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Desi

All articles tagged with #desi

science10 days ago•5 min saved

Tiny Measurement Bias Could Resolve the Dark Energy Tension

A new paper by Slava Turyshev argues that small systematic biases in how we measure supernova brightness and the standard ruler set by baryon acoustic oscillations could explain the DESI DR2–CMB mismatch, potentially removing the case for evolving dark energy. He also advocates the Alcock-Paczynski diagnostic to reduce dependence on early-universe benchmarks and outlines scenarios like the Late-Transition Interacting Thawer (LTIT) and Phantom Crossing as alternative explanations, with upcoming data from Euclid expected to test these ideas.

via ScienceAlert|

#baryon-acoustic-oscillations #cosmology #dark-energy

science11 days ago•16 min saved

Viscous Universe: A Fluid-Damped Expansion Could Redefine Dark Energy

A new preprint suggests empty space behaves like a viscous fluid with bulk viscosity that resists expansion, introducing a time-varying drag on cosmic expansion to address DESI measurements. If future data from galaxy surveys, supernovae, and lensing align with this drag pattern, the idea could challenge the idea of a constant dark-energy driver, potentially replacing it with a dynamic picture—but the proposal remains speculative and requires peer review and broader observational checks.

via Earth.com|

#cosmology #dark-energy #desi

cosmology11 days ago•6 min saved

Dark-energy clues push the universe toward a future Big Crunch

New measurements from the Dark Energy Survey (DES) and DESI suggest the cosmological constant may be negative, causing the universe to keep expanding for about 11 billion more years before contracting to a Big Crunch roughly 20 billion years from now, for an approximate total lifespan of 33 billion years. The scenario relies on evolving dark energy, potentially linked to a very light particle, and is consistent with observations from DES and DESI, with future surveys like Euclid, SPHEREx, and Rubin Observatory planned to test the idea.

via ScienceDaily|

#big-crunch #cosmology #dark-energy

science1 month ago•37 min saved

Could the Universe Be a Sticky Fluid? New Research Hints at Viscous Space

A recent arXiv preprint proposes that space has bulk viscosity, acting like a viscous fluid with spatial phonons creating drag that slows cosmic expansion. This viscous-dark-energy model fits DESI data and could resolve tensions with the standard Lambda-CDM framework, but it remains provisional and will be tested by upcoming observations from missions like Euclid and continued DESI data.

via Yahoo|

#bulk-viscosity #cosmology #dark-energy

physics-and-mathematics1 month ago•54 min saved

Sticky Space? New Idea Says the Vacuum Could Be a Viscous Fluid Shaping the Cosmos

A new arXiv preprint proposes space may have bulk viscosity, effectively making the vacuum a viscous medium with spatial phonons that could slow cosmic expansion and better align DESI observations with reality. If true, this viscous-space model would challenge the standard Lambda-CDM cosmology and the cosmological constant, potentially redefining our understanding of dark energy. However, the idea is unreviewed and data-driven, with questions about whether viscosity is fundamental or a measurement artifact; upcoming data from Euclid and further DESI analyses will be crucial to test this hypothesis.

via Live Science|

#bulk-viscosity #cosmology #dark-energy

science3 months ago•4 min saved

Emerging Evidence Indicates Universe's Expansion Is Slowing, Challenging Dark Energy Theories

New research suggests that the universe's expansion may be slowing down and dark energy might not be accelerating it anymore, potentially marking a major shift in cosmological understanding. This conclusion is based on findings that challenge the standard model of dark energy, indicating the universe has already entered a phase of decelerated expansion, with future observations from the Vera C. Rubin Observatory expected to further test these results.

via Space|

#cosmology #dark-energy #desi

science5 months ago•5 min saved

Rapid and Precise Mapping of the Universe

Scientists have developed Effort.jl, a fast and accurate emulator that mimics complex models of the universe's large-scale structure, enabling faster analysis of cosmic data from surveys like DESI and Euclid without sacrificing precision.

via Phys.org|

#cosmic-web #desi #emulators

science5 months ago•9 min saved

New Evidence Suggests Dark Energy Is Changing and Influencing Cosmic Expansion

New research using DESI suggests dark energy may not be constant over time and could be generated by black holes consuming stellar matter, which also helps resolve the neutrino mass puzzle and offers a new perspective on cosmic expansion.

via SciTechDaily|

#black-holes #cosmology #dark-energy

science6 months ago•6 min saved

Black Holes and Dark Energy: New Insights into Cosmic Evolution

A new hypothesis suggests black holes might convert dead star matter into dark energy, potentially explaining observed variations in the universe's expansion rate and resolving related cosmological puzzles. This idea links the formation of black holes to the emergence of dark energy over cosmic history, supported by recent DESI data indicating changes in dark energy's strength over time.

via Space|

#black-holes #cosmology #dark-energy

science6 months ago•2 min saved

Black Holes and Dark Energy: New Insights and Models

A new study suggests black holes may be the source of dark energy, proposing that dark energy is produced by black holes converting dead star matter, which links the universe's star formation history to its accelerated expansion, potentially resolving previous cosmological tensions.

via Gizmodo|

#black-holes #cosmology #dark-energy

science1 year ago•3 min saved

DESI's Findings Challenge Dark Energy Theories and Cosmic Understanding

Recent research using data from the Dark Energy Spectrometer (DESI) suggests that dark energy may not be a static cosmological constant, but rather exhibits dynamic behavior, supporting the quintom-B model. This study, led by Professor Yi-Fu Cai, utilized baryon acoustic oscillation data to reconstruct the universe's background evolution, revealing that dark energy's equation-of-state parameter changes over time. The findings challenge traditional views and align with modified gravity theories, potentially reshaping our understanding of the universe's accelerated expansion.

via SciTechDaily|

#cosmology #dark-energy #desi

science1 year ago•4 min saved

Einstein's Relativity Reinforced by New Cosmic Discoveries

An international team of scientists has found new evidence supporting Einstein's general theory of relativity through a study of the universe's structure over the past 11 billion years. Using data from the Dark Energy Spectroscopic Instrument (DESI), researchers observed that gravity behaves as predicted by Einstein, even as the universe's expansion accelerates due to dark energy. The findings, which align with the standard model of cosmology, suggest that dark energy might be dynamic, challenging previous assumptions of it being a constant force.

via VOA Learning English|

#cosmic-structure #dark-energy #desi

science1 year ago•7 min saved

Einstein's Gravity Theory Confirmed by New Cosmic Map and Dark Energy Findings

An international team of researchers using the Dark Energy Spectroscopic Instrument (DESI) has confirmed Einstein's General Relativity on a cosmic scale by analyzing the clustering of nearly six million galaxies over 11 billion years. This study provides one of the most rigorous tests of gravity at vast scales, supporting the standard model of gravity and limiting alternative theories. The research also offers new insights into neutrino masses and the universe's structure, with DESI's data setting a ceiling on neutrino mass close to laboratory measurements.

via SciTechDaily|

#cosmology #desi #einstein

science1 year ago•4 min saved

Einstein's Gravity Theory Triumphs in Latest Dark Energy Tests

Einstein's theory of general relativity has passed one of its largest tests yet, as astronomers mapped nearly 6 million galaxies over 11 billion years, confirming the theory's predictions on a cosmic scale. The study, conducted by the Dark Energy Spectroscopic Instrument (DESI) collaboration, supports general relativity's accuracy in describing the Universe's structure and expansion. The findings, which also place constraints on neutrino mass, aim to shed light on dark matter and dark energy, and are available on arXiv.

via ScienceAlert|

#cosmic-web #dark-energy #desi

science1 year ago•3 min saved

Dark Energy Research Confirms Einstein's Gravity Theory Again

An international team of scientists using the Dark Energy Spectroscopic Instrument (DESI) has provided the most precise test of gravity at large scales, confirming that it behaves as predicted by Einstein's theory of general relativity. The study, which analyzed the cosmic structure over the past 11 billion years, suggests that dark energy, responsible for the universe's accelerated expansion, may be dynamic and weakening. This finding could alter the understanding of the universe's future expansion. The research supports the current standard model of cosmology.

via Reuters|

#cosmology #dark-energy #desi