All articles tagged with #hubble constant
A distant Type I superluminous supernova, SN 2025wny at z=2.01, was gravitationally lensed by a foreground galaxy into four images arriving at different times. By analyzing these time delays and light curves, astronomers aim to refine measurements of the universe's expansion and shed light on dark energy, potentially addressing the Hubble tension.
Physicists propose using the faint, unresolved gravitational-wave background from countless distant black-hole mergers as an independent way to measure the expansion rate of the universe (the Hubble constant), potentially helping resolve the Hubble tension. Even without directly detecting this background, current data already place bounds on H0; upcoming detector upgrades could turn this into a precise measurement, offering a new tool for cosmology while highlighting limitations tied to population models and large uncertainties.
Physicists propose using the faint gravitational-wave background produced by countless distant black-hole mergers as a new, gravity-based method to measure the Hubble constant, offering an independent path to addressing the Hubble tension. Current data already constrain H0 by showing the backgroundās absence rules out low values; future detector upgrades could turn this into a direct measurement, potentially confirming or challenging existing cosmology without relying on electromagnetic distance ladders or the CMB.
A new method uses the faint gravitational-wave background from unresolved distant black hole mergersāthe stochastic sirenāto constrain the Hubble constant. By linking merger rates to the observable universeās size, a stronger background would indicate slower expansion; non-detections thus tighten limits, and when combined with data from individually observed mergers, the approach yields a more precise H0. With future, more sensitive detectors the gravitational-wave background could be detected and used to further refine cosmological measurements, potentially helping resolve the Hubble tension.
Scientists propose using the stochastic gravitational-wave backgroundāthe faint, background hum from countless distant mergersāto measure the Hubble constant, offering an independent, multiāmessenger approach that could help resolve the longāstanding Hubble tension as gravitationalāwave detectors grow more sensitive.
Researchers from the University of Illinois and University of Chicago propose the stochastic-siren method, using the gravitational-wave background from countless distant black-hole mergers to infer the Hubble constant. This independent approach can tighten expansion-rate measurements, rule out very slow cosmic expansion with current data, and become more powerful as gravitational-wave detectors improve and the background is detected, potentially helping resolve the Hubble tension.
An international collaboration unified multiple distance-measurement methods into a single statistical framework, achieving a 1% precise measurement of the Hubble constantāthe most accurate value to date. While the improved precision narrows uncertainties, it does not resolve the ongoing tension with early-universe predictions, underscoring the need for new physics or modifications to current cosmological models.
Astronomers using the James Webb Space Telescope under the VENUS program have identified two gravitationally lensed supernovas, SN Ares and SN Athena. The foreground galaxy cluster MJ0308 splits their light into multiple images; the delayed images will reach Earth in the futureāAres in about 60 years and Athena within the next 1ā2 yearsāproviding a rare, self-consistent way to measure cosmic distances and constrain the Hubble constant, potentially helping resolve the ongoing disagreement over the universeās 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.
An international team has demonstrated that pixelized strong-lensing modeling on galaxy clusters significantly improves the precision of measuring the Hubble constant, potentially resolving the existing tension in its current measurements and advancing high-precision cosmology.
Jim Baggott's book 'Discordance' explores the ongoing challenges and uncertainties in understanding the universe, focusing on the Hubble constant and the discrepancies in cosmological measurements, highlighting that modern cosmology remains an unfinished and evolving science.
The rare 'Einstein zig-zag' gravitational lens system, involving six images of a distant quasar created by two aligned galaxies, offers a unique opportunity to refine measurements of the universe's expansion rate and dark energy, potentially resolving current cosmological tensions and deepening our understanding of the universe's fundamental forces.
Using data from the James Webb Space Telescope, scientists have refined the measurement of the universe's expansion rate, finding it consistent with the standard cosmological model and potentially resolving a long-standing debate about the Hubble constant.
The Big Bang Theory, often misunderstood as an explosive event, actually describes the rapid expansion of the universe from a hot, dense state. It didn't occur at a specific point in space but happened everywhere simultaneously. The theory explains the visible universe's expansion but not the conditions before or the cause of the expansion. Cosmic inflation, a brief period of rapid expansion, is a key part of this narrative. Despite some discrepancies in the expansion rate, known as the Hubble tension, the Big Bang Theory remains a cornerstone of cosmology.
New data from the James Webb Space Telescope confirms previous Hubble Space Telescope measurements of the Universe's expansion rate, suggesting discrepancies with theoretical models may indicate new physics. The study, published in The Astrophysical Journal, supports the accuracy of Hubble's data, ruling out measurement errors and highlighting a tension between observed expansion rates and predictions from the standard LambdaCDM model. Theorists are now exploring explanations such as early dark energy or exotic particles to resolve this "Hubble tension."