A radical alternative to the standard picture of the cosmos is gaining attention after researchers at the University of Ottawa reported that it successfully matched several important astronomical observations. The model suggests that the Universe could be 26.7 billion years old, nearly twice the widely accepted age of 13.8 billion years, and that neither dark matter nor dark energy is needed to explain its behavior.
If further research supports these findings, the theory could offer a very different explanation for how the Universe evolved. It may also help resolve one of modern astronomy’s most puzzling discoveries: the existence of surprisingly large and mature galaxies at a time when the conventional model suggests they should barely have begun forming.
A Universe Without Dark Matter or Dark Energy
Throughout 2025 and 2026, Rajendra Gupta, an adjunct professor in the University of Ottawa’s Department of Physics, and postdoctoral researcher Dr. Nikolaos Samaras evaluated an alternative cosmological framework known as CCC+TL against several major astronomical observations.
The name stands for “covarying coupling constants plus tired light.” Rather than relying on dark matter and dark energy, the model proposes that some of the effects attributed to these mysterious components could result from changes over time in fundamental physical constants. These constants help determine how particles and forces interact.
For decades, astronomers have searched for direct evidence of dark matter and dark energy. Dark matter is thought to provide additional gravity that helps explain how galaxies move and how large cosmic structures hold together. Dark energy is the name given to whatever is causing the expansion of the Universe to accelerate. Although extensive observations support their gravitational and cosmological effects, neither component has been directly identified.
The prevailing cosmological framework, called ΛCDM, incorporates both. Despite its success in explaining a wide range of observations, it faces questions raised by the discovery of unexpectedly developed galaxies in the early Universe.
“Most emerging models explain only a limited set of observations,” Professor Gupta says. “A new model must not conflict with the pillars of cosmology and astrophysics, and our findings meet that challenge, including the yet-to-be-published Cosmic Microwave Background challenge.”
Testing such a fundamentally different theory requires more than adjusting the standard model. CCC+TL modifies the Einstein and Friedmann equations, which describe gravity and how the Universe expands. As a result, Gupta and Samaras had to develop equations and computer programs specifically adapted to their model for each test.
New Cosmology Model Passes Several Key Tests
The researchers report that CCC+TL produced results consistent with several major astronomical measurements. One important test involved the light elements created shortly after the Big Bang, including hydrogen and helium. The alternative model predicted abundances that matched those calculated using the standard cosmological framework.
It also agreed with cosmic chronometer measurements, which allow astronomers to reconstruct the history of cosmic expansion by comparing the ages of galaxies at different distances. These measurements provide an independent way to examine how the expansion rate has changed over billions of years.
Another significant test focused on the motion of galaxies. In a recent study published in Monthly Notices of the Royal Astronomical Society, the researchers examined all 175 galaxies in the SPARC database. They found that their model could reproduce the observed rotation curves without invoking dark matter.
Rotation curves describe how quickly stars and gas orbit at different distances from the centers of galaxies. Under conventional gravity, the visible matter alone generally cannot explain these motions, which is one of the major reasons scientists believe dark matter exists.
The team also investigated time dilation in observations of supernovae. Time dilation refers to the apparent stretching of events over time when viewed across vast cosmic distances. Their analysis offered additional support for CCC+TL, although the research paper remains under review.
Explaining Galaxy Motions Without Invisible Matter
The researchers also examined the Bullet Cluster, a famous system of colliding galaxy clusters that provides some of the strongest observational evidence for dark matter.
In this system, most of the ordinary matter is concentrated in extremely hot gas that emits X-rays. However, observations show that much of the gravitational effect is associated with the galaxies rather than the gas. The standard explanation is that invisible dark matter passed through the collision along with the galaxies.
Under CCC+TL, the additional gravitational effect predicted by the model also follows the galaxies instead of the hot gas, but without requiring dark matter. The researchers emphasize that this result is only an initial proof of concept and that more detailed investigations are necessary.
“Observations attributed to dark matter and dark energy likely originate from covarying coupling constants,” adds Professor Gupta, who examines this possibility further in a separate paper exploring the origin of dark matter and dark energy.
Could the Universe Be Twice as Old as We Thought?
Perhaps the most intriguing implication of the model involves the earliest galaxies ever observed.
Astronomers using the James Webb Space Telescope have discovered galaxies that appear surprisingly massive and mature for their early place in cosmic history. Their existence has prompted questions about how quickly stars and galaxies could have formed after the Big Bang.
CCC+TL offers a possible answer by giving the early Universe substantially more time to develop.
In the standard cosmological model, the Universe was approximately 300 million years old during the period known as cosmic dawn, when the first generations of stars and galaxies were emerging. At the same observed redshift, however, CCC+TL would place the Universe’s age at roughly 4.6 billion years.
Redshift measures how much light from a distant object has shifted toward longer, redder wavelengths. Astronomers use it to study distant galaxies and investigate earlier stages of cosmic history.
Under the alternative model, galaxies observed at extremely high redshifts would have had billions of additional years to grow. The researchers calculate that early galaxies would be approximately 12 times larger in both size and mass than predicted by standard cosmology, according to findings published in Galaxies 13, 115.
“Impossible early galaxies become predictable galaxies,” Professor Gupta explains. “We predict that galaxies exist well beyond the distances the James Webb Space Telescope has reached.”
James Webb Could Put the Radical Theory to the Test
Upcoming observations could provide an important opportunity to investigate this prediction.
The James Webb Space Telescope’s GLIMPSE program aims to search for extremely distant galaxies, potentially reaching redshifts greater than 50. These observations would probe an exceptionally early period in the Universe’s history under the standard cosmological framework.
According to conventional models, there may not have been enough time for large galaxies to assemble at such extreme redshifts. The CCC+TL model does not impose the same restriction because its cosmic timeline allows substantially more time for galaxies to develop.
Finding galaxies at these distances could therefore provide another important way to compare the competing explanations. However, such discoveries would not, by themselves, establish that the alternative model is correct.
Although the researchers report encouraging results across several major cosmological tests, CCC+TL remains an unconventional proposal that requires further independent examination. The standard cosmological model continues to explain a broad range of astronomical observations, and any replacement must ultimately demonstrate comparable or greater success.
For Gupta, the latest findings provide a reason to continue investigating the possibility that the Universe operates differently than scientists currently assume.
“The success should encourage astronomers to take the new model seriously. It is challenging to understand and apply, but we believe it extends the physics of the Universe beyond ΛCDM limits,” concludes Professor Gupta.
