalised version of HDE. In a similar manner we propose to investigate the slow roll parameters under the consideration of Barrow HDE with NO cut-off as the fluid responsible for the inflationary expansion.…”

Section: Discussionmentioning

confidence: 95%

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Thermodynamics of Barrow Holographic Dark Energy with Specific Cut-Off

et al. 2021

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Motivated by the work of Saridakis (Phys. Rev. D102, 123525 (2020)), the present study reports the cosmological consequences of Barrow holographic dark energy (HDE) and its thermodynamics. The literature demonstrates that dark energy (DE) may result from electroweak symmetry breaking that triggers a phase transition from early inflation to late-time acceleration. In the present study, we incorporated viscosity in the Barrow HDE. A reconstruction scheme is presented for the parameters associated with Barrow holographic dark energy under the purview of viscous cosmology. The equation of state (EoS) parameter is reconstructed in this scenario and quintessence behaviour is observed. Considering Barrow HDE as a specific case of Nojiri–Odintsov (NO) HDE, we have observed quintom behaviour of the EoS parameter and for some values of n the EoS has been observed to be very close to −1 for the current universe. The generalised second law of thermodynamics has come out to be valid in all the scenarios under consideration. Physical viability of considering Barrow HDE as a specific case of NO HDE is demonstrated in this study. Finally, it has been observed that the model under consideration is very close to ΛCDM and cannot go beyond it.

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Section: Discussionmentioning

confidence: 95%

“…The simplest candidate of DE is cosmological constant (Λ), characterised by EoS parameter w = −1 [13]. Various DE models have been reviewed in the literature [11,12,[14][15][16][17][18][19][20][21][22][23][24][25][26]. From References [27,28], currently the DE percentage is 68.3%.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of Barrow Holographic Dark Energy with Specific Cut-Off

et al. 2021

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“…It is noted that there are also other proposals of the cutoff scale such as using higher-order derivative of the Hubble parameter as the cutoff scale and etc. [121][122][123][124].…”

Section: Introductionmentioning

confidence: 99%

Cosmology in holographic non-minimal derivative coupling theory: constraints from inflation and variation of gravitational constant

Phichayoot¹,

Gumjudpai²,

Kritpetch³

et al. 2022

Preprint

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We consider a cosmological model of non-minimal derivative coupling (NMDC) to gravity with holographic effect from Bekenstein-Hawking entropy using Hubble horizon IR cutoff. Holographic parameter c is considered constant with value in a range, 0 ≤ c < 1. The NMDC effect is considered either as modification in kinetic scalar field or in gravitational constant. The NMDC effect allows gravitational constant to be time-varying. Since the NMDC effect is cosmological, definition of holographic density should include time-varying part of the gravitational constant. The NMDC part reduces strength of gravitational constant for κ > 0 and opposite for κ < 0. The holographic part enhances gravitational strength. Slow-roll parameters are derived. We use spectral index and tensor-to-scalar ratio to test the model against CMB constraint. Number of e-folding is chosen to be N ≥ 60. Power-law scalar potentials, V = V0φ n with n = 2, 4, and exponential potential, V = V0 exp (−βφ) are considered. Combined parametric plots of κ and φ show that the allowed regions of the power spectrum index and of the tensor-to-scalar ratio are not overlapping. NMDC inflation is ruled out and the holographic NMDC inflation is also ruled out for 0 < c < 1. NMDC significantly changes major anatomy of the dynamics, i.e. it gives new late-time attractor trajectories in acceleration regions. The holographic part clearly affects pattern of trajectories. However, for the holographic part to affect shape of the acceleration region, the NMDC field must be in presence. To constrain the model at late time, variation of gravitational constant is considered. Gravitationalwave standard sirens and supernovae data give a constraint, Ġ/G|t 0 < ∼ 3 × 10 −12 year −1 [142] which, for this model, results in 10 −12 year −1 > ∼ −κ φ φ/M 2 P . Positive κ is favored and greater c 2 results in lifting up lower bound of κ.

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“…The DE and DM models developed by Odintsov 2005, 2006a) were treated as imperfect fluids. A plethora of literatures has suggested to us that the bulk viscous pressure plays a major role in the late time acceleration of the Universe (Brevik et al 2004(Brevik et al , 2010(Brevik et al , 2015Chakraborty & Chattopadhyay 2020a,c,b, 2021. The late time acceleration is not the only accelerated phase of the Universe.…”

Section: Introductionmentioning

confidence: 99%

Viscous holographic f(Q) cosmology with some versions of holographic dark energy with generalized cut-offs

Chakraborty¹,

Chattopadhyay²,

Güdekli³

2021

Res. Astron. Astrophys.

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The work reported in this paper demonstrates the cosmology of f(Q) gravity and the reconstruction of various associated parameters with different versions of holographic dark energy with generalized cut-offs, where Q = 6 H 2. The Universe is considered to be filled with viscous fluid characterized by a viscous pressure Π = – 3 H ξ, where ξ = ξ 0 + ξ 1 H + ξ 2 ( H ˙ + H 2 ) and H is the Hubble parameter. Considering the power law form of expansion, we have derived the expression of f(Q) under a non-viscous holographic framework and it is then extended to viscous cosmological settings with extended generalized holographic Ricci dark energy. The forms of f(Q) for both the cases are found to be monotonically increasing functions of Q. In the viscous holographic framework, f(Q) is reconstructed as a function of cosmic time t and is found to stay at a positive level with Nojiri-Odintsov cut-off. In these cosmological settings, the slow roll parameters are computed and a scope of exit from inflation and quasi-exponential expansion are found to be available. Finally, it is observed that warm inflationary expansion can be obtained from this model.

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Cosmology of a generalised version of holographic dark energy in presence of bulk viscosity and its inflationary dynamics through slow roll parameters

Cited by 23 publications

References 65 publications

Thermodynamics of Barrow Holographic Dark Energy with Specific Cut-Off

Thermodynamics of Barrow Holographic Dark Energy with Specific Cut-Off

Cosmology in holographic non-minimal derivative coupling theory: constraints from inflation and variation of gravitational constant

Viscous holographic f(Q) cosmology with some versions of holographic dark energy with generalized cut-offs

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