High Redshift Supernovae: Cosmological Implications

TL;DR

This paper reviews high-redshift supernovae measurements, confirming an accelerating universe driven by dark energy with a cosmological constant around 0.7, and discusses potential systematic differences in supernova properties over time.

Contribution

It provides a comprehensive review of cosmological parameters derived from supernova data and explores the implications of possible evolution in supernova properties.

Findings

Universe is accelerating due to dark energy.

Cosmological constant Omega_Lambda~0.7 confirmed.

Potential evolution of supernova properties discussed.

Abstract

We review the findings for the values of the cosmological parameters as derived from high-redshift SNIa measurements. The most recent results confirm the picture of a non-empty inflationary Universe that is consistent with a cosmological constant Omega_Lambda~0.7. This implies that the expansion of the Universe is currently accelerated by the action of some mysterious dark energy. We also discuss the possibility and the consequences of the fact that SNIa may not be "perfect" standard candles, in the sense of having properties in the early Universe that are systematically different from those they have at the present times.