| From: FJB | 7/22/2024 6:20:14 PM | | | | | | Planck stars, White Holes, Remnants and Planck-mass quasi-particles. The quantum gravity phase in black holes' evolution and its manifestations
Carlo Rovelli, Francesca Vidotto
This is a review of some recent developments on quantum gravity aspects of black hole physics. In particular, we focus on a scenario leading to the prediction of the existence of a Planck-mass quasi-stable object, that could form a component of dark matter.
| Comments: | | Subjects: | General Relativity and Quantum Cosmology (gr-qc); Cosmology and Nongalactic Astrophysics (astro-ph.CO) | | Cite as: | arXiv:2407.09584 [gr-qc] | | | (or arXiv:2407.09584v2 [gr-qc] for this version) | | | doi.org
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| From: FJB | 10/11/2024 9:18:47 PM | | | | | | GIANT CHOPSTICK CATCH MAYBE SOON...
We will try to catch it upon return to launch site using the Mechazilla arms like giant chopsticks (like Karate Kid)!
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| From: FJB | 11/16/2024 4:37:27 PM | | | | | | James Webb Space Telescope Finds Stunning Evidence for Alternate Theory of Gravity
Astronomers using the James Webb Space Telescope to peer back in time into the farthest reaches of the universe have found stunning evidence for an alternate theory of gravity.
Current models of galaxy formation in the early cosmos predict the presence of excess gravity caused by dark matter to pull material into slowly forming galaxies. However, an alternate theory of gravity first proposed in 1998 called Modified Newtonian Dynamics (MOND) suggests that structures in the early universe formed very quickly without the need for theoretical dark matter.
Now, researchers from Case Western Reserve University say that scans of ancient galaxies gathered by the JWST seem to contradict the commonly accepted predictions of the most widely accepted Cold Dark Matter theory, Lambda-CDM. Instead, the readings seem to support a basis for MOND, which would force astronomers and cosmologists to reconsider this alternative and long-controversial theory of gravity.
https://thedebrief.org/james-webb-space-telescope-finds-stunning-evidence-for-alternate-theory-of-gravity/ |
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| To: FJB who wrote (3019) | 11/16/2024 4:43:39 PM | | From: FJB | | | | MOND: A Radical Alternative Theory of Gravity
The MOND theory, first proposed in 1983 by Israeli physicist Mordehai Milgrom, offers a different explanation. MOND suggests modifying Newton’s second law to account for discrepancies observed in galaxy rotation curves without invoking dark matter. These modifications are relevant in regions of tiny accelerations, such as those experienced at the universe’s periphery, where JWST is now observing.
In 1998, McGaugh co-authored a seminal paper proposing that galaxy formation happened more rapidly and did not rely on dark matter. Instead, he and his co-authors, including Federico Lelli, Jay Franck, and James Schombert, theorized that galactic material was quickly collected, expanded with the universe, and then collapsed under gravity. This theory contends that galaxies came together early, forming large, luminous structures without the need for dark matter. |
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