Cosmological constraints from current CMB and SN 1a data: a brute force 8 parameter analysis

摘要

We describe constraints on a ``standard'' 8 parameter open cold dark matter(CDM) model from the most recent CMB and SN1a data. Our parameters are thedensities of CDM, baryons, vacuum energy and curvature, the reionizationoptical depth, and the normalization and tilt for both scalar and tensorfluctuations. We find that although the possibility of reionization and gravitywaves substantially weakens the constraints on CDM and baryon density, tilt,Hubble constant and curvature, allowing e.g. a closed Universe, open modelswith vanishing cosmological constant are still strongly disfavored.