In a peer-reviewed publication, one of the length-contraction effects of a physical object, depicted in the diagram, is used to derive conclusions. It has been referenced by other authors and in Wikipedia. The paper is not identified here intentionally, hopefully, to avoid bias in possible explan...

I'm learning quantum field theory from P&S and Srednicki. I'm having a lot of difficulties understanding the concept of a momentum state. In particular, I'm confused about how to interpret the integration over momentum space that one frequently encounters as opposed to the discrete sum and occupa...

Let us imagine you are in a vacuum and after having maintained a speed of 0 km/s (standing still) you accelerate to 297,000 km/s (99%). You know this is now your speed because you have a speedometer telling you so. You then decide to maintain that speed for a while. With the speed of light is alw...

Is there a reason i cant find anywhere the lorentz transformations for polar coordinates? I can only find the lorentz transformations for cartesian coordinates. Can anyone guide me on how to transform polar coordinates, or is the only way to convert them to cartesian coordinates first and then tr...

I was reading this article that said Imagine that all of space is uniformly filled with an invisible substance—now called the Higgs field—that exerts a drag force on particles when they accelerate through it. Push on a fundamental particle in an effort to increase its speed and, according to Hig...

I read an idea in mathematics about periodic functions that a constant function is also a periodic function with an undefinable period. So , suppose a body is at rest (for an observer). This means that it's position doesn't change with time for that observer. So everytime the observer sees the bo...