Mar 18, 2024 07:04 PM
How did matter come to exist in our Universe?
https://bigthink.com/starts-with-a-bang/...ter-exist/
KEY POINTS: In all the particle physics reactions we've ever created, measured, or observed here on Earth, matter and antimatter can only ever be created or destroyed in equal amounts. But somehow, what emerged from the ashes of the hot Big Bang led to a matter-dominated Universe, with scarcely any antimatter around at all. This is one of the greatest mysteries in physics: the puzzle of why we live in a matter-dominated Universe, also known as the baryogenesis puzzle. Here's what science knows about it today... (MORE - details)
New research suggests that our universe has no dark matter
https://www.uottawa.ca/about-us/media/ne...ark-matter
PRESS RELEASE: A University of Ottawa study published today 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.
“The study's findings confirm that our previous work (“JWST early Universe observations and ΛCDM cosmology”) about the age of the universe being 26.7billion 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.
The study, Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features,was published in the peer-reviewed Astrophysical Journal.
https://bigthink.com/starts-with-a-bang/...ter-exist/
KEY POINTS: In all the particle physics reactions we've ever created, measured, or observed here on Earth, matter and antimatter can only ever be created or destroyed in equal amounts. But somehow, what emerged from the ashes of the hot Big Bang led to a matter-dominated Universe, with scarcely any antimatter around at all. This is one of the greatest mysteries in physics: the puzzle of why we live in a matter-dominated Universe, also known as the baryogenesis puzzle. Here's what science knows about it today... (MORE - details)
New research suggests that our universe has no dark matter
https://www.uottawa.ca/about-us/media/ne...ark-matter
PRESS RELEASE: A University of Ottawa study published today 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.
“The study's findings confirm that our previous work (“JWST early Universe observations and ΛCDM cosmology”) about the age of the universe being 26.7billion 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.
The study, Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features,was published in the peer-reviewed Astrophysical Journal.