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March 15, 2024
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New research suggests that our universe has no dark matter
by Bernard Rizk, University of Ottawa
New research suggests that our universe has no dark matter Angular
diameter distance as a function of redshift in CCC+TL and LCDM
models. Credit: The Astrophysical Journal (2024). DOI: 10.3847/
1538-4357/ad1bc6
The current theoretical model for the composition of the universe is
that it's made of normal matter, dark energy and dark matter. A new
University of Ottawa study challenges this.
A study, published today in The Astrophysical Journal, challenges the
current model of the universe by showing that, in fact, it has no
room for dark matter.
In cosmology, the term "dark matter" describes all that appears not
to interact with light or the electromagnetic field, or that can only
be explained through gravitational force. We can't see it, nor do we
know what it's made of, but it helps us understand how galaxies,
planets and stars behave.
Rajendra Gupta, a physics professor at the Faculty of Science, used a
combination of the covarying coupling constants (CCC) and "tired
light" (TL) theories (the CCC+TL model) to reach this conclusion.
This model combines two ideas--about how the forces of nature decrease
over cosmic time and about light losing energy when it travels a long
distance. It's been tested and has been shown to match up with
several observations, such as about how galaxies are spread out and
how light from the early universe has evolved.
This discovery challenges the prevailing understanding of the
universe, which suggests that roughly 27% of it is composed of dark
matter and less than 5% of ordinary matter, remaining being the dark
energy.
[INS::INS]
Challenging the need for dark matter in the universe
"The study's findings confirm that our previous work ("JWST early
universe observations and LCDM cosmology") about the age of the
universe being 26.7 billion years has allowed us to discover that the
universe does not require dark matter to exist," explains Gupta.
"In standard cosmology, the accelerated expansion of the universe is
said to be caused by dark energy but is in fact due to the weakening
forces of nature as it expands, not due to dark energy."
"Redshifts" refer to when light is shifted toward the red part of the
spectrum. The researcher analyzed data from recent papers on the
distribution of galaxies at low redshifts and the angular size of the
sound horizon in the literature at high redshift.
"There are several papers that question the existence of dark matter,
but mine is the first one, to my knowledge, that eliminates its
cosmological existence while being consistent with key cosmological
observations that we have had time to confirm," says Gupta.
By challenging the need for dark matter in the universe and providing
evidence for a new cosmological model, this study opens up new
avenues for exploring the fundamental properties of the universe.
More information: Rajendra P. Gupta, Testing CCC+TL Cosmology with
Observed Baryon Acoustic Oscillation Features, The Astrophysical
Journal (2024). DOI: 10.3847/1538-4357/ad1bc6
Journal information: Astrophysical Journal
Provided by University of Ottawa
Citation: New research suggests that our universe has no dark matter
(2024, March 15) retrieved 6 October 2024 from https://phys.org/news/
2024-03-universe-dark.html
This document is subject to copyright. Apart from any fair dealing
for the purpose of private study or research, no part may be
reproduced without the written permission. The content is provided
for information purposes only.
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