2023-08-29 04:00:13
The Universe is constantly expanding. But, how to accurately measure this speed of expansion in this space without landmarks? Thanks to new advances in research, we are getting closer to more precise answers.
Conceptual diagram of this research. Signals from supernovae, quasars and gamma-ray bursts reach us, in the Milky Way (The Milky Way (also called “our galaxy”, or sometimes …), making it possible to measure cosmological parameters.
Credit: NAOJ.
The Universe is expanding, it is a recognized fact. However, determining at what rate requires finding reliable benchmarks. Imagine a candle (The candle is an object generally used to illuminate, composed of a body…) moving away: it seems less luminous, although its luminosity (Luminosity designates the characteristic of what emits or reflects. ..) intrinsic remains unchanged. Likewise, distant objects appear less bright. If we know their initial luminosity, it is possible to deduce their distance.
Objects of known luminosity, called “standard candles”, are used as benchmarks. An international team, led by Maria Giovanna Dainotti from the National Astronomical Observatory of Japan (NAOJ) and Giada Bargiacchi from the Scuola Superiore Meridionale in Naples, has opened up a new field (A field corresponds to a notion of defined space:) of research. With the help of NAOJ supercomputers managed by Kazunari Iwasaki, they employed new statistical methods (Statistics is both a formal science, a method and a technique. It…).
By analyzing data from different standard candles – supernovae, quasars, gamma-ray bursts – the team was able to map large areas of the Universe. The results obtained reduce the uncertainty of the key parameters by 35%. These precisions will help to predict the future of the Universe: infinite expansion or withdrawal into itself.
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#markers #precise
