Extended phase space analysis of interacting dark energy models in loop quantum cosmology

Zonunmawia, Hmar; Khyllep, Wompherdeiki; Roy, Nandan; Dutta, Jibitesh

doi:10.1103/physrevd.96.083527

Cited by 17 publications

(17 citation statements)

References 86 publications

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“…(22)) and discarding it may lead to incomplete dynamics. For relevant recent work one can also see [42,43]. Again, it is interesting to observe that negative energy density does not always imply phantom behavior in general (one can see [40], [43] From the above constraint equation (22), it can be seen that one of the dimensionless density parameters is linearly independent.…”

Section: Dynamical System Analysis Of Rastall Modelmentioning

confidence: 86%

Linear growth index of matter perturbations in Rastall gravity

Khyllep

Dutta

2019

Physics Letters B

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Rastall gravity theory shows notable features consistent with physical observations in comparison to the standard Einstein theory. Recently, there has been a debate about the equivalence of Rastall gravity and general relativity.Motivated by this open issue, in the present work, we attempt to shed some light on this debate by analyzing the evolution of the Rastall based cosmological model at the background as well as perturbation level. Employing the dynamical system techniques, we found that at late times, the dynamics of the model resembles the ΛCDM model at the background level irrespective of the choice of Rastall's parameter. However, at the perturbation level, we found that the evolution of the growth index heavily depends on the Rastall's parameter and displays a significant deviation from the ΛCDM model. arXiv:1907.09221v1 [gr-qc]

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Section: Dynamical System Analysis Of Rastall Modelmentioning

confidence: 86%

Linear growth index of matter perturbations in Rastall gravity

Khyllep

Dutta

2019

Physics Letters B

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“…[18] for the case of mimetic gravity and variants thereof [19,20,21,22,23,24], and e.g. [25,26,27,28,29,30,31] for discussions in the context of other theories.…”

Section: Introductionmentioning

confidence: 99%

Listening to the sound of dark sector interactions with gravitational wave standard sirens

Yang

Vagnozzi

Valentino

et al. 2019

J. Cosmol. Astropart. Phys.

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We consider two stable Interacting Dark Matter -Dark Energy models and confront them against current Cosmic Microwave Background data from the Planck satellite. We then generate luminosity distance measurements from O(10 3 ) mock Gravitational Wave events matching the expected sensitivity of the proposed Einstein Telescope. We use these to forecast how the addition of Gravitational Wave standard sirens data can improve current limits on the Dark Matter -Dark Energy coupling strength (ξ). We find that the addition of Gravitational Waves data can reduce the current uncertainty by a factor of 5. Moreover, if the underlying cosmological model truly features Dark Matter -Dark Energy interactions with a value of ξ within the currently allowed 1σ upper limit, the addition of Gravitational Wave data would help disentangle such an interaction from the standard case of no interaction at a significance of more than 3σ. 98.80.Cq, 95.35.+d, 95.36.+x, 98.80.Es.

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“…Hence, these powerful methods have been extensively applied to analyse the evolution of several cosmological models, including many modified gravity scenarios (see e.g. [106][107][108][109][110][111][112][113][114][115][116][117][118][119][120][121][122][123][124] for some recent works).…”

Section: Introductionmentioning

confidence: 99%

Cosmological dynamics of mimetic gravity

Dutta

Khyllep

Saridakis

et al. 2018

J. Cosmol. Astropart. Phys.

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106

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We present a detailed investigation of the dynamical behavior of mimetic gravity with a general potential for the mimetic scalar field. Performing a phase-space and stability analysis, we show that the scenario at hand can successfully describe the thermal history of the universe, namely the successive sequence of radiation, matter, and dark-energy eras. Additionally, at late times the universe can either approach a de Sitter solution, or a scaling accelerated attractor where the dark-matter and dark-energy density parameters are of the same order, thus offering an alleviation of the cosmic coincidence problem. Applying our general analysis to various specific potential choices, including the power-law and the exponential ones, we show that mimetic gravity can be brought into good agreement with the observed behavior of the universe. Moreover, with an inverse square potential we find that mimetic gravity offers an appealing unified cosmological scenario where both dark energy and dark matter are characterized by a single scalar field, and where the cosmic coincidence problem is alleviated.

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Extended phase space analysis of interacting dark energy models in loop quantum cosmology

Cited by 17 publications

References 86 publications

Linear growth index of matter perturbations in Rastall gravity

Linear growth index of matter perturbations in Rastall gravity

Listening to the sound of dark sector interactions with gravitational wave standard sirens

Cosmological dynamics of mimetic gravity

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