Breaking the scale invariance of the primordial spectrum or not: the new WMAP data

Details Breaking the scale invariance of the primordial spectrum or not: the new WMAP data Breaking the scale invariance of the primordial spectrum or not: the new WMAP data

2006-04-13

arxiv.org/abs/astro-ph/0604287v1

Nuovo Cim.B122:67-73,2007

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures, 16 references

Scientific paper

10.1393/ncb/i2007-10040-5

It seems that new WMAP data requires a fit with a primordial spectrum containig small negative tilt index in addition to the featureless Harrison-Zeldovich- Peebles spectrum thus implying a broken scale invariance. We show that the data could be otherwise interpreted by a scale invariant primordial spectrum with the scale non-invariant evolution of density contrast using the Press-Schechter formalism. The estimate of the acceleration parameter, as a source of the inhomogeneity of spacetime, is made by searching for the minima of the deviation measure defined by the Press-Schechter mass functions for this interpretation compared to the assumptions implicit in the WMAP fit.

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