12:51 AM
2

As all pervasive, stationary fields, do the QFT fields (various Quark, electron, EM, etc.) constitute the modern equivalent of the traditional ether concept?

6 hours later…
6:44 AM
4

I'm taking a course on general relativity and I'm confused about something in my course notes. First there is an explanation about a curved 2D plane where it is shown how curvature can be defined by using parallel transport along a closed circuit. This yields one scalar value that characterizes t...

6 hours later…
12:55 PM
1

Suppose you are given a mass of 1kg. Einstein's theory of relativity says that all the mass can be converted into energy as per equation \$E = mc^2\$. So If you want to convert this whole mass of 1kg into energy, what will you do to that mass?

3 hours later…
4:01 PM
3

We know that, the speed of light in vacuum is independent of reference frame. I read the reason for this fact from Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?. Similarly, is the speed of light in a medium of refractive index \$n \neq 1\$ also independ...