Scalar-Fluid theories: cosmological perturbations and large-scale structure

Abstract

Recently a new Lagrangian framework was introduced to describe interactions between scalar fields and relativistic perfect fluids. This allows two consistent generalizations of coupled quintessence models: non-vanishing pressures and a new type of derivative interaction. Here the implications of these to the formation of cosmological large-scale structure are uncovered at the linear order. The full perturbation equations in the two cases are derived in a unified formalism and their Newtonian, quasi-static limit is studied analytically. Requiring the absence of an effective sound speed for the coupled dark matter fluid restricts the Lagrangian to be a linear function of the matter number density. This still leaves new potentially viable classes of both algebraically and derivatively interacting models wherein the coupling may impact the background expansion dynamics and imprint signatures into the large-scale structure.

1+30 pages, a figures

References in corpus (29)

• Dynamics of dark energy
• Cosmology and the Fate of Dilatation Symmetry
• Large-scale instability in interacting dark energy and dark matter fluids
• Dynamics of dark energy with a coupling to dark matter
• Generalized curvature-matter couplings in modified gravity
• Cosmology and Astrophysical Constraints of Gauss-Bonnet Dark Energy
• Quintessence and phantom cosmology with non-minimal derivative coupling
• A unifying description of dark energy
• Gauss-Bonnet Quintessence: Background Evolution, Large Scale Structure and Cosmological Constraints
• Screening Modifications of Gravity through Disformally Coupled Fields
• The matter power spectrum in f(R) gravity
• Dark energy from modified F(R)-scalar-Gauss-Bonnet gravity
• Effective Theory of Interacting Dark Energy
• The Parameterized Post-Friedmannian Framework for Interacting Dark Energy Theories
• Quintessential inflation with canonical and noncanonical scalar fields and Planck 2015 results
• On the large-scale instability in interacting dark energy and dark matter fluids
• On phenomenological models of dark energy interacting with dark matter
• Neutrino Dark Energy -- Revisiting the Stability Issue
• Disformal couplings and the dark sector of the universe
• Interacting quintessence from a variational approach Part II: derivative couplings
• Interacting quintessence from a variational approach Part I: algebraic couplings
• Inhomogeneous vacuum energy
• Viable Palatini-f(R) cosmologies with generalized dark matter
• Covariantizing the interaction between dark energy and dark matter
• Shaken, not stirred: kinetic mixing in scalar-tensor theories of gravity
• Probing the imprint of interacting dark energy on very large scales
• Distinguishing interacting dark energy from wCDM with CMB, lensing, and baryon acoustic oscillation data
• Dynamics of non-minimally coupled perfect fluids
• The effective theory of fluids at NLO and implications for dark energy

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• Listening to the sound of dark sector interactions with gravitational wave standard sirens
• Recovering a MOND-like acceleration law in mimetic gravity
• Scalar-field dark energy nonminimally and kinetically coupled to dark matter
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• Multidimensionality of the Hubble tension: the roles of ${\Omega }_m$ and ${\omega }_c$
• Cosmological direct detection of dark energy: non-linear structure formation signatures of dark energy scattering with visible matter
• Scalar-Fluid interacting dark energy: cosmological dynamics beyond the exponential potential
• Scaling solutions and weak gravity in dark energy with energy and momentum couplings
• Cosmological dynamics of scalar fields with kinetic corrections: Beyond the exponential potential
• Dark energy with a gradient coupling to the dark matter fluid: cosmological dynamics and structure formation
• The Einstein static universe in Scalar-Fluid theories
• J-PAS: Forecasts for dark matter - dark energy elastic couplings
• Velocity-dependent interacting dark energy and dark matter with a Lagrangian description of perfect fluids
• General formulation of cosmological perturbations in scalar-tensor dark energy coupled to dark matter
• Extended Phase Space Analysis of Interacting Dark Energy Models in Loop Quantum Cosmology
• Kinetically coupled dark energy
• J-PAS: forecasts on interacting vacuum energy models
• Dynamical stability in models where dark matter and dark energy are non-minimally coupled to curvature
• Dynamical Stability in presence of non-minimal derivative dependent coupling of $k$-essence field with a relativistic fluid
• Suppressed cosmic growth in coupled vector-tensor theories
• Disformally coupled inflation
• Lagrangian description of cosmic fluids: mapping dark energy into unified dark energy
• On-shell Lagrangian of an ideal gas
• Perfect fluid in Lagrangian formulation due to generalized three-form field
• Momentum transfer in the dark sector and lensing convergence in upcoming galaxy surveys
• FLRW accelerating universe with interactive dark energy
• An FLRW interacting dark energy model of the Universe
• Linear Density Perturbations in Multifield Coupled Quintessence
• Observational constraints on interactions between dark energy and dark matter with momentum and energy transfers
• Extended Chameleons
• Coupled dark energy model inspired from general conformal transformation
• Cosmological fluids with boundary term couplings
• Distinguishing Coupled Dark Energy Models with Neural Networks
• On Evidence for Elastic Interactions in the Dark Sector
• Effective field theory of coupled dark energy and dark matter
• Vainshtein screening in Horndeski theories nonminimally and kinetically coupled to ordinary matter
• Non-linear structure formation with elastic interactions in the dark sector
• End equilibrium state of a spherical gravitational collapse in the presence of matter and scalar field
• Particle Production Scenario in an Algebraically Coupled Quintessence Field with a Dark Matter Fluid
• Cosmological dynamical systems of non-minimally coupled fluids and scalar fields
• Multi-fluid Theory and Cosmology: A Convective Variational Approach to Interacting Dark-Sector
• Quintessence-Chameleon transitions in anisotropic Kiselev model of neutron stars
• Revisiting observational constraints on coupled exponential quintessence with energy and momentum transfers: degeneracy with massive neutrinos