2:37 AM
5

I am currently trying to find out about what exactly Feynman diagrams are, and up until now I have mainly used the lecture notes 'Mathematical ideas and notions of quantum field theory' by Etingof. In this notes, Feynman diagrams are merely used to easier calculate asymptotic series expansions fo...

1 hour later…
3:53 AM
3

Richard Feynman in this 60's public lecture claimed it's easy to prove "physical space cannot be discrete automata", otherwise it will soon violate existing physical observations towards the end of this lecture. But he didn't mention any proof or explanation there. I thought about this further an...

6 hours later…
9:49 AM
1

I was reading about particle accelerators in Wikipedia and I came across this. Depending on the energy and the particle being accelerated, circular accelerators suffer a disadvantage in that the particles emit synchrotron radiation. Why don't linear accelerators have this disadvantage. The part...

3 hours later…
12:21 PM
1

I want to begin my explanation using abstract mathematical explanation to repetition possibility by taking independent samples Xn from some continuous probability distribution: https://math.stackexchange.com/q/1739927/ If we applied this same principle and its conclusion and assumed that the univ...

5 hours later…
5:00 PM
1

Earth core temperature is range between 4,400° Celsius (7,952° Fahrenheit) to about 6,000° Celsius (10,800° Fahrenheit). Source Why can't Earth core melt whole planet? In other words, what stopping Earth to be melted down to its core?

5:51 PM
6

I am currently trying to understand standing waves. The key to the phenomenon is that: $$A\sin(kx+\omega t) + A\sin(kx-\omega t)=2A\sin(kx)\cos(\omega t)$$ The shape of $2A\sin(kx)\cos(\omega t)$ is constant, as only the amplitude changes with time due to the $\cos(\omega t)$. This creates the fa...