Scalar perturbations in string-dilaton cosmology

Research paper by S. Capozziello, R. de Ritis

Indexed on: 12 Oct '07Published on: 12 Oct '07Published in: Il Nuovo Cimento B (1971-1996)


Scalar perturbative potentials are constructed on exact background solutions for string-dilaton cosmology. We deal with the string effective Lagrangian under the same standard of an Induced Gravity Theory non-minimally coupled with a scalar field (the dilaton) and apply the theory of gauge-invariant perturbations. The main results are that we are able to obtain density contrasts (δρ/ρ) which can be connected with the observations and to control the horizon crossing for the perturbation scales.