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Title: Dark matter as a ghost free conformal extension of Einstein theory

We discuss ghost free models of the recently suggested mimetic dark matter theory. This theory is shown to be a conformal extension of Einstein general relativity. Dark matter originates from gauging out its local Weyl invariance as an extra degree of freedom which describes a potential flow of the pressureless perfect fluid. For a positive energy density of this fluid the theory is free of ghost instabilities, which gives strong preference to stable configurations with a positive scalar curvature and trace of the matter stress tensor. Instabilities caused by caustics of the geodesic flow, inherent in this model, serve as a motivation for an alternative conformal extension of Einstein theory, based on the generalized Proca vector field. A potential part of this field modifies the inflationary stage in cosmology, whereas its rotational part at the post inflationary epoch might simulate rotating flows of dark matter.
Authors:
 [1]
  1. Theory Department, Lebedev Physics Institute, Leninsky Prospect 53, Moscow, 119991 (Russian Federation)
Publication Date:
OSTI Identifier:
22369824
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 01; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; DEGREES OF FREEDOM; ENERGY DENSITY; GENERAL RELATIVITY THEORY; IDEAL FLOW; INSTABILITY; NONLUMINOUS MATTER; POTENTIAL FLOW; POTENTIALS; SCALARS; STRESSES; TENSORS; VECTOR FIELDS