Articles tagged with Dark Energy
Researchers at the University of Southern Denmark propose a new model for dark matter, suggesting a heavier particle that interacts only through gravity. This PIDM particle could have been created in the early universe under extremely hot conditions, and its existence can be tested using planned gravitational wave experiments.
The Nearby Supernova Factory has developed a new method to measure cosmological distances using 'supernova twins,' which are pairs of supernovae with closely matched spectra. This approach reduces the scatter in brightness dispersion to just 8%, allowing for more accurate measurements and a stronger test of dark energy theory.
The DESI Collaboration, led by the U.S. Department of Energy, has achieved a major milestone in its dark energy research project. Using the Dark Energy Spectroscopic Instrument, DESI will measure the redshifts of over 30 million galaxies and quasars with unprecedented precision.
A UCLA physicist tested dark energy theories by mimicking the vacuum of space using cold atoms. The study found no difference in the acceleration of cesium atoms when changing the location of a dense object, providing insight into how chameleon fields interact with normal matter.
Researchers from the XENON Collaboration report on a search for dark matter using an underground detector in Italy. The results set limits on several types of dark matter candidates and provide new insights into the nature of dark energy.
Researchers at UC Berkeley conducted an experiment to detect dark energy particles called 'chameleons,' which were proposed as a possible explanation for the mysterious energy. The results narrowed the search by a thousand times compared to previous tests, ruling out certain energies and eliminating a large range of possible particles.
Scientists using Dark Energy Survey find eight faint celestial objects orbiting Milky Way, which could indicate more galaxies hiding nearby. These discoveries suggest our cosmic neighborhood is more densely populated than previously thought, with implications for understanding dark matter and galaxy formation.
A new mathematical formulation of cosmic viscosity bridges the gap between thermodynamics and Einstein's general theory of relativity, favoring the 'Big Rip' scenario. The model also sheds light on dark energy, suggesting it may account for the universe's accelerating expansion.
The Large Synoptic Survey Telescope (LSST) will survey the entire Southern Hemisphere's sky, collecting 30 terabytes of data nightly. The telescope aims to map 20 billion galaxies and observe supernovae, offering stringent tests on dark matter and dark energy.
Astronomers captured the early stages of three type 1a supernovae using the Kepler space telescope, revealing initial shockwaves differed from expected patterns. The findings suggest an alternative hypothesis for supernova ignition, contradicting long-held theories about these explosive events.
The Dark Energy Survey has released a series of detailed maps of dark matter, created with the world's most powerful digital camera. The analysis will help scientists understand dark matter's role in galaxy formation and probe the nature of mysterious dark energy.
Researchers have found two groups of type Ia supernovae with different properties, hinting at a reevaluation of the universe's expansion rate and dark energy. The discovery uses combined observations from the Hubble Space Telescope and Swift satellite.
Nexus theory reconciles GR and Quantum Theory, explaining dark matter as the nexus graviton's constant rotational motion. The theory also sheds light on perplexing questions in physics, including a quantum description of Black Holes without singularities.
A team of astronomers from University of Cambridge identified nine new dwarf satellites orbiting Milky Way, largest number ever discovered. The findings may help unravel mysteries behind dark matter, invisible substance holding galaxies together.
Researchers have found a set of celestial objects that resemble dwarf satellite galaxies orbiting the Milky Way. These discoveries could provide insights into dark matter and its role in galaxy formation.
The Nexus theory provides a self-consistent explanation for Quantum Gravity, reconciling GR with Quantum Theory. It introduces the Nexus graviton, a composite particle that induces constant rotational motion and constitutes space-time.
Astronomers have observed a distant star exploding four times due to a massive galaxy cluster, providing a rare opportunity to test Albert Einstein's General Theory of Relativity. The discovery also offers clues about the strength of gravity, dark matter, and dark energy in the universe.
Researchers suggest using shallow detectors on Earth's surface or in areas with low energy loss to detect dark matter signals. This approach aims to reduce background noise from cosmic radiation and increase the chances of detecting dark matter particles.
The POLARBEAR experiment uses microwave detectors to measure B-mode polarization, allowing researchers to map the large-scale structure of the universe. The team also aims to determine neutrino masses and study dark matter and dark energy.
The Dark Energy Survey has begun its second year, mapping the southern sky in unprecedented detail to unravel the mystery of dark energy. The survey's five-year mission will provide breathtaking pictures of the cosmos.
Researchers are using rare cosmic explosions called supernovae to measure dark energy, aiming to gain insights into its composition and impact on the universe. By studying these events, scientists hope to refine their understanding of this enigmatic force and its role in shaping the cosmos.
Using spatial scanning, astronomers can now measure the distance of stars up to 10,000 light-years away with enhanced accuracy. This new technique is expected to provide insight into dark energy and refine estimates of the universe's expansion rate.
Researchers propose that dark energy is a dynamic quantum vacuum energy, not quintessence or phantom fields, explaining accelerated cosmic expansion. This explanation resolves the cosmological constant discrepancy and simplifies the problem compared to quintessence and phantom fields.
Researchers from the Baryon Oscillation Spectroscopic Survey (BOSS) have measured galaxy distances over six billion light-years away to an unprecedented one-percent accuracy. This achievement places new constraints on dark energy and provides valuable insights into the mysterious force driving the universe's accelerating expansion.
The Baryon Oscillation Spectroscopic Survey (BOSS) has made the most precise calibration yet of the universe's 'standard ruler', measuring its scale to an accuracy of one percent. This precision is crucial for determining the nature of dark energy and understanding the expansion history of the universe.
A new study by Dartmouth researchers eliminates a controversial theory that the universe's accelerating expansion is an illusion. They used Big Bang afterglow to show that Earth has no special place in the expanding universe, eliminating the possibility of a cosmic center.
Researchers suggest the Higgs boson could help resolve the cosmological constant problem by introducing another background field that contributes an energy density matching the observed dark energy. This advance provides new insights into understanding dark energy's mysterious nature.
A new analysis of cosmic microwave background radiation data has taken the furthest look back in time, revealing an excess of radiation that may indicate the presence of primordial neutrinos or dark energy. The findings challenge current theories on the universe's early expansion history.
The U.S. Planck Team, led by NASA and DOE, generates a massive simulation suite using NERSC's resources to analyze the flood of data from the Planck mission. This allows for precise cosmology results, with 250,000 maps of the sky produced in just 1,000 realizations.
The European Space Agency has selected NASA's Goddard team to join the Euclid mission, a space telescope designed to probe the mysteries of dark energy and dark matter. The project aims to explore the cosmic infrared background and provide insight into stellar and galactic populations in the early universe.
Irene Sendra's research proposes a dynamic, dark energy model that varies over time, consistent with observations of the universe's acceleration. She also unites dark energy and dark matter into a single component, achieving better results in her models.
Research by Rodger Thompson finds that a popular dark energy alternative does not fit newly obtained data on the proton to electron mass ratio. This impact our understanding of the universe's accelerating expansion and point to a new direction for further study, potentially leading to a return to Einstein's General Relativity.
The Gordon and Betty Moore Foundation has awarded a $2.1 million grant to the University of California at Berkeley's Berkeley Center for Cosmological Physics to advance dark energy research through the BigBOSS project. BigBOSS aims to study dark energy with unprecedented precision using revolutionary technologies.
A type of exploding star that fails to detonate, known as a failed explosion, is probably the cause of most peculiar supernovae. These dim stars are anywhere from 10-100 times fainter than normal ones and may account for approximately 15% of all type Ia supernovae.
The BOSS survey maps quasars to study dark energy, revealing a new era of the universe's expansion history. By analyzing the Lyman-alpha forest, scientists can measure BAO and calibrate the rate of expansion.
DECam, the most powerful sky survey instrument built, relies on Berkeley Lab's red-sensitive astronomical CCDs for exceptional sensitivity and resolution. This collaboration has enabled scientists to collect images of distant galaxies and measure the expansion history of the universe with unprecedented precision.
The Dark Energy Camera, the most powerful sky-mapping machine ever created, has captured and recorded its first images in Chile. The camera will use data from the largest galaxy survey to study galaxy clusters, supernovae, and dark energy.
Researchers explore dark energy's impact on the Universe's fate, citing a 'big rip' scenario as a possibility with predicted timelines for object destruction. The study uses the Ma-Zhang parameterization to forecast the evolution of the Universe.
The Euclid mission, a collaboration of nearly a thousand scientists, aims to study the distribution and evolution of dark matter and dark energy using state-of-the-art instruments. The UK Space Agency has funded £8.5M for the development of scientific instruments and the Science Ground Segment.
The South Pole Telescope's data analysis provides strong support for the cosmological constant as the source of dark energy, accelerating the universe's expansion. The results also place tight limits on neutrino masses, shedding light on these mysterious particles' properties.
The Baryon Oscillation Spectroscopic Survey (BOSS) has made precision measurements of the large-scale structure of the universe five to seven billion years ago. By using a technique called baryon acoustic oscillation, BOSS can determine the distances to faraway galaxies with unprecedented accuracy.
The Kavli Institute aims to crack the puzzles of cosmological theory, including dark energy's repulsive gravity, dark matter's composition, and cosmic inflation's rapid expansion. New simulations and detectors will help scientists uncover new physics beyond current theories.
Researchers have used a three-dimensional color map of the universe to create the most accurate calculation yet of how matter clumps together. By analyzing the brightness of 900,000 galaxies, they found that dark energy accounts for 73% of the universe's density, providing new insights into the cosmos.
Scientists at Fermilab and Berkeley Lab have created the largest direct measurements of dark matter yet, using new methods that will improve ground-based surveys. The maps show a clearer picture of the universe's past, which is crucial for understanding dark energy.
Saul Perlmutter, along with Brian Schmidt and Adam Riess, discovered the accelerating expansion of the universe through distant supernovae observations. This discovery implies the existence of dark energy, a mysterious force opposing gravity and increasing galaxy distances.
Saul Perlmutter, a physicist at Lawrence Berkeley National Laboratory, won the 2011 Nobel Prize in Physics with colleagues Brian Schmidt and Adam Riess. Their groundbreaking work discovered the accelerating expansion of the universe through observations of distant supernovae.
Researchers leverage supercomputers to investigate dark energy, a mysterious force driving the universe's expansion. They develop new models that allow for more accurate analysis of subtle dark matter clustering features, such as Baryon Acoustic Oscillations (BAO), crucial for constraining cosmological parameters.
Astrophysicists are using Type Ia supernovae, also known as 'zombie' stars, to build a map of the universe's history and understand dark energy. The stars' explosive deaths can be used to measure distances in the universe.
The Baryon Oscillation Spectroscopic Survey (BOSS) has created the biggest 3-D map of the distant universe, using light from 14,000 quasars. The map demonstrates that it is possible to determine variations in the density of intergalactic hydrogen gas at cosmological distances and measure the effects of dark energy.
Astronomers using NASA's Hubble Space Telescope have recalculated the universe's expansion rate with unprecedented accuracy, ruling out an alternate theory on dark energy. The new measurement reduces uncertainty by 30% and solidifies understanding of cosmic ingredients.
Scientists have extended a directly-measured 'yardstick' three times farther into the cosmos using the super-sharp radio vision of the VLBA. New measurements have placed a galaxy at 450 million light-years from Earth, with implications for understanding Dark Energy and the expansion rate of the Universe.
The BigBOSS Collaboration will use 500 nights of observing time on the Mayall Telescope to create a massive galaxy-redshift map, reaching back 10 billion years to investigate dark energy. The instrument will enable precise measurements of thousands of astronomical objects, providing unprecedented opportunities for scientific research.
A new study led by Ryan Foley has found a way to correct for small variations in the appearance of Type Ia supernovae, making them better standard candles. This discovery allows cosmologists to improve their data analysis and make more accurate measurements of dark energy.
Nine dark energy models have been tested and compared using the latest observational data, including type Ia supernovae, baryon acoustic oscillation, and cosmic microwave background. The cosmological constant (CC) model is found to be the best fit, with five other models providing a good fit to the current data.
Scientists have found the largest known galaxy cluster at a staggering 7 billion light-years away, holding hundreds of galaxies. This discovery provides crucial insights into dark energy's influence on cosmic structure growth.
Using gravitational lensing, researchers probe elusive dark energy for the first time, improving current measurements of mass and energy content. The results narrow the range of estimates about dark energy's effect on the universe by 30 percent.
Researchers use gravitational lensing in galaxy cluster Abell 1689 to study the properties of dark energy. The distortion induced by lensing allows them to reconstruct light paths and understand its effect on space geometry.
Radio astronomers have developed a new technique for studying dark energy by mapping large-scale cosmic structures. This method, called intensity mapping, allows them to accumulate radio waves emitted by hydrogen gas in vast volumes of space, revealing insights into the nature of dark energy and its impact on the Universe's evolution.
New results from a galaxy survey set the smallest upper limit on the size of the elusive neutrino particle to date at 0.28 electron volts. The research uses a large 3D map of galaxies and cosmic microwave background radiation, providing insights into dark matter.
Vanderbilt University astronomers participate in the Baryon Oscillation Spectroscopic Survey (BOSS) to measure the distance of galaxies and quasars. The team uses 400 simulated universes to test data analysis methods and interpret BOSS's measurements of dark energy.