A kinetically coupled tachyon dark energy model admits a new stable scaling attractor for a range of coupling and potential parameters, providing a mechanism to keep dark energy and dark matter densities comparable.
Cosmological Evolution of the Rolling Tachyon
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abstract
The cosmological effects of the tachyon rolling down to its ground state are discussed by coupling a simple effective field theory for the tachyon field to Einstein gravity. As the tachyon rolls down to the minimum of its potential the universe expands. Depending upon initial conditions, the scale factor may or may not start off accelerating, but ultimately it ceases to do so and the final flat spacetime is either static in the rest frame of the tachyon (if $k=0$) or (if $k=-1$) given by the Milne model.
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Kinetic coupled tachyon: A dynamical system analysis
A kinetically coupled tachyon dark energy model admits a new stable scaling attractor for a range of coupling and potential parameters, providing a mechanism to keep dark energy and dark matter densities comparable.