1205.1056 (Eduardo Guendelman et al.)

A two measure model of dark energy and dark matter    [PDF]

Eduardo Guendelman, Douglas Singleton, Nattapong Yongram

In this work we consider a gravitating scalar field, $\phi$ with a non-conventional kinetic term as in the string theory tachyon, an arbitrary potential, $V(\phi)$, and two measures -- a geometric measure ($\sqrt{-g}$) and a non-metric measure ($\Phi$). This model gives a unified picture of dark energy and dark matter. 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.

View original: http://arxiv.org/abs/1205.1056