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Speaking of the theory of gravity - new study suggests that gravity can exist without mass


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https://phys.org/news/2024-06-gravity-mass-mitigating-hypothetical-dark.html

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Dark matter is a hypothetical form of matter that is implied by gravitational effects that can't be explained by general relativity unless more matter is present in the universe than can be seen. It remains virtually as mysterious as it was nearly a century ago when first suggested by Dutch astronomer Jan Oort in 1932 to explain the so-called "missing mass" necessary for things like galaxies to clump together.

Now Dr. Richard Lieu at The University of Alabama in Huntsville (UAH) has published a paper in the Monthly Notices of the Royal Astronomical Society that shows, for the first time, how gravity can exist without mass, providing an alternative theory that could potentially mitigate the need for dark matter.

"My own inspiration came from my pursuit for another solution to the gravitational field equations of general relativity—the simplified version of which, applicable to the conditions of galaxies and clusters of galaxies, is known as the Poisson equation—which gives a finite gravitation force in the absence of any detectable mass," says Lieu, a distinguished professor of physics and astronomy at UAH, a part of the University of Alabama System.

"This initiative is in turn driven by my frustration with the status quo, namely the notion of dark matter's existence despite the lack of any direct evidence for a whole century."

 

 

https://academic.oup.com/mnras/article/531/1/1630/7673084?login=false

 

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On 6/18/2024 at 5:25 PM, diga said:

Ahh.. the eternal search for universal constant

 

Never going to happen. If you read about Godel's incompleteness theorem, all math involves axioms. 

 

 

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3 hours ago, MechEng said:

 

Never going to happen. If you read about Godel's incompleteness theorem, all math involves axioms. 

 

 

P != NP .. 

 

Fallacies are dreams for some Math/Physicists 

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On 6/18/2024 at 5:12 PM, coffee_rules said:

Isn’t that what black holes suggest? 

Black holes have mass...condensed into an incredibly small size and high density though.

Saw on episode of Kurzgesazt - in a nutshell on youtube. They conveyed the same.

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3 hours ago, Tillu said:

So will this make inter galactic travel possible without floating in space due to zero gravity.

 

UFO flight dynamics defies common physics. Firstly, they are not aerodynamically designed, and they reach at speeds that no man made aircraft can catch them (been confirmed by US airforce).

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Dark matter from my understanding is basically a mathematical construct to allow for the unexplained amount light bends to galaxies/cluster, or how fast stuff(stars/planetary structures) in Galaxies/cluster converge much more than their existing masses should allow for. It has never been truly 'observed' though.

 

It seems the above paper doesn't truly make gravity 'Massless' as such, just gives new mathematical solutions to make up the sum attributed to Dark Matter. But it again seems only theoretically, nothing truly observational as such

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4 hours ago, Tillu said:

So will this make inter galactic travel possible without floating in space due to zero gravity.

Only something like a Warp-Drive can make inter galactic travel possible.

 

Inter Galactic travel is only possible at speeds closer to light, Voyager 1, which has been farthest any manmade object has made, roughly travels at 60k km/h.

A quick google check, The next closest galaxy is a couple of million light years away. For someone on earth its obviously doesnt make sense even but the one travelling at those speeds(near or more than speed of light) experiencing time dilation it seems possible. 

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Did not read the paper but it seems like another alternate theory of gravity to remove the need of Dark Matter. All good and well, but need observational or experimental evidence to really say or refute anything.

 

One of the post docs in my research group who works partially with Dark Matter says that if you don’t understand something; blame it on Dark Matter. We have some strong indirect evidence for dark matter from Gravitational lensing (See MACHO objects). There are lots of models as well for Dark Matter and some models explain some observations well, but not all. Interesting stuff and could potentially lead to a nobel prize or nothing. 

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