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Rewriting the Past and Future of the Universe – New Research Sheds Light on the Fate of Our Cosmos

October 19, 2023
in Science
Rewriting the Past and Future of the Universe – New Research Sheds Light on the Fate of Our Cosmos
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Signals From Supernovae, Quasars, and Gamma Ray Bursts Reach Earth in the Milky Way Galaxy

A conceptual diagram of this research. Signals from supernovae (bottom right inset), quasars (middle left inset), and gamma-ray bursts (top center inset) reach Earth in the Milky Way Galaxy (background), where we can use them to measure cosmological parameters. Credit: NAOJ

New research has improved the accuracy of the parameters governing the expansion of the Universe. More accurate parameters will help astronomers determine how the Universe grew to its current state, and how it will evolve in the future.

Challenges in Measuring Expansion

It is well established that the Universe is expanding. But with no landmarks in space, it is difficult to accurately measure how fast it is expanding. So, astronomers search for reliable landmarks. The same way a candle looks fainter as it gets farther away, even though the candle itself hasn’t changed, distant objects in the Universe look fainter.

If we know the intrinsic (initial) brightness of an object, we can calculate its distance based on its observed brightness. Objects of known brightness in the Universe that allow us to calculate the distance are called “standard candles.”

Innovative Methods and Diverse Data

An international team led by Maria Giovanna Dainotti, Assistant Professor at the National Astronomical Observatory of Japan (NAOJ), and Giada Bargiacchi, Ph.D. student at the Scuola Superiore Meridionale in Naples, with the aid of the supercomputing facilities at NAOJ run by Kazunari Iwasaki, Assistant Professor at NAOJ and member of the Center for Computational Astrophysics, ushered in a new research field by leveraging the use of a variety of new statistical methods to analyze data for various standard candles such as Supernovae, Quasars (powerful black holes consuming matter in the distant Universe), and Gamma Ray Bursts (sudden flashes of powerful radiation). Different standard candles are useful in different distant ranges, so combining multiple standard candles allowed the team to map larger areas of the Universe.

The new results reduce the uncertainty of key parameters by up to 35 percent. More accurate parameters will help determine whether the Universe will continue expanding forever, or eventually fall back in on itself.

Reference: “Quasars: Standard Candles up to z=7.5 with the Precision of Supernovae Ia” by M. G. Dainotti, G. Bargiacchi, A. Ł. Lenart, S. Nagataki and S. Capozziello, 9 June 2023, The Astrophysical Journal.
DOI: 10.3847/1538-4357/accea0

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/rewriting-the-past-and-future-of-the-universe-new-research-sheds-light-on-the-fate-of-our-cosmos/

Tags: Futurerewritingscience
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