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New research puts age of universe at 26.7 billion years, nearly twice as old as previously believed (phys.org)

submitted 1 year ago by L4s@lemmy.world to c/technology@lemmy.world

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New research puts age of universe at 26.7 billion years, nearly twice as old as previously believed::Our universe could be twice as old as current estimates, according to a new study that challenges the dominant cosmological model and sheds new light on the so-called "impossible early galaxy problem."

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[-] ProcurementCat@feddit.de 101 points 1 year ago* (last edited 1 year ago)

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

No, not really, because the age of that star is compatible with the age of the universe within the error bars.

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.

Galaxy formation is still an active area of research und different models predict different evolutionary rates

Instead, he proposes a constant that accounts for the evolution of the coupling constants.

That's exactly what Brans-Dicke theory is trying to do, and other modified theories of gravitation as well. Yet they can't explain stuff so well as Lambda CDM can.

Overall, tired light pretty much doesn't work well explaining the perfect black body behavior of the cosmic microwave background or surface brightnesses of galaxies.

https://en.m.wikipedia.org/wiki/Tired_light

[-] ashe@lemmy.starless.one 15 points 1 year ago

https://doi.org/10.1093/mnras/stad2032

I wasn't able to read the actual paper since it's behind a paywall, but it's not exclusively a TL model. They say this in the abstract:

Deep space observations of the James Webb Space Telescope (JWST) have revealed that the structure and masses of very early Universe galaxies at high redshifts (⁠z∼15), existing at ∼0.3 Gyr after the BigBang, may be as evolved as the galaxies in existence for ∼10 Gyr. The JWST findings are thus in strong tension with the ΛCDM cosmological model.

While tired light (TL) models have been shown to comply with the JWST angular galaxy size data, they cannot satisfactorily explain isotropy of the cosmic microwave background (CMB) observations or fit the supernovae distance modulus vs. redshift data well.

We present a model with covarying coupling constants (CCC), starting from the modified FLRW metric and resulting Einstein and Friedmann equations, and a CCC + TL hybrid model. They fit the Pantheon + data admirably, and the CCC + TL model is compliant with the JWST observations. [..] One could infer the CCC model as an extension of the ΛCDM model with a dynamic cosmological constant.

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this post was submitted on 15 Jul 2023

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