Why there's No Unified Theory ?

In summary, we believe that as we increase in scales of energy, we may see gravity merge with the other forces. However, we don't know for sure yet.
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Arman777
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What's the main reason that we cannot unify QED and Gravity or with other foces ?
 
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@Arman777 , our current unified fiel theory comprises electromagnetism, the week nuclear force and the strong nuclear force. The problem of gravity is, first...its order of strength is much smaller than the other ones. That means that, on atomic and subatomic scales (where the other forces may compete, interact and compose), gravity seems to have no part due to the small masses involved. Einstein theorized that gravity could be the reason why the different "repelling parts" of an electron are held together, but that electrons even have parts, we haven't be able to demonstrate. At the same time, the best description of gravity doesn't use quantum methods, where we suppose the natural forces as virtual particles and whose interaction can be worked out by Feynman diagrams. Gravity is described by differential geometry, and effects on the topology of space time. So, it's both the incompatibility in scales of action and in methods of explanation. We do believe that, as we increase on the scales of energy, we may see gravity merge with the other forces. There are some theories who try to make that to work out, like string theory or quantum loops. But so far, nothing could be definitely proved.
 
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Arman777 said:
What's the main reason that we cannot unify QED and Gravity or with other foces ?
Because no one has been smart enough to be able to do it yet.
 
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jtbell said:
Because no one has been smart enough to be able to do it yet.
Thats an another point of view.

Maybe we need to learn more so we can unify them

Interestingly, the idea of constant speed of light is the basis of SR and hence GR while light is about electromagnetism so it seems awkward..In Newtonian view we can't talk about the speed of light but only masses and forces and etc.as Luka said..I remember a diagram that we need a lot of GeV to unify them or it was something like.

Here it's
smbrk.gif


How is energy related to unifying them ?

As in the beginning of the universe like ##10^-39## second or less there was only energy and nothing else and the universe was really small..Its really hard to believe that a theory will explain how matter behaves in that era.
 

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1. Why is there no unified theory in science?

The concept of a unified theory is a long-standing goal in science, but it has proved to be a difficult task to achieve. The main reason for this is that different fields of science have their own theories and principles, and it is challenging to find a single theory that can explain all phenomena.

2. What is the current status of the search for a unified theory?

The search for a unified theory is still ongoing, and many scientists are actively working towards this goal. However, there is no consensus on what this theory should look like or how it should be achieved. Some believe that it may not be possible to find a single theory that can explain everything, while others continue to explore new ideas and theories.

3. How would a unified theory benefit science?

If a unified theory could be found, it would provide a deeper understanding of the fundamental principles of the universe and how different phenomena are connected. It would also help to bridge the gap between different fields of science and potentially lead to new discoveries and advancements in technology.

4. What are some challenges in developing a unified theory?

One of the biggest challenges in developing a unified theory is the vastness and complexity of the universe. Scientists must consider a wide range of phenomena, from the very small scale of subatomic particles to the vastness of the cosmos. Additionally, there are also conflicting theories and principles that need to be reconciled, making the task even more challenging.

5. Are there any promising theories or approaches towards a unified theory?

There are several promising theories and approaches towards a unified theory, such as string theory, loop quantum gravity, and grand unification theory. These theories attempt to explain the fundamental forces and particles of the universe and how they are all connected. However, none of these theories have been conclusively proven, and the search for a unified theory continues.

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