Tag

Dark Energy

All articles tagged with #dark energy

science14 hours ago•9 min saved

String Theory Constructs a Concrete de Sitter Universe with Dark Energy

Bruno Bento and Miguel Montero propose an explicit de Sitter solution in string theory by compactifying extra dimensions on a six-dimensional flat manifold and balancing a Casimir-like effect with flux, producing a small positive dark energy around 10^-15 in Planck units. While a significant step toward matching string theory to our universe and building on Eva Silverstein's ideas, the solution remains five-dimensional and dynamically unstable: the dark energy is expected to weaken over a Hubble time, and researchers still aim to obtain a fully four-dimensional model.

via Quanta Magazine|

#casimir-effect #compactification #dark-energy

science3 days ago•5 min saved

Geometry, not dark energy: a new gravity theory explains cosmic acceleration

Researchers propose an extended gravity theory called Finsler gravity that broadens spacetime geometry; when applied to the Friedmann equations, it naturally yields cosmic acceleration without a dark energy term, suggesting geometry could drive the universe’s speeding expansion.

via ScienceDaily|

#cosmology #dark-energy #finsler-gravity

science6 days ago•15 min saved

Understanding 'Gravitationally Bound' in an Expanding Universe

The article explains what it means for objects to be gravitationally bound in an expanding universe, discussing how structures like stars, galaxies, and clusters are held together by gravity despite the universe's overall expansion, and explores how dark energy influences the future of these structures.

via Big Think|

#cosmic-structures #dark-energy #galaxy-clusters

science6 days ago•3 min saved

Scientists Edge Closer to Unveiling Dark Matter's Secrets

Scientists, including Dr. Rupak Mahapatra, are making progress in understanding dark matter and dark energy, which constitute about 95% of the universe. Using advanced cryogenic detectors like TESSERACT and building on decades of research, they aim to detect elusive particles such as WIMPs, potentially unlocking fundamental secrets of the cosmos and expanding our understanding of physics.

via ScienceDaily|

#cosmology #dark-energy #dark-matter

science8 days ago•2 min saved

Reevaluating Cosmic Expansion: New Theories Challenge Dark Energy's Role

A new study suggests that the accelerated expansion of the universe might be explained by an extension of general relativity called Finsler gravity, potentially eliminating the need for dark energy as the cause.

via SciTechDaily|

#cosmic-expansion #dark-energy #finsler-gravity

science16 days ago•3 min saved

Is the Universe Headed for a 'Big Crunch' as Dark Energy Changes?

A new study suggests that dark energy may be weakening, potentially leading to a reversal of the universe's expansion and a catastrophic collapse into a Big Crunch, challenging long-held scientific beliefs and sparking debate among astrophysicists.

via The Daily Galaxy|

#astrophysics #big-crunch #cosmology

science17 days ago•11 min saved

2025's Most Stunning Space Discoveries and Photos

2025 was a landmark year in astronomy with discoveries including the interstellar comet 3I/ATLAS, evidence of supermassive black hole formation, weakening dark energy, potential signs of past life on Mars and exoplanets, and the first light of the Vera C. Rubin Observatory, promising a new era of cosmic exploration.

via Space|

#biosignatures #black-holes #dark-energy

science18 days ago•5 min saved

Potential Changes in Dark Energy Could Alter the Universe's Future

Recent studies suggest that dark energy, which is driving the universe's expansion, may be weakening, potentially leading to a reversal of expansion and a possible 'Big Crunch' instead of the previously believed continuous acceleration. This challenges current cosmological models and has sparked significant debate among astronomers.

via BBC|

#big-crunch #cosmology #dark-energy

science1 month ago•15 min saved

Standard Model Remains Unsolved as 2025 Closes

As 2025 concludes, the Standard Model of particle physics and cosmology remains robust despite numerous puzzles and challenges, with recent experiments reinforcing its predictions and no definitive evidence yet for physics beyond it. Key mysteries like dark matter, dark energy, and the matter-antimatter asymmetry persist, but current data strongly support the existing framework, emphasizing the need for continued investment in experimental and observational science to uncover deeper truths.

via Big Think|

#cosmology #dark-energy #dark-matter

science1 month ago•4 min saved

NASA's Roman Telescope to Explore Cosmic Voids and Map the Milky Way

NASA's Nancy Grace Roman Space Telescope will map thousands of cosmic voids to better understand the universe's expansion and the nature of dark energy by observing the distribution and shapes of these vast, sparsely populated regions, which can reveal key insights into the universe's composition and evolution.

via NASA (.gov)|

#cosmic-voids #dark-energy #nasa

science1 month ago•16 min saved

Scientists Explore the Universe's Possible Endings

The article explores how potential new physics beyond the Standard Model, such as self-interacting dark matter, unstable protons, or evolving dark energy, could dramatically alter the long-term fate of the universe, challenging current predictions of heat death and cosmic expansion.

via Big Think|

#cosmology #dark-energy #dark-matter

science1 month ago•10 min saved

Top 9 Gaps in Our Knowledge of Cosmic History

The article discusses nine major unresolved questions in our understanding of cosmic history, including the origins of cosmic inflation, the nature of dark matter and dark energy, the formation of the first stars, and the ultimate fate of the universe, highlighting the ongoing mysteries and the limits of current scientific knowledge.

via Big Think|

#cosmic-history #cosmic-inflation #dark-energy

science1 month ago•5 min saved

Theories on the Universe's Final Fate

The universe, originating from the Big Bang about 14 billion years ago, is expected to continue expanding, with star formation ceasing and galaxies merging into larger elliptical galaxies over trillions of years. Ultimately, the universe may fade into darkness, driven by dark energy, but its exact future remains uncertain and open to new discoveries.

via Space|

#big-bang #cosmology #dark-energy

science2 months ago•6 min saved

New Research Suggests the Universe's Expansion Is Slowing, Indicating a Paradigm Shift

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.

via Earth.com|

#cosmology #dark-energy #expansion-rate

science2 months ago•26 min saved

Universe's Expansion Is Now Slowing Down

A recent study suggests that the universe's expansion is slowing down rather than accelerating, challenging the standard cosmological model and implying potential new physics or models like a cyclic universe. The findings focus on the impact of progenitor star age on Type Ia supernova luminosity, which could bias previous measurements of cosmic expansion. While intriguing, the results are met with cautious skepticism and require further validation with upcoming data.

via Hacker News|

#big-bounce #cosmology #dark-energy