新しい研究により宇宙の年齢は2倍の267億年に

新しい研究は、宇宙の年齢が267億年である可能性があることを示唆しており、ラムダ-CDM一致モデルに基づいて広く受け入れられている137億年という推定に異議を唱えています。

新しい研究によると、私たちの宇宙は現在の推定の2倍古い可能性があり、一般的な宇宙論モデルに疑問を投げかけ、いわゆる「不可能な初期銀河問題」に新たな光を当てています。

著者のラジェンドラ・グプタ氏（オタワ大学理学部物理学准教授）は言う。

「私たちが新たに考案したモデルは、銀河の形成時間を数十億年延長し、宇宙の年齢はこれまでの推定の13.7年ではなく、267億年となった。」 ラジェンドラ・グプタ – オタワ大学理学部物理学科准教授。 クレジット: オタワ大学

天文学者や物理学者は何年もの間、宇宙の経過時間を測定することで宇宙の年齢を計算してきました。[{” attribute=””>Big Bang and by studying the oldest stars based on the redshift of light coming from distant galaxies. In 2021, thanks to new techniques and advances in technology, the age of our universe was thus estimated at 13.797 billion years using the Lambda-CDM concordance model.

However, many scientists have been puzzled by the existence of stars like the Methuselah that appear to be older than the estimated age of our universe and by the discovery of early galaxies in an advanced state of evolution made possible by the James Webb Space Telescope. These galaxies, existing a mere 300 million years or so after the Big Bang, appear to have a level of maturity and mass typically associated with billions of years of cosmic evolution. Furthermore, they’re surprisingly small in size, adding another layer of mystery to the equation.

Zwicky’s tired light theory proposes that the redshift of light from distant galaxies is due to the gradual loss of energy by photons over vast cosmic distances. However, it was seen to conflict with observations. Yet Gupta found that “by allowing this theory to coexist with the expanding universe, it becomes possible to reinterpret the redshift as a hybrid phenomenon, rather than purely due to expansion.”

“Our newly-devised model stretches the galaxy formation time by several billion years, making the universe 26.7 billion years old, and not 13.7 as previously estimated.”

— Rajendra Gupta, Adjunct professor of physics in the Faculty of Science at the University of Ottawa

In addition to Zwicky’s tired light theory, Gupta introduces the idea of evolving “coupling constants,” as hypothesized by Paul Dirac. Coupling constants are fundamental physical constants that govern the interactions between particles. According to Dirac, these constants might have varied over time. By allowing them to evolve, the timeframe for the formation of early galaxies observed by the Webb telescope at high redshifts can be extended from a few hundred million years to several billion years. This provides a more feasible explanation for the advanced level of development and mass observed in these ancient galaxies.

Moreover, Gupta suggests that the traditional interpretation of the “cosmological constant,” which represents dark energy responsible for the accelerating expansion of the universe, needs revision. Instead, he proposes a constant that accounts for the evolution of the coupling constants. This modification in the cosmological model helps address the puzzle of small galaxy sizes observed in the early universe, allowing for more accurate observations.

On July 7, 2023, the study, “JWST early Universe observations and 𝚲CDM cosmology,” was published in the Monthly Notices of the Royal Astronomical Society (MNRAS) by Oxford University Press.

Reference: “JWST early Universe observations and ΛCDM cosmology” by R Gupta, 7 July 2023, Monthly Notices of the Royal Astronomical Society.
DOI: 10.1093/mnras/stad2032