Gravity and other fundamental forces

[rajeshmarndi]

What is it about gravity that is not yet understood unlike other fundamental forces.

Isn't gravity just another force like the other three fundamental forces.

 

[sadaf2605]

If i am not wrong thn Gravitational Force is the only force that does not cause repulsion...

 

[IsometricPion]

Gravity is well understood in the contexts in which it has been measured so far, and is described using http://en.wikipedia.org/wiki/Introduction_to_general_relativity" . The difference between how gravity is understood and how the other three fundamental forces are understood is that unlike the other forces gravity does not have an experimentally supported quantum description.

General relativity says that the rest mass-energy of a system produces gravity, and that http://en.wikipedia.org/wiki/Black_hole_thermodynamics" constantly come into existence and then cease to exist over arbitrarily short time scales, so extremely small black holes would always be forming, but this would violate energy conservation since the black holes could not cease to exist as required by quantum mechanics. Thus, naively combining quantum mechanics and general relativity leads to contradictions. Since gravity is much weaker than the other forces in the situations in which its effects have been measurable there has been no way, so far, to determine what actually happens over the small length and/or short time scales at which corrections to general relativity (or quantum mechanics) become important.

 

[HallsofIvy]

I'm wondering why you think that the "other fundamental forces" are well understood! We know no better what causes electromagnetic force than we do what causes gravity.

 

[pmacias]

Gravity is indeed considered one of the four fundamental forces in nature, along with electromagnetism, strong nuclear force, and weak nuclear force. However, it is still not fully understood in the same way that the other three forces are.

One key difference is that gravity is the only force that has not yet been successfully unified with the other three forces in a single theory. The other three forces have been unified in the Standard Model of particle physics, but gravity remains a mystery in this regard.

Additionally, the other three forces have well-established mathematical frameworks and equations that accurately describe their behavior and interactions. However, gravity is described by Einstein's theory of general relativity, which has not yet been reconciled with the principles of quantum mechanics. This creates a discrepancy in our understanding of how gravity works on a microscopic level.

Furthermore, gravity is the weakest of the four fundamental forces, making it more difficult to observe and study in detail. This adds to the challenges in fully understanding its nature and behavior.

In conclusion, while gravity is a fundamental force, it still presents many unanswered questions and challenges for scientists. Further research and exploration are needed to fully understand this force and its role in the universe.