Large-scale instability in interacting dark energy and dark matter fluids

Abstract

If dark energy interacts with dark matter, this gives a new approach to the coincidence problem. But interacting dark energy models can suffer from pathologies. We consider the case where the dark energy is modelled as a fluid with constant equation of state parameter w. Non-interacting constant-w models are well behaved in the background and in the perturbed universe. But the combination of constant w and a simple interaction with dark matter leads to an instability in the dark sector perturbations at early times: the curvature perturbation blows up on super-Hubble scales. Our results underline how important it is to carefully analyze the relativistic perturbations when considering models of coupled dark energy. The instability that we find has been missed in some previous work where the perturbations were not consistently treated. The unstable mode dominates even if adiabatic initial conditions are used. The instability also arises regardless of how weak the coupling is. This non-adiabatic instability is different from previously discovered adiabatic instabilities on small scales in the strong-coupling regime.

15 pages, 5 figures. New reference; published version

References in corpus (39)

• Dynamics of dark energy
• Cosmological Perturbation Theory in the Synchronous vs. Conformal Newtonian Gauge
• Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges
• Perturbations in k-inflation
• Transition of the dark energy equation of state in an interacting holographic dark energy model
• Scaling solutions in general non-minimal coupling theories
• Interacting Quintessence
• Interacting quintessence solution to the coincidence problem
• The end of unified dark matter?
• The cosmon model for an asymptotically vanishing time-dependent cosmological ``constant''
• Probing the Coupling between Dark Components of the Universe
• Probing dark energy perturbations: the dark energy equation of state and speed of sound as measured by WMAP
• Dynamics of dark energy with a coupling to dark matter
• Interacting holographic dark energy model in non-flat universe
• Super-acceleration as Signature of Dark Sector Interaction
• Observational constraints on interacting quintessence models
• Large-scale curvature and entropy perturbations for multiple interacting fluids
• Dark Interactions and Cosmological Fine-Tuning
• Self-similar cosmological solutions with a non-minimally coupled scalar field
• Challenges for scaling cosmologies
• On the stability of Dark Energy with Mass-Varying Neutrinos
• Cosmological coincidence problem in interacting dark energy models
• A Low CMB Quadrupole from Dark Energy Isocurvature Perturbations
• Growth of perturbations in dark matter coupled with quintessence
• Matter density perturbations in interacting quintessence models
• Interacting Quintessence, Cosmic Acceleration and the Coincidence Problem
• Duality Cascade in Brane Inflation
• Decaying Cold Dark Matter Model and Small-Scale Power
• Dynamics of Interacting Quintessence Models: Observational Constraints
• Neutrino Dark Energy -- Revisiting the Stability Issue
• Perturbations in cosmologies with a scalar field and a perfect fluid
• The Adiabatic Instability on Cosmology's Dark Side
• Cosmological nonlinear hydrodynamics with post-Newtonian corrections
• Cosmological Constraints on Invisible Decay of Dark Matter
• Gauge-Invariant Initial Conditions and Early Time Perturbations in Quintessence Universes
• Stable Models of superacceleration
• Quintessence From The Decay of a Superheavy Dark Matter
• Decaying Cold Dark Matter and the Evolution of the Cluster Abundance
• Probing dark energy with gamma-ray bursts

Cited by in corpus (312)

• In the Realm of the Hubble tension $-$ a Review of Solutions
• Cosmology and Fundamental Physics with the Euclid Satellite
• Cosmology and fundamental physics with the Euclid satellite
• Dark Matter and Dark Energy Interactions: Theoretical Challenges, Cosmological Implications and Observational Signatures
• Non-minimal dark sector physics and cosmological tensions
• Approaches to Understanding Cosmic Acceleration
• Interacting dark energy in the early 2020s: a promising solution to the $H_0$ and cosmic shear tensions
• Tale of stable interacting dark energy, observational signatures, and the $H_0$ tension
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Dynamics of interacting dark energy
• Cosmological Evolution With Interaction Between Dark Energy And Dark Matter
• Probing the interaction between dark matter and dark energy in the presence of massive neutrinos
• Interacting scenarios with dynamical dark energy: observational constraints and alleviation of the $H_0$ tension
• Linear and nonlinear interactions in the dark sector
• Dark coupling
• Interacting dark energy with time varying equation of state and the $H_0$ tension
• Revisiting a negative cosmological constant from low-redshift data
• Observational constraints on an interacting dark energy model
• Stability of the curvature perturbation in dark sectors' mutual interacting models
• Interacting Dark Energy -- constraints and degeneracies
• Can the $H_0$ tension be resolved in extensions to $\Lambda$CDM cosmology?
• Constraining Interactions in Cosmology's Dark Sector
• Testing the Interaction between Dark Energy and Dark Matter with Planck Data
• Dark sector interaction: a remedy of the tensions between CMB and LSS data
• New constraints on Coupled Dark Energy from Planck
• Models of coupled dark matter to dark energy
• Interacting Dark Energy after DESI Baryon Acoustic Oscillation measurements
• A combined analysis of the $H_0$ late time direct measurements and the impact on the Dark Energy sector
• Constraints on the Coupling between Dark Energy and Dark Matter from CMB data
• Tensions in the dark: shedding light on Dark Matter-Dark Energy interactions
• The Growth of Structure in Interacting Dark Energy Models
• Testing the interaction between dark energy and dark matter via latest observations
• Constraints on Interacting Dark Energy Models from the DESI Baryon Acoustic Oscillation and DES Supernovae Data
• Alleviating the $H_0$ and ${\sigma }_8$ anomalies with a decaying dark matter model
• Cosmological constraints on interacting dark energy with redshift-space distortion after Planck data
• Large-scale Stability and Astronomical Constraints for Coupled Dark-Energy Models
• Observational constraints on sign-changeable interaction models and alleviation of the $H_0$ tension
• Dynamical Systems Perspective of Cosmological Finite-time Singularities in $f(R)$ Gravity and Interacting Multifluid Cosmology
• Coupled dark matter-dark energy in light of near Universe observations
• The Parameterized Post-Friedmannian Framework for Interacting Dark Energy Theories
• Adiabatic initial conditions for perturbations in interacting dark energy models
• The imprint of the interaction between dark sectors in large scale cosmic microwave background anisotropies
• Constraint on Coupled Dark Energy Models from Observations
• Velocities as a probe of dark sector interactions
• The dark degeneracy and interacting cosmic components
• Signature of the interaction between dark energy and dark matter in observations
• On the large-scale instability in interacting dark energy and dark matter fluids
• Nonlinear interacting cosmological models after Planck 2018 legacy release and the $H_0$ tension
• Field theoretic interpretations of interacting dark energy scenarios and recent observations
• Novel approach towards the large-scale stable Interacting Dark-Energy models and their Astronomical Bounds
• Cosmological constraints on a decomposed Chaplygin gas
• Listening to the sound of dark sector interactions with gravitational wave standard sirens
• 2021-$H_0$ Odyssey: Closed, Phantom and Interacting Dark Energy Cosmologies
• New Cosmic Accelerating Scenario without Dark Energy
• Effects of dark sectors' mutual interaction on the growth of structures
• Dark energy with non-adiabatic sound speed: initial conditions and detectability
• Parametrized Post-Friedmann Framework for Interacting Dark Energy
• On phenomenological models of dark energy interacting with dark matter
• Large-scale stable interacting dark energy model: Cosmological perturbations and observational constraints
• Interacting Dark Energy in a closed universe
• Finite-time Cosmological Singularities and the Possible Fate of the Universe
• Dynamics of interacting dark energy model in Einstein and Loop Quantum Cosmology
• Dark calling Dark: Interaction in the dark sector in presence of neutrino properties after Planck CMB final release
• Constraining early and interacting dark energy with gravitational wave standard sirens: the potential of the eLISA mission
• Dark Coupling and Gauge Invariance
• Interacting quintessence from a variational approach Part II: derivative couplings
• Bouncing cosmologies with dark matter and dark energy
• Dark sectors with dynamical coupling
• Testing coupled dark energy with large scale structure observation
• Exploring the full parameter space for an interacting dark energy model with recent observations including redshift-space distortions: Application of the parametrized post-Friedmann approach
• Interacting quintessence from a variational approach Part I: algebraic couplings
• Dark sector interaction and the supernova absolute magnitude tension
• All-inclusive interacting dark sector cosmologies
• Testing models of vacuum energy interacting with cold dark matter
• Scalar-Fluid theories: cosmological perturbations and large-scale structure
• Reconstructing the dark sector interaction with LISA
• Covariantizing the interaction between dark energy and dark matter
• Effects of Anisotropic Stress in Interacting Dark Matter - Dark Energy Scenarios
• Scattering of Dark Matter and Dark Energy
• Irreversible thermodynamic description of interacting dark energy - dark matter cosmological models
• A Consistent View of Interacting Dark Energy from Multiple CMB Probes
• Cosmological constraints on parametrized interacting dark energy
• Cosmological Fluids with Logarithmic Equation of State
• Revisit of the interacting holographic dark energy model after Planck 2015
• Quintessence with quadratic coupling to dark matter
• Soundness of Dark Energy properties
• Theoretical Priors On Modified Growth Parametrisations
• Late time transitions in the quintessence field and the $H_0$ tension
• Dawn of the dark: unified dark sectors and the EDGES Cosmic Dawn 21-cm signal
• Remedy of some cosmological tensions via effective phantom-like behavior of interacting vacuum energy
• Late time interacting cosmologies and the Hubble constant tension
• Looking for interactions in the cosmological dark sector
• Scalar-field dark energy nonminimally and kinetically coupled to dark matter
• Can Dark Matter Decay in Dark Energy?
• Coupled dark energy with perturbed Hubble expansion rate
• Weighing neutrinos in the scenario of vacuum energy interacting with cold dark matter: application of the parameterized post-Friedmann approach
• Interacting Holographic Viscous Dark Energy Model
• Constraints on interacting dark energy models through cosmic chronometers and Gaussian process
• The imprint of the interaction between dark sectors in galaxy clusters
• Quantifying the $S_8$ tension and evidence for interacting dark energy from redshift-space distortion measurements
• Unveiling dark fifth forces with linear cosmology
• Dark degeneracy I: Dynamical or interacting dark energy?
• A double take on early and interacting dark energy from JWST
• Cosmological constraints on coupled dark energy
• Exploring neutrino mass and mass hierarchy in the scenario of vacuum energy interacting with cold dark matter
• Dark D-brane Cosmology
• Probing elastic interactions in the dark sector and the role of $S_8$
• Cosmological direct detection of dark energy: non-linear structure formation signatures of dark energy scattering with visible matter
• Interacting Dark Energy: Possible Explanation for 21-cm Absorption at Cosmic Dawn
• Analytic study of the effect of dark energy-dark matter interaction on the growth of structures
• Probing the imprint of interacting dark energy on very large scales
• Coupled three-form dark energy
• Distinguishing interacting dark energy from wCDM with CMB, lensing, and baryon acoustic oscillation data
• Large-scale (in-) stability Analysis of an Exactly Solved Coupled Dark-Energy Model
• Constraints on active and sterile neutrinos in an interacting dark energy cosmology
• Future CMB cosmological constraints in a dark coupled universe
• Quasi-local variables in spherical symmetry: numerical applications to dark matter and dark energy sources
• Scalar-Fluid interacting dark energy: cosmological dynamics beyond the exponential potential
• Cosmological constraints of phantom dark energy models
• Constraints on primordial isocurvature perturbations and spatial curvature by Bayesian model selection
• Probing the interaction between dark energy and dark matter with the parametrized post-Friedmann approach
• Probing the sign-changeable interaction between dark energy and dark matter with DESI baryon acoustic oscillations and DES supernovae data
• Interacting 3-form dark energy models: distinguishing interactions and avoiding the Little Sibling of the Big Rip
• Dark energy: investigation and modeling
• Understanding the phenomenology of interacting dark energy scenarios and their theoretical bounds
• Multi-interacting dark energy and its cosmological implications
• Late-Time constraints on Interacting Dark Energy: Analysis independent of $H_0$, $r_d$ and $M_B$
• Slow-Roll Suppression of Adiabatic Instabilities in Coupled Scalar Field-Dark Matter Models
• An extensive investigation of the Generalised Dark Matter model
• Interacting dark energy: clarifying the cosmological implications and viability conditions
• Scaling solutions and weak gravity in dark energy with energy and momentum couplings
• Tightening the reins on non-minimal dark sector physics: Interacting Dark Energy with dynamical and non-dynamical equation of state
• Interacting Cosmological Fluids and the Coincidence Problem
• Entropic cosmology in a dissipative universe
• Variable sound speed in interacting dark energy models
• Dynamical Dark sectors and Neutrino masses and abundances
• Cosmology of Lorentz fiber-bundle induced scalar-tensor theories
• Quintessential inflation: A tale of emergent and broken symmetries
• Effects of time-varying $\beta$ in SNLS3 on constraining interacting dark energy models
• The effect of Dark Matter and Dark Energy interactions on the peculiar velocity field and the kinetic Sunyaev-Zel'dovich effect
• Unified Dark Matter models with fast transition
• Metastable dark energy models in light of Planck 2018: Alleviating the $H_0$ tension
• Unified Dark Fluid with Constant Adiabatic Sound Speed and Cosmic Constraints
• Cosmological Perturbations in Models of Coupled Dark Energy
• Impacts of gravitational-wave standard siren observations from Einstein Telescope and Cosmic Explorer on weighing neutrinos in interacting dark energy models
• Future weak lensing constraints in a dark coupled universe
• Quintessence with Yukawa Interaction
• Quantifying the impacts of future gravitational-wave data on constraining interacting dark energy
• Are $H_0$ and ${\sigma }_8$ tensions generic to present cosmological data?
• Exploring neutrino mass and mass hierarchy in interacting dark energy models
• Probing the sign-changeable interaction between dark energy and dark matter with current observations
• A closer look at interacting dark energy with statefinder hierarchy and growth rate of structure
• Forecasting Interacting Vacuum-Energy Models using Gravitational Waves
• Free-streaming and Coupled Dark Radiation Isocurvature Perturbations: Constraints and Application to the Hubble Tension
• Cosmological perturbations in an effective and genuinely phantom dark energy Universe
• Assisted coupled quintessence
• A Study of Finite-time Singularities of Loop Quantum Cosmology Interacting Multifluids
• A Generalized Interacting Tsallis Holographic Dark Energy Model and its thermodynamic implications
• J-PAS: forecasts on interacting dark energy from baryon acoustic oscillations and redshift-space distortions
• Dark energy with a gradient coupling to the dark matter fluid: cosmological dynamics and structure formation
• Theoretical and observational bounds on some interacting vacuum energy scenarios
• Dynamical dark energy confronted with multiple CMB missions
• Exploration of interacting dynamical dark energy model with interaction term including the equation-of-state parameter: alleviation of the $H_0$ tension
• Fixed points in interacting dark energy models
• Coupled quintessence and the impossibility of an interaction: a dynamical analysis study
• A Model for Dark Energy decay
• Observational constraints and predictions of the interacting dark sector with field-fluid mapping
• Exploiting the Einstein Telescope to solve the Hubble tension
• Background evolution and growth of structures in interacting dark energy through dynamical system analysis
• Origin of Delta N_eff as a Result of an Interaction between Dark Radiation and Dark Matter
• Models of vacuum energy interacting with cold dark matter: Constraints and comparison
• Exploring interacting holographic dark energy in a perturbed universe with parameterized post-Friedmann approach
• Breaking parameter degeneracy in interacting dark energy models from observations
• A model-independent reconstruction of dark sector interactions
• Physical vs phantom dark energy after DESI: thawing quintessence in a curved background
• Velocity-dependent interacting dark energy and dark matter with a Lagrangian description of perfect fluids
• CMB Temperature and Matter Power Spectrum in a Decay Vacuum Dark Energy Model
• Dynamics of three-form dark energy with dark matter couplings
• Interacting dark energy from the joint analysis of the power spectrum and bispectrum multipoles with the EFTofLSS
• General formulation of cosmological perturbations in scalar-tensor dark energy coupled to dark matter
• The integrated Sachs-Wolfe effect in cosmologies with coupled dark matter and dark energy
• IWDM: The fate of an interacting non-cold dark matter $-$ vacuum scenario
• Constraints on scalar and tensor perturbations in phenomenological and two-field inflation models: Bayesian evidences for primordial isocurvature and tensor modes
• Weak lensing predictions for coupled dark energy cosmologies at non-linear scales
• The BINGO Project VII: Cosmological Forecasts from 21cm Intensity Mapping
• A global fit study on the new agegraphic dark energy model
• The Classical and Loop Quantum Cosmology Phase Space of Interacting Dark Energy and Superfluid Dark Matter
• Model independent constraints on mass-varying neutrino scenarios
• Growth of structure in interacting vacuum cosmologies
• Deep connection between f(R) gravity and the interacting dark sector model
• Notes on interacting holographic dark energy model in a closed universe
• Constraints on a decomposed dark fluid with constant adiabatic sound speed by jointing the geometry test and growth rate after Planck data
• Perturbations in a scalar field model with virtues of $\Lambda$CDM
• CMB and matter power spectra with non-linear dark-sector interactions
• J-PAS: forecasts on interacting vacuum energy models
• A search for sterile neutrinos in interacting dark energy models using DESI baryon acoustic oscillations and DES supernovae data
• A note on interacting holographic dark energy with a Hubble-scale cutoff
• Archimedean-type force in a cosmic dark fluid: I. Exact solutions for the late-time accelerated expansion
• Dark Matter-Dark Energy Interaction and the Shape of Cosmic Voids
• Reexploration of interacting holographic dark energy model: Cases of interaction term excluding the Hubble parameter
• Flat limits of curved interacting cosmic fluids
• Constraints on neutrino mass in the scenario of vacuum energy interacting with cold dark matter after Planck 2018
• On the growth of perturbations in interacting dark energy and dark matter fluids
• Constraining the interaction between dark sectors with future HI intensity mapping observations
• The signature of the scattering between dark sectors in large scale cosmic microwave background anisotropies
• Modelling non-dust fluids in cosmology
• IDECAMB: an implementation of interacting dark energy cosmology in CAMB
• Reconciling $S_8$: Insights from Interacting Dark Sectors
• Non-Linear Matter Power Spectrum Modeling in Interacting Dark Energy Cosmologies
• Archimedean-type force in a cosmic dark fluid: II. Qualitative and numerical study of a multistage Universe expansion
• Dynamics of Dirac-Born-Infeld dark energy interacting with dark matter
• Interacting dark sector from the trace-free Einstein equations: cosmological perturbations with no instability
• Cosmic sign-reversal: non-parametric reconstruction of interacting dark energy with DESI DR2
• Limits on the parameters of the equation of state for interacting dark energy
• Measuring cosmic curvature with non-CMB observations
• Observational constraints on the interacting dark energy - dark matter (IDM) cosmological models
• Unmodified Gravity
• Dark energy versus modified gravity: Impacts on measuring neutrino mass
• Mass Varying Neutrinos, Quintessence, and the Accelerating Expansion of the Universe
• Discrimination between Lambda-CDM, quintessence, and modified gravity models using wide area surveys
• Electron mass variation from dark sector interactions and compatibility with cosmological observations
• III. Interacting Dark Energy: Summary of Models, Pathologies, and Constraints
• Differentiating dark interactions with perturbation
• Biases on cosmological parameters by general relativity effects
• Testing distance duality with CMB anisotropies
• On detecting interactions in the dark sector with H(z) data
• Generalized Logarithmic Equation of State in Classical and Loop Quantum Cosmology Dark Energy-Dark Matter Coupled Systems
• Holographic dark energy described at the Hubble length
• Forecast Analysis on Interacting Dark Energy Models from Future Generation PICO and DESI Missions
• Singularities in cosmologies with interacting fluids
• Testing Dark Matter Clustering with Redshift Space Distortions
• Hints of Neutrino Dark Matter scattering in the CMB? Constraints from the Marginalized and Profile Distributions
• Density perturbation in an interacting holographic dark energy model
• Can dark matter-dark energy interaction alleviate the Cosmic Coincidence Problem?
• Effects of a time-varying color-luminosity parameter $\beta$ on the cosmological constraints of modified gravity models
• Instability in interacting dark sector: An appropriate Holographic Ricci dark energy model
• Planckian discreteness as seeds for cosmic structure
• On the interacting dark energy scenarios $-$ the case for Hubble constant tension
• Unphysical properties in a class of interacting dark energy models
• Multi-fluid cosmology in Einstein gravity: analytical solutions
• Constraints on interacting dark energy revisited: implications for the Hubble tension
• The Integrated Sachs-Wolfe Effect in Interacting Dark Matter-Dark Energy Models
• Rapid Oscillatory quintessence with variable equation of state parameter in non minimal derivative coupling model
• Interacting Scalar fields: Dark matter and early dark energy
• Stable Large-Scale Perturbations in Interacting Dark-Energy Model
• A gauge-invariant approach to interactions in the dark sector
• Reconstructing the interaction between the dark matter and holographic dark energy
• Majorana Neutrino Superfluidity and Stability of Neutrino Dark Energy
• Structure Formation in Various Dynamical Dark Energy Scenarios
• Dark Matter Decaying into a Fermi Sea of Neutrinos
• Dark Degeneracy in DESI DR2: Interacting or Evolving Dark Energy?
• Examining the Viability of Phantom Dark Energy
• The Integrated Sachs-Wolfe Effect in the Bulk Viscous Dark Energy Model
• Dissecting kinetically coupled quintessence: phenomenology and observational tests
• Observational constraints on interactions between dark energy and dark matter with momentum and energy transfers
• Neutrino Dark Energy With More Than One Neutrino Species
• Interacting phantom dark energy: new accelerating scaling attractors
• Linear Density Perturbations in Multifield Coupled Quintessence
• Revisiting the Instability Problem of Interacting Dark Energy Model in the Parametrized Post-Friedmann Framework
• Evidence of dark energy in different cosmological observations
• Perturbed dark energy: classical scalar field versus tachyon
• Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
• II. Non-Linear Interacting Dark Energy: Analytical Solutions and Theoretical Pathologies
• Non-adiabatic perturbations in multi-component perfect fluids
• Interactive mixture of inhomogeneous dark fluids driven by dark energy: a dynamical systems analysis
• Degeneracy between primordial non-Gaussianity and interaction in the dark sector
• Interacting parametrized post-Friedmann method
• I. Linear Interacting Dark Energy: Analytical Solutions and Theoretical Pathologies
• Mass varying neutrinos with different quintessence potentials
• Two Dynamical Scenarios for Binned Master Sample Interpretation
• Stability analysis of an interacting holographic dark energy model
• Probing Interacting Dark Sector with the next generation of gravitational-wave detectors
• Coupled Quintessence scalar field model in light of observational datasets
• Reconstruction of the interaction term between dark matter and dark energy using SNe Ia
• Scalar field descriptions of two dark energy models
• Dark energy from the motions of neutrinos
• Late-Time Anisotropy Sourced by a 2-Form Field Non-Minimally Coupled to Cold Dark Matter
• Chaotic interactions between dark matter and dark energy
• Dark energy-dark matter interactions as a solution to the $S_8$ tension
• What if gravity becomes really repulsive in the future?
• The Viability of Phantom Dark Energy as a Quantum Field in 1st-Order FLRW Space
• One-loop power spectrum corrections in interacting dark energy cosmologies
• Dark Energy in the DESI Era: A Brief Review of Evidence, Beyond-$\Lambda$CDM Interpretations, and Tensions
• Growth rate of matter perturbations as a probe of large-scale magnetism
• Evolution of cosmological perturbations in the models with interacting dynamical dark energy
• A varying Dark Energy effective speed of sound parameter in the phantom Universe
• Constraints on Metastable Dark Energy Decaying into Dark Matter
• The Matter Power Spectrum of Dark Energy Models and the Harrison-Zel'dovich Prescription
• Stochastic dark matter: Covariant Brownian motion from Planckian discreteness
• Generalized Holographic Cosmology: low-redshift observational constraint
• Perturbation in an interacting dark universe
• Neutrino Dark Energy in Grand Unified Theories
• Vainshtein screening in Horndeski theories nonminimally and kinetically coupled to ordinary matter
• Probing the independence within the dark sector in the fluid approximation
• The frozen vanilla model: Exploring dark sector interactions with delta effective theories
• Particle Production Scenario in an Algebraically Coupled Quintessence Field with a Dark Matter Fluid
• Coupled Dark Energy field variation
• Classical, quantum, and phenomenological aspects of dark energy models
• Evolution equations dynamical system of the Lemaître--Tolman--Bondi metric containing coupled dark energy
• Interacting Quintessence and Growth of Structure
• Dark sector interactions in the $w\to -1$ limit: velocity locking in pure momentum exchange models
• Dynamics of a spherically symmetric inhomogeneous coupled dark energy model with coupling term proportional to non relatvistic matter
• Scalar Perturbations in Nonsingular Universes from Interacting Vacuum
• Qualitative probe of interacting dark energy with redshift-space distortions
• Dark energy with oscillatory tracking potential: Observational Constraints and Perturbative effects
• Probing the Type 3 interacting dark-energy model using matter pairwise velocity
• Kinetic coupled tachyon: A dynamical system analysis
• Phantom cosmology with arbitrary potential: New accelerating scaling attractors
• Probing Interacting Dark Sectors with upcoming Post-Reionization and Galaxy Surveys
• New tests of dark sector interactions from the full-shape galaxy power spectrum
• Crunching, Bouncing, and Cyclical Cosmologies from Dark Sector Interactions
• Perturbations In Some Dark Energy Models