English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report measurements of the mass density, Omega_M, andcosmological-constant energy density, Omega_Lambda, of the universe based onthe analysis of 42 Type Ia supernovae discovered by the Supernova CosmologyProject. The magnitude-redshift data for these SNe, at redshifts between 0.18and 0.83, are fit jointly with a set of SNe from the Calan/Tololo SupernovaSurvey, at redshifts below 0.1, to yield values for the cosmologicalparameters. All SN peak magnitudes are standardized using a SN Ia lightcurvewidth-luminosity relation. The measurement yields a joint probabilitydistribution of the cosmological parameters that is approximated by therelation 0.8 Omega_M - 0.6 Omega_Lambda ~= -0.2 +/- 0.1 in the region ofinterest (Omega_M <~ 1.5). For a flat (Omega_M + Omega_Lambda = 1) cosmology wefind Omega_M = 0.28{+0.09,-0.08} (1 sigma statistical) {+0.05,-0.04}(identified systematics). The data are strongly inconsistent with a Lambda = 0flat cosmology, the simplest inflationary universe model. An open, Lambda = 0cosmology also does not fit the data well: the data indicate that thecosmological constant is non-zero and positive, with a confidence of P(Lambda >0) = 99%, including the identified systematic uncertainties. The best-fit ageof the universe relative to the Hubble time is t_0 = 14.9{+1.4,-1.1} (0.63/h)Gyr for a flat cosmology. The size of our sample allows us to perform a varietyof statistical tests to check for possible systematic errors and biases. Wefind no significant differences in either the host reddening distribution orMalmquist bias between the low-redshift Calan/Tololo sample and ourhigh-redshift sample. The conclusions are robust whether or not awidth-luminosity relation is used to standardize the SN peak magnitudes.

Measurements of Ω and Λ from 42 High‐Redshift Supernovae