Authors

Citation

M. Le Dour et al., Cosmological constraints from the cosmic microwave background, ASTRON ASTR, 364(2), 2000, pp. 369-376

Citations number

68

Language

INGLESE

art.tipo

Article

Categorie Soggetti

Space Sciences

Journal title

ASTRONOMY AND ASTROPHYSICS

ISSN journal

0004-6361
→ ACNP

Volume

364

Issue

2

Year of publication

2000

Pages

369 - 376

Database

ISI

SICI code

0004-6361(200012)364:2<369:CCFTCM>2.0.ZU;2-2

Abstract

Using an approximate likelihood method adapted to band-power estimates, we
analyze the ensemble of first generation cosmic microwave background anisot
ropy experiments to deduce constraints over a six-dimensional parameter spa
ce describing Inflation-generated adiabatic, scalar fluctuations. The basic
preferences of simple Inflation scenarios are consistent with the data set
: flat geometries (Omega (tot) equivalent to 1 - Omega (kappa) similar to1)
and a scale-invariant primeval spectrum (n similar to 1) are favored. Mode
ls with significant negative curvature (Omega (tot) < 0.7) are eliminated,
while constraints on postive curvature are less stringent. Degeneracies amo
ng the parameters prevent independent determinations of the matter density
<Omega>(m), and the cosmological constant ii, and the Hubble constant H-o r
emains relatively unconstrained. We also iind that the height of the first
Doppler peak relative to the amplitude suggested by data at larger I indica
tes a high baryon content (Omega (b)h(2)), almost independently of the othe
r parameters. Besides the overall qualitative advance expected of the next
generation experiments, their improved dipole calibrations will be particul
arly useful for constraining the peak height. Our analysis includes a Goodn
ess-of-Fit statistic applicable to power estimates and which indicates that
the maximum likelihood model provides an acceptable fit to the data set.