All articles tagged with #expansion rate
Researchers at the University of Tokyo have used a new method involving gravitational lensing to measure the universe's expansion rate, providing evidence that the discrepancy known as the Hubble tension is likely due to real physics rather than measurement errors, with their findings aligning with current local measurements rather than early universe estimates.
A new study suggests that the universe's expansion may be slowing down rather than accelerating, challenging the current understanding of dark energy, by revealing that the brightness of Type Ia supernovae correlates with the age of their host galaxies, which could bias previous measurements of cosmic expansion.
The Dark Energy Spectroscopic Instrument (DESI) has analyzed its first-year data, providing unprecedented measurements of the expanding universe. With 5,000 robots, DESI is mapping the cosmos 11 billion years into the past, aiming to unravel the mysteries of dark energy. The data, six times larger than previous surveys, offers insights into the expansion rate and composition of the universe, potentially shedding light on the nature of dark energy and the early universe.
The "Hubble Tension," which refers to the discrepancy between the observed and predicted expansion rate of the universe, remains a mystery. The James Webb Space Telescope (JWST) has provided new measurements to refine the Hubble constant, but questions persist about the universe's rapid expansion and potential underlying cosmic phenomena. Webb's infrared vision has allowed for more precise observations of Cepheid variables, which are used as distance markers, and has confirmed the accuracy of previous Hubble measurements. However, the cause of the Hubble Tension, whether it be exotic dark energy, dark matter, a revision to our understanding of gravity, or measurement errors, remains unknown.
New data from NASA's James Webb Space Telescope (JWST) has confirmed and intensified the "Hubble tension," a discrepancy between two different methods of measuring the expanding rate of the universe. The JWST observations of Cepheid variable stars in nearby galaxies, combined with measurements of type Ia supernovae, have reduced uncertainties and validated previous findings from the Hubble Space Telescope. The data suggests that the expansion rate is around 67 km/s/Mpc, in contrast to the value of 73 km/s/Mpc obtained from the cosmic distance ladder method. The discrepancy deepens the mystery surrounding the true expansion rate of the universe.
A team led by University of Minnesota Twin Cities researchers has used a first-of-its-kind technique to measure the expansion rate of the universe, providing insight into a longstanding debate in the field and could help scientists more accurately determine the universe's age and better understand the cosmos. The researchers were able to calculate this value using data from a supernova discovered by Kelly in 2014—the first ever example of a multiply imaged supernova. The researchers' findings don't absolutely settle the debate, but they do provide more insight into the problem and bring physicists closer to obtaining the most accurate measurement of the universe's age.