Dark matter and dark energy interactions: theoretical challenges, cosmological implications and observational signatures

Wang, Bin; Abdalla, Élcio; Atrio-Barandela, F.; Pavón, Diego

doi:10.1088/0034-4885/79/9/096901

Cited by 523 publications

(445 citation statements)

References 430 publications

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“…where κ = 8π G/3, (14) follows from (13) by applying the second rule of (6), (9) and (10). This reinforces the interpretation of the q-scalars as averaged LTB scalars that mimic at every comoving shell r = r i the corresponding scalars of an FLRW background metric.…”

Section: Ltb Spacetimes Q-scalar Variables and Coupled Dark Energy Msupporting

confidence: 68%

“…We have chosen the following initial profiles to be used to probe the models for three different sets of free parameters α, w ρ (m) 0 = m 10 + m 11 − m 10 1 + tan(r ) 3 , m 10 = 0.00, m 11 = 9.10;…”

Section: Numerical Example Of Idealised Structure Formation Scenariosmentioning

confidence: 99%

“…Several models of coupled dark sources can also be found in the literature motivated by particle physics, thermodynamics, etc. [1,2,[7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Interactive mixture of inhomogeneous dark fluids driven by dark energy: a dynamical system analysis

2018

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We examine the evolution of an inhomogeneous mixture of non-relativistic pressureless cold dark matter (CDM), coupled to dark energy (DE) characterised by the equation of state parameter w < −1/3, with the interaction term proportional to the DE density. This coupled mixture is the source of a spherically symmetric Lemaître-Tolman-Bondi (LTB) metric admitting an asymptotic Friedman-Lemaître-Robertson-Walker (FLRW) background. Einstein's equations reduce to a 5-dimensional autonomous dynamical system involving quasi-local variables related to suitable averages of covariant scalars and their fluctuations. The phase space evolution around the critical points (past/future attractors and five saddles) is examined in detail. For all parameter values and both directions of energy flow (CDM to DE and DE to CDM) the phase space trajectories are compatible with a physically plausible early cosmic times behaviour near the past attractor. This result compares favourably with mixtures with interaction driven by the CDM density, whose past evolution is unphysical for DE to CDM energy flow. Numerical examples are provided describing the evolution of an initial profile that can be associated with idealised structure formation scenarios.

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Section: Ltb Spacetimes Q-scalar Variables and Coupled Dark Energy Msupporting

confidence: 68%

Section: Numerical Example Of Idealised Structure Formation Scenariosmentioning

confidence: 99%

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Interactive mixture of inhomogeneous dark fluids driven by dark energy: a dynamical system analysis

2018

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“…In order to avoid this doomsday scenario for the fate of the Universe, we consider an interaction between DM and DE (previous works on DM/3-form interaction include [10][11][12]). Models of interaction between DM and DE have long since been proposed, and an argument of natureless can be made for such interactions: if little is know about the properties of DM and DE, then why would we disregard the possibility that the two fluids that dominate the energy content of the Universe interact [23]?…”

Section: Introductionmentioning

confidence: 99%

3-Form Cosmology: Phantom Behaviour, Singularities and Interactions

2017

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Abstract:The latest cosmological observations by the Planck collaboration (and combined with others) are compatible with a phantom-like behaviour (w < −1) for the dark energy equation of state that drives the current acceleration of the Universe. With this mindset, we look into models where dark energy is described by a 3-form field minimally coupled to gravity. When compared to a scalar field, these models have the advantage of more naturally accommodating a cosmological-constant and phantom-like behaviours. We show how the latter happens for a fairly general class of positive-valued potentials, and through a dynamical system approach, we find that in such cases the 3-form field leads the Universe into a Little Sibling of the Big Rip singular event into the future. In this work, we explore the possibility of avoiding such singularity via an interaction in the dark sector between cold dark matter and the 3-form field. For the kind of interactions considered, we deduce a condition for replacing the LSBR by a late time de Sitter phase. For specific examples of interactions that meet this condition, we look for distinctive imprints in the statefinder hierarchy {S 3(1) ; S 4 (1) }, {S 3 (1) ; S 5 (1) }, and in the growth rate of matter, (z), through the composite null diagnostic (CND).

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“…In this sense, some proposals introduce the possibility of an interaction between dark matter and dark energy, which may reveal new features of both components (for a recent review see [2]). Indeed, several interactions have been suggested, where basically the full Lagrangian contains a particular interaction term, including non-minimally coupled theories [3].…”

Section: Introductionmentioning

confidence: 99%

Cosmological future singularities in interacting dark energy models

et al. 2016

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The existence of interactions between dark matter and dark energy has been widely studied, since they can fit well the observational data and may provide new physics through such an interaction. In this work we analyze these models and investigate their potential relation with future cosmological singularities. We find that every future singularity found in the literature can be mapped into a singularity of the interaction term, that we call Q-singularity, where the energy flow between the dark components diverges. Furthermore, this framework allows to identify a new type of future singularity induced by the divergence of the first derivative of the dark energy equation of state parameter.PACS numbers: 95.35.+d, 95.36.+x, 04.20.Dw

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Dark matter and dark energy interactions: theoretical challenges, cosmological implications and observational signatures

Cited by 523 publications

References 430 publications

Interactive mixture of inhomogeneous dark fluids driven by dark energy: a dynamical system analysis

Interactive mixture of inhomogeneous dark fluids driven by dark energy: a dynamical system analysis

3-Form Cosmology: Phantom Behaviour, Singularities and Interactions

Cosmological future singularities in interacting dark energy models

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