1,849 reputation
725
bio website
location Mezőkövesd, Hungary
age 26
visits member for 3 years, 3 months
seen 10 hours ago

I mostly self learn Physics, I don't have a degree.

I have a good grasp on:

  • physics we learned at high school.
  • A-level physics topics.
  • Special relativity.
  • Maxwell equations.

Topics I get the idea but still struggle with the mathematics:

  • General relativity. (have a good grasp on the Riemann curvature tensor, but yet to get a good intuitive grasp the Ricci tensor and stress-energy tensor).
  • Quantum mechanics. (I tend to stick to wave-functions with or without asterisk and operators, the asymmetric braket notation still look too alien to me.)

Topic I barely scratched the surface on:

  • Quantum field theory. (I think I got the idea of the Fock space and the annihilation and creation operators, but still need a lot of work understand how and why it works.)

May
15
comment Intuitive understanding of the elements in the stress-energy tensor
Isn't $\gamma m c^2$ the total energy? I knew the rest energy is only $mc^2$.
May
14
comment Correlation between entangled photon polarisation measurement?
@Joseph Search for 'quantum malus law'. Basically it's the same as the classical one. But instead of relating the intensity of light beams, it tells the chance whether a photon with a given angle pass or fail the polarizer.
May
14
revised Intuitive understanding of the elements in the stress-energy tensor
added 234 characters in body
May
14
asked Intuitive understanding of the elements in the stress-energy tensor
May
14
answered Correlation between entangled photon polarisation measurement?
May
12
comment Why two different Lagrangians to derive geodesic equations?
Do you really want to derive geodesic equation with Lagrangians? I think it's simpler if you derive and practice differential geometric concepts in simple sphere. You should first understand the covariant derivative; when it's zero you defined parallel transport; when you parallel transport a vector towards the direction in points to, you'll follow a geodesic and that yields the geodesic equation, quite intuitively. Basically the equation says how do you need to change the coordinates of your velocity vector to remain on a straight path.
May
8
asked What is the experimental evidence that suggests space-time is curved?
May
4
answered Why would spacetime curvature cause gravity?
Apr
26
asked How to add together non-parallel rapidities?
Apr
26
comment How to derive addition of velocities without the Lorentz transformation?
Your first image seems to be removed, can you repost it?
Apr
26
answered Derivation of proper acceleration in terms of rapidity
Apr
24
asked Do two bodies spinning about the same axis in the opposite direction repel each other?
Apr
19
answered Is there a way to create an artificial solar eclipse?
Apr
11
asked What does Ricci tensor do with two vectors?
Apr
11
awarded  Autobiographer
Mar
10
awarded  Popular Question
Mar
1
comment Is it foolish to distinguish between covariant and contravariant vectors?
I think that number there should be $0.01$ and not $0.001$...
Feb
28
comment Is it possible to use hot cloudy water as a cloud chamber?
I'm sure I saw it in the vapor above it.
Feb
28
revised Is it possible to use hot cloudy water as a cloud chamber?
added 21 characters in body
Feb
27
asked Is it possible to use hot cloudy water as a cloud chamber?