A new study presents a methodology to test the assumption of cosmic homogeneity and isotropy, known as the Cosmological Principle, by leveraging weak gravitational lensing—a light distortion effect described by general relativity—in astronomical images collected by new observatories such as the Euclid Space Telescope. Finding evidence of anomalies in the Cosmological Principle could have profound […]
The emergence of detector technologies with sensitivity to lower energies and improved resolution invites a shift of emphasis in particle-decay searches for massive neutral bosons: the kinematic limit of these reactions remains an unexplored realm where cosmologically-relevant particles may be waiting to be discovered. A case that illustrate this is the charged lepton flavour violating […]
When you are trying to solve one of the biggest conundrums in cosmology, you should triple check your homework. The puzzle, called the “Hubble Tension,” is that the current rate of the expansion of the universe is faster than what astronomers expect it to be, based on the universe’s initial conditions and our present understanding […]
early galaxy problem Author: Rajendra Gupta, Adjunct professor, Physics, L’Université d’Ottawa/University of Ottawa Early universe observations by the James Webb Space Telescope (JWST) cannot be explained by current cosmological models. These models estimate the universe to be 13.8 billion years in age, based on the big-bang expanding universe concept. My research proposes a model that […]
In a paper published today in Science, an international team reports on their discovery of the most ancient and distant fast radio burst located to date, about eight billion years old. The discovery smashes the team’s previous record by 50 per cent. It confirms that fast radio bursts (FRBs) can be used to measure the […]
Galaxies from the early Universe are more like our own Milky Way than previously thought, flipping the entire narrative of how scientists think about structure formation in the Universe. Using the James Webb Space Telescope (JWST), an international team of researchers has discovered that galaxies like our own Milky Way dominate throughout the universe and […]
Scientists working on the Dark SRF experiment at the U.S. Department of Energy’s Fermi National Accelerator Laboratory have demonstrated unprecedented sensitivity in an experimental setup used to search for theorized particles called dark photons. Researchers trapped ordinary, massless photons in devices called superconducting radio frequency cavities to look for the transition of those photons into […]
Thanks to data from a magnified, multiply imaged supernova, a team of researchers has successfully used a first-of-its-kind technique based on the Refsdal method to measure the expansion rate of the Universe. Their data provide insight into a longstanding debate in the field and could help scientists more accurately determine the Universe’s age and better […]
wavelike All the matter that has ever been detected accounts for a mere 4.9% of the Universe. Most of the cosmos is the dark universe: a mix of dark matter (26.8%) and dark energy (68.3%), both of which have so far proved impenetrable puzzles. The existence of dark matter has been inferred from the motion […]
Recent studies have revealed that the bending of light around massive galaxies is significantly smaller relative to theoretical expectations. This finding, the so-called lensing is low problem, has been interpreted as a breakdown of our cosmological model. Now, a team of scientists has found that the mismatch between theory and observations is actually caused by […]