Dynamical string tensions via a tension scalar induce de Sitter space on a brane and allow different-tension strings to serve as dark matter with hidden standard-model copies.
K-essence and kinetic gravity braiding models in two-field measure theory
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abstract
We show that, in the context of the two-field measure theory, any k-essence model leads to the existence of a fluid made of non-relativistic matter and cosmological constant that would explain the dark matter and dark energy problem at the same time. On the other hand, kinetic gravity braiding models can lead to different behaviors, such as phantom dark energy, stiff matter, and a cosmological constant. For stiff matter, there even exists the case where the scalar field does not have any effect in the dynamics of the Universe.
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Constructing de Sitter space and Dark Matter with Dynamical Tension Strings
Dynamical string tensions via a tension scalar induce de Sitter space on a brane and allow different-tension strings to serve as dark matter with hidden standard-model copies.