Physics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phrvd..49.6319p&link_type=abstract
Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 49, Issue 12, 15 June 1994, pp.6319-6326
Physics
21
Particle-Theory And Field-Theory Models Of The Early Universe
Scientific paper
We study numerically a model of double inflation with two massive scalar fields and no interaction potential. Such models display a non-scale-invariant spectrum when the heavy mass mh>>ml, the light mass. The spectrum of adiabatic perturbations is studied numerically for 10<=p≡mh/ml<=25 for which there is no pronounced intermediate stage between the two inflations. In that case we find that the contribution of the light scalar field to the spectrum k3/2Φ(k), where Φ(k) is a rms gravitational potential, is dominant on all scales where the transition from the upper to the lower ``plateau'' takes place. Normalization to COBE DMR yields mh~3×10-6 Mp. When the ``step'' is located around 10h-1100 Mpc, we get acceptable biasing parameters 2.30<=b<=2.72. However, the model has sensibly less power on intermediate scales than standard CDM, where the latter is known to give acceptable results. This will severely constrain the parameters of the model.
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