This issue actually has nothing to do with quantum effects; it's just the way Special Relativity is interpreted. Some people like to think of the speed of light as a conversion factor between space and time. For instance, they would say that there is no difference between 1 year and 1 light-year. They do this because of the identity ds^2=dx^2+dy^2+dz^2-(cdt)^2. Note that the last quantity that gets squared is not dt, but cdt. So you can think of time as a fourth dimension w=ct. The authors who think along these lines often make the claim that everything in the universe is moving in the time direction with a constant speed c (although that's strange, because speed is distance over time).exponent137 said:In QED calculations are made with variable c.
But Duff says that c does not exists, because it is only a transformation factor. So if we put c=1 how QED is changed at small distances?
The variable speed of light in QED (Quantum Electrodynamics) is a concept that suggests that the speed of light may change depending on the medium it travels through. This theory is based on the idea that the vacuum of space is not completely empty and can affect the propagation of light.
The variable speed of light theory is a fundamental part of QED, which is a quantum field theory that describes the interactions between light and matter. This theory is based on the idea that light is made up of particles called photons, and these particles can interact with other particles in the vacuum, causing the speed of light to vary.
There is currently no direct evidence to support the variable speed of light theory. However, some experiments have shown that the speed of light can vary when traveling through certain materials, such as water or glass. Additionally, the theory is supported by mathematical calculations and is consistent with other theories in physics.
If the variable speed of light theory is proven to be true, it could have a significant impact on our understanding of the fundamental laws of physics. It could also have practical applications, such as improving our understanding of how light travels through different materials and potentially leading to advancements in technology.
The variable speed of light theory is still a topic of debate and is not widely accepted by the scientific community. It is considered to be a controversial idea, and more research and evidence are needed to fully understand its implications and validity. However, it remains an intriguing concept that continues to be studied and explored by scientists.