LambdaCDM model with Broken Scale Invariance confronted with observations

Details LambdaCDM model with Broken Scale Invariance confronted with observations LambdaCDM model with Broken Scale Invariance confronted with observations

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.162l&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We studied in details a class of spatially flat models with cold dark matter (CDM), a cosmological constant and a broken-scale-invariant (BSI) steplike primordial spectrum of adiabatic perturbations in which the inflaton potential has a rapid change of its first derivative. The matter power spectrum can account for a feature at k = 0.05 hMpc^{-1}. Best fits with the observational data are obtained for currently favoured cosmological parameters (OmegaLambda ~= 0.7, h ~= 0.7) and an inverted step (less power on large scales). These models can produce a gravitational waves spectrum of arbitrary amplitude. Observations allow models with a large contribution: C^T10 / C^S10 <= 1. Using polarisation measurements on the precision level scheduled for Planck, it is possible the extract the ``step'' parameters with very high accuracy.

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