A two measure model of dark energy and dark matter

Abstract

In this work we construct a unified model of dark energy and dark matter. This is done with the following three elements: a gravitating scalar field, phi with a non-conventional kinetic term, as in the string theory tachyon; an arbitrary potential, V(phi); two measures -- a metric measure (sqrt{-g}) and a non-metric measure (Phi). The model has two interesting features: (i) For potentials which are unstable and would give rise to tachyonic scalar field, this model can stabilize the scalar field. (ii) The form of the dark energy and dark matter that results from this model is fairly insensitive to the exact form of the scalar field potential.

8 pages,no figures, revtex, typos corrected to match published version

References in corpus (8)

• Dark Matter: A Primer
• Dark energy from modified gravity with Lagrange multipliers
• Cosmological tachyon condensation
• Fine Tuning Free Paradigm of Two Measures Theory: K-Essence, Absence of Initial Singularity of the Curvature and Inflation with Graceful Exit to Zero Cosmological Constant State
• Absence of the Fifth Force Problem in a Model with Spontaneously Broken Dilatation Symmetry
• On the Foundations of the Two Measures Field Theory
• Phantom energy from graded algebras
• Physical Consequences of a Theory with Dynamical Volume Element

Cited by in corpus (9)

• Emergent Cosmology, Inflation and Dark Energy
• Fractional Einstein-Hilbert Action Cosmology
• Scale Symmetry Breaking From Total Derivative Densities and the Cosmological Constant Problem
• Dark energy and dark matter unification from dynamical space time: observational constraints and cosmological implications
• Dynamical system analysis for DBI dark energy interacting with dark matter
• Dynamics of Dirac-Born-Infeld dark energy interacting with dark matter
• K-essence and kinetic gravity braiding models in two-field measure theory
• Neutrino generated dynamical dark energy with no dark energy field
• Cosmology from multimeasure multifield model