Modelling galaxy halos using dark matter with pressure

Abstract

We investigate whether a dark matter with substantial amounts of pressure, comparable in magnitude to the energy density, could be a viable candidate for the constituent of dark matter halos. We find that galaxy halos models, consistent with observations of flat rotation curves, are possible for a variety of equations of state with anisotropic pressures. It turns out that the gravitational bending of light rays passing through such halos is very sensitive to the pressure. We propose that combined observations of rotation curves and gravitational lensing can be used to determine the equation of state of the dark matter. Alternatively, if the equation of state is known from other observations, rotation curves and gravitational lensing can together be used to test General Relativity on galaxy scales.

6 pages, two figures, to appear in Physical Review D

References in corpus (22)

• The Structure of Cold Dark Matter Halos
• Supersymmetric Dark Matter
• Cold and Fuzzy Dark Matter
• Cold collapse and the core catastrophe
• Non-Baryonic Dark Matter - Observational Evidence and Detection Methods
• Rotation Curves of Spiral Galaxies
• Modified Newtonian Dynamics as an Alternative to Dark Matter
• Can the clustered dark matter and the smooth dark energy arise from the same scalar field ?
• Repulsive Dark Matter
• The Dark Matter Distribution in Disk Galaxies
• Parameter constraints for flat cosmologies from CMB and 2dFGRS power spectra
• Non-Thermal Production of WIMPs and the Sub-Galactic Structure of the Universe
• Spherical Scalar Field Halo in Galaxies
• An alternative approach to the galactic dark matter problem
• Effect of halo modelling on WIMP exclusion limits
• Supermassive black holes in scalar field galaxy halos
• On the Space Time of a Galaxy
• Properties of Dark Matter Haloes
• On the density of Cold Dark Matter
• Status of Cold Dark Matter Cosmology
• Dynamics of a Dark Matter Field with a Quartic Self-Interaction Potential
• Current constraints on Cosmological Parameters from Microwave Background Anisotropies

Cited by in corpus (62)

• WIMP dark matter candidates and searches - current status and future prospects
• Can dark matter be a Bose-Einstein condensate?
• Can the galactic rotation curves be explained in brane world models?
• Galactic Potentials
• Unified Dark Matter Scalar Field Models
• Dissipation of dark matter
• Combining rotation curves and gravitational lensing: How to measure the equation of state of dark matter in the galactic halo
• Effective Fluid Description of the Dark Universe
• Effective field description of the Anton-Schmidt cosmic fluid
• Two-fluid dark matter models
• Features of galactic halo in a brane world model and observational constraints
• Cosmological evolution of finite temperature Bose-Einstein Condensate dark matter
• Viscous dark matter growth in (neo-)Newtonian cosmology
• Can extra dimensional effects replace dark matter ?
• The signature of dark energy perturbations in galaxy cluster surveys
• The Homogeneous Scalar Field and the Wet Dark Sides of the Universe
• Spherically symmetric problem on the brane and galactic rotation curves
• CLASH-VLT: Constraints on the Dark Matter Equation of State from Accurate Measurements of Galaxy Cluster Mass Profiles
• Anisotropic Fluid Cosmology: an Alternative to Dark Matter?
• Gravitational lensing in braneworld gravity: formalism and applications
• Gravitational lens optical scalars in terms of energy-momentum distributions
• Polytropic dark matter flows illuminate dark energy and accelerated expansion
• On extended sign-changeable interactions in the dark sector
• Dynamics of Particles Near Black Hole with Higher Dimensions
• Astrophysics of Bertrand Space-times
• Halos of Unified Dark Matter Scalar Field
• Scalar field haloes as gravitational lenses
• Dark Energy: The Shadowy Reflection of Dark Matter?
• Could pressureless dark matter have pressure?
• Remarks On The Spherical Scalar Field Halo In Galaxies
• Comments on "Modeling Galaxy Halos Using Dark Matter with Pressure"
• Galactic Dark Matter and Bertrand Space-times
• Wormhole solutions supported by interacting dark matter and dark energy
• Strong lensing by fermionic dark matter in galaxies
• Possible features of galactic halo with electric field and observational constraints
• Effective refractive index tensor for weak field gravity
• Revisiting perfect fluid dark matter: Observational constraints from our galaxy
• Spherically Symmetric Solutions in Macroscopic Gravity
• Gravity theory with a dark extra dimension
• Solving the Cusp-Core Problem with a Novel Scalar Field Dark Matter
• Testing DM halos using rotation curves and lensing: A warning on the determination of the halo mass
• Gravitational Collapse of Baryonic and Dark matter
• Constraint on dark matter central density in the Eddington inspired Born-Infeld (EiBI) gravity with input from Weyl gravity
• Self-gravitating fluid systems and galactic dark matter
• Interacting warm dark matter
• Galactic space-times in modified theories of gravity
• A new model for dark matter fluid sphere
• Cosmological perturbations in the $\Lambda$CDM-like limit of a polytropic dark matter model
• On the galactic rotation curves problem within an axisymmetric approach
• Low Mass Naked Singularities from Dark Core Collapse
• Effects of dark matter pressure on the ellipticity of cosmic voids
• Mass decomposition of SLACS lens galaxies in Weyl conformal gravity
• An f(R) model for dark matter: rotation curves and gravitational lensing
• Accelerated expansion of the Universe in the Presence of Dark Matter Pressure
• Lensing Stability and Scattering Phenomena in Anisotropic Black Hole Spacetimes in Plasma
• Gravitational lensing due to dark matter modelled by vector field
• On Strong Gravitational Lensing in Rotating Galactic Space-times
• On Dark Matter As A Geometric Effect in the Galactic Halo
• Dark matter candidate induced by Horndeski theory: dark matter halo and cosmological evolution
• Test of conformal theory of gravity as an alternative paradigm to dark matter hypothesis from gravitational lensing studies
• Stability analysis of orbital modes for a generalized Lane-Emden equation
• Exact Solutions with Asymptotically Flat Galactic Rotation Curves