I did more than one course of classical electromagnetism in college. Recently, however, after reading "How Relativity Connects Electric and Magnetic Fields" (http://galileo.phys.virginia.edu/classes/252/rel_el_mag.html) I was astounded to realize how little I knew about it! In college (if I...
I think that now I understand.
If there is nothing outside my lab there is also no spacetime "outside" it. So all we can say is that my universe (my lab) is rotating by making measures. We can’t ask WHY it’s rotating. All we can do is use the laws of physics to determine how things will...
I appreciate the answers. In “light” of them would like to reformulate my question. Suppose the universe ceases to exist (or never existed). From my laboratory I send several rays of light and from their trajectories I determine a metric for the universe. In function of this metric I determine...
Considerer a closed box into space:
• In constant acceleration.
• Turning around its axis.
Einstein used the first case as a thought experiment (http://galileo.phys.virginia.edu/classes/252/mass_and_energy.html) that led to the general theory of relativity: the occupant of the box could...