Tag

Modified Newtonian Dynamics

All articles tagged with #modified newtonian dynamics

science1 month ago•33 min saved

Ultra-Low-Acceleration Gravity: New Study Sparks MOND Possibilities

A Gaia-based study of 26,500 wide binary stars within 650 light-years finds that at ultra-low accelerations (~0.1 nm/s^2) observed accelerations exceed Newton-Einstein predictions by about 30–40%, while at higher accelerations (~10 nm/s^2) the data align with standard gravity. The results could be explained by Modified Newtonian Dynamics (MOND) and the AQUAL formulation, offering potential evidence for gravity behavior beyond the classical model, though MOND remains a theory and further observations are needed amid ongoing dark-matter explanations.

via Yahoo News Canada|

#aqual #gravity #modified-newtonian-dynamics

science1 year ago•4 min saved

JWST Challenges Conventional Galaxy Formation Theories with New Findings

The James Webb Space Telescope has provided evidence that challenges the widely accepted Lambda-CDM model of galaxy formation, which relies on dark matter. Instead, observations suggest support for the Modified Newtonian Dynamics (MOND) theory, which posits that galaxies formed rapidly without dark matter. This finding, led by researchers from Case Western Reserve University, could prompt a reevaluation of current gravitational theories, though MOND remains controversial due to its inconsistency with Einstein's General Relativity.

via The Debrief|

#dark-matter #galaxy-formation #gravity

science1 year ago•4 min saved

James Webb Telescope Sparks Rethink of Dark Matter and Galaxy Formation Theories

New data from the James Webb Space Telescope challenges the traditional dark matter model of galaxy formation, suggesting that galaxies in the early universe formed more rapidly than expected. This supports the Modified Newtonian Dynamics (MOND) theory, which proposes an alternative gravitational model that does not rely on dark matter. The findings, published in The Astrophysical Journal, highlight MOND's predictive success but also acknowledge the challenges of integrating it with established cosmological theories like general relativity.

via The Daily Galaxy --Great Discoveries Channel|

#cosmology #dark-matter #galaxy-formation

astronomy2 years ago•2 min saved

"Unveiling Gravity's Secrets: Wide Binary Stars Challenge Laws of Physics"

Astrophysicist Kyu-Hyun Chae has detected gravitational anomalies in widely separated twin stars, suggesting a breakdown of standard gravity at low accelerations. Analyzing nearly 2,500 wide binary star systems observed by the Gaia space telescope, Chae found that closely orbiting twin stars behaved consistently with classical Newtonian dynamics, but those separated by more than 2,000 astronomical units exhibited a velocity boost inconsistent with classical mechanics. Chae's findings challenge the dark matter paradigm and standard cosmology based on general relativity, but further independent studies are needed to confirm the claimed anomaly and its implications for astrophysics, cosmology, and fundamental physics.

via ScienceAlert|

#astronomy #astrophysics #general-relativity

science2 years ago•1 min saved

Is our galaxy trapped in an empty void?

Scientists from Germany, Scotland, and the Czech Republic propose that our galaxy may be situated in a region of space with relatively little matter, resembling an "air bubble in a cake." This hypothesis arises from discrepancies in the Hubble-Lemaitre constant, which measures the distance and speed at which galaxies move away from each other. The researchers suggest that a local "under-density" or void in the universe could explain these deviations, challenging the standard model of cosmology. They propose a modified theory of gravity called "modified Newtonian dynamics" (MOND) to account for the existence of such bubbles. If true, this theory would resolve the Hubble tension and potentially reshape our understanding of the universe's expansion.

via indy100|

#expansion-of-the-universe #galaxy #hubble-lemaitre-constant

astronomy2 years ago•2 min saved

Unraveling the Universe's Expansion: The Giant Void Hypothesis

Recent observations suggest that our galaxy may exist in a void, an expansive region with significantly less matter. This finding challenges the Hubble-Lemaitre constant and demands a reevaluation of the standard model of the universe. The theory supports the concept of modified Newtonian dynamics proposed by physicist Mordehai Milgrom. Further research is needed to validate this hypothesis and resolve the Hubble tension, a discrepancy in the measurement of the Hubble constant. Alternative theories of gravity and the reluctance to overhaul the Lambda-CDM model are also discussed.

via Giant Freakin Robot|

#astronomy #galaxy #hubble-lemaitre-constant

science-and-astronomy2 years ago•7 min saved

Unraveling the Universe's Expansion: The Enigma of the Supervoid

Scientists propose that the discrepancy in measurements of the universe's expansion rate, known as the Hubble Tension, could be explained if our galaxy, the Milky Way, is situated in a two-billion-light-year-wide void called the Keenan-Barger-Cowie supervoid. This hypothesis challenges the standard model of cosmology and suggests that a modified theory of gravity, called Modified Newtonian Dynamics (MOND), could replace the need for dark matter. However, this idea is highly debated among astronomers, and alternative methods of measuring the expansion rate also contradict the hypothesis.

via Space.com|

#hubble-tension #keenan-barger-cowie-supervoid #modified-newtonian-dynamics

astronomy2 years ago•2 min saved

Unraveling the Mystery of the Universe's Expansion: The Giant Void Solution

Researchers from the University of Bonn and St Andrews propose a new theory to explain the "Hubble tension" - the discrepancy between the observed and predicted rate of the universe's expansion. They suggest that our solar system is located in a region with a lower density of matter, creating a void where galaxies move away from each other faster than expected. This finding challenges the current standard model and supports the idea of modified Newtonian dynamics, which could resolve the Hubble tension. Further scientific scrutiny is needed to validate this theory.

via Futurism|

#astronomy #hubble-tension #matter-density

astronomy2 years ago•2 min saved

Unveiling the Enigma: Exploring Modified Gravity and the Hunt for Planet Nine

The hunt for a ninth planet in our solar system may instead be revealing evidence of a modified law of gravity known as Modified Newtonian Dynamics (MOND), according to theoretical physicists Harsh Mathur and Katherine Brown. MOND proposes that Newton's law of gravity is valid up to a certain point, after which a different gravitational behavior takes over. The researchers found that MOND predicts the observed clustering of objects in the outer solar system, which had initially motivated the search for a ninth planet. While the current dataset is small and other possibilities remain, this study highlights the potential for the outer solar system to test gravity and study fundamental physics problems.

via SciTechDaily|

#astronomy #gravity #modified-newtonian-dynamics

science2 years ago•1 min saved

Unveiling the Enigmatic Truth Behind the Elusive Ninth Planet

Scientists have proposed that the unexplained movements of objects at the edge of our solar system, previously attributed to a hidden "Planet Nine," could actually be the result of a modified law of gravity known as Modified Newtonian Dynamics (MOND). Researchers plotted the movements of these objects using MOND and found that the data aligned with the theory, suggesting that Newton's gravity may behave differently in the outer regions of galaxies. However, the study does not rule out the existence of Planet Nine or other explanations for the observed phenomena. The findings highlight the potential for the outer solar system to serve as a laboratory for testing gravity and studying fundamental problems of physics.

via The Independent|

#astronomy #gravity #modified-newtonian-dynamics

science2 years ago•3 min saved

"The Resilience of Einstein and Newton's Gravity Theories: Debunking Exaggerated Reports"

Recent papers have claimed to challenge the theories of gravity proposed by Einstein and Newton, suggesting that dark matter may not exist and that our laws of gravity need modification. The existence of dark matter is favored due to its predictive power and ability to explain various features of the universe. However, the recent papers testing Newtonian acceleration in binary star systems have yielded conflicting results, making it difficult to draw definitive conclusions. Further studies and more precise observations are needed to determine the validity of these claims.

via IFLScience|

#binary-stars #dark-matter #general-relativity