Slow roll parameters in braneworld cosmologies

We present a general slow-roll formalism within braneworld-motivated cosmologies with non-standard effective Friedmann equations. Full towers of parameters involving either the inflaton potential or the Hubble parameter are constructed and the dynamics of non-tachyonic and tachyonic fields are considered in detail: exact cosmological solutions and the inflationary attractor condition are provided. We compare scalar-driven and tachyon-driven accelerating eras through slow-roll correspondence and the observational imprint on early-universe structures.

04.50.+h
98.80.Cq
membrane model
inflaton: potential
Hubble constant
inflation: attractor
Gauss-Bonnet term
dimension: 5
tachyon
field theory: scalar

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