2004/06/17 by Richard A. Battye, Battye, Richard A., the VSA Collaboration +1
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #Geophysics and Gravity Measurements #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0406394
to appear in `Exploring the Universe', proceedings of Rencontres de Moriond 2004
arxiv created 2004/06/17 · openalex publication_date 2004/06/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/24 · openalex updated_date 2026/07/28
We present estimates of parameters which model the primordial density\nfluctuations using CMB data from the VSA, 1st year WMAP, CBI and ACBAR along\nwith external priors from 2dF and the HST. Taken at face value there is\nsignificant evidence for a running spectral index when only scalar fluctuations\nare considered. The significance of this result is increased by the inclusion\nof tensors and, although the result is weakened by the inclusion of `running of\nthe running', the basic trend toward significantly negative running remains. We\ndiscuss the implications of this result and how it might be strengthened by\nfuture observations.\n