- #1

Chenkel

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- TL;DR Summary
- I just saw a video on YouTube talk about the basics of GR, and I have a few questions that hopefully the kind community of physics forums might be able to answer.

Hello everyone!

I was just watching a video, and to my surprise I was able to understand a little about GR (General Relativity). I'm looking to confirm my understanding, and also ask some basic questions.

From what I understand in Newtonian gravity the space time is considered to be uniform, contiguous, and orthogonal. From Newton's perspective a force has to be acting on the object to make it move in a curve around Earth.

Under GR, instead of the velocity vector changing for the orbiting body, the basis vectors for the coordinate system of the rotating body are changing. This is because you can create an orbiting body by warping space, and leaving the velocity vector unchanging. This effectively eliminates the Newtonian force of gravity, while maintaining a orbiting body while it moves in a straight line in curved space-time.

I have a few questions:

What kind of basis vectors are we looking at for the local coordinate system of the orbiting body?

Is the Newtonian gravitational force a psuedo force?

Why is GR more accurate than a Newtonian gravitational model?

Is there a relatively easy way I can understand the GR equations with an intermediate understanding of calculus?

Does GR explain anything at the quantum level?

Also what would your advice be for someone just getting the hang of the theory?

I am making this post out of inspiration, and I feel I admittedly have not done a lot of research, so my apologies if I made any assumptions that make it difficult to enlighten my understanding.

If you would like to reply and discuss the topics I've laid out, or add something, please feel free to, I am looking forward to what you have to say.

Let me know what you think, thank you!

I was just watching a video, and to my surprise I was able to understand a little about GR (General Relativity). I'm looking to confirm my understanding, and also ask some basic questions.

From what I understand in Newtonian gravity the space time is considered to be uniform, contiguous, and orthogonal. From Newton's perspective a force has to be acting on the object to make it move in a curve around Earth.

Under GR, instead of the velocity vector changing for the orbiting body, the basis vectors for the coordinate system of the rotating body are changing. This is because you can create an orbiting body by warping space, and leaving the velocity vector unchanging. This effectively eliminates the Newtonian force of gravity, while maintaining a orbiting body while it moves in a straight line in curved space-time.

I have a few questions:

What kind of basis vectors are we looking at for the local coordinate system of the orbiting body?

Is the Newtonian gravitational force a psuedo force?

Why is GR more accurate than a Newtonian gravitational model?

Is there a relatively easy way I can understand the GR equations with an intermediate understanding of calculus?

Does GR explain anything at the quantum level?

Also what would your advice be for someone just getting the hang of the theory?

I am making this post out of inspiration, and I feel I admittedly have not done a lot of research, so my apologies if I made any assumptions that make it difficult to enlighten my understanding.

If you would like to reply and discuss the topics I've laid out, or add something, please feel free to, I am looking forward to what you have to say.

Let me know what you think, thank you!