Understanding Tensors & General Relativity

  • Thread starter Thread starter jmatt
  • Start date Start date
  • Tags Tags
    Tensors Video
jmatt
Messages
23
Reaction score
1
I enjoyed this video about tensors very much. I would recommend it to anyone seeking to understand the concept in general and general relativity specifically.

https://vimeo.com/32413024

You can fast forward through the repetitive parts and try to place yourself in the role of beginner as you watch.

Do you think anything essential is missing in this presentation?
 
Physics news on Phys.org
I forgot to mention I found the emphasis on the association between basis vectors and components to be powerful. It leads to moving beyond thinking of a vector as an arrow to thinking of it as one of many possible associations between basis vectors and components. This generalized association is a good conceptual definition of a tensor in my opinion. It's a good way to find your footing as you explore.
 

Thread 'I don't see how a black hole's event horizon can be crossed'

OK, so this has bugged me for a while about the equivalence principle and the black hole information paradox. If black holes "evaporate" via Hawking radiation, then they cannot exist forever. So, from my external perspective, watching the person fall in, they slow down, freeze, and redshift to "nothing," but never cross the event horizon. Does the equivalence principle say my perspective is valid? If it does, is it possible that that person really never crossed the event horizon? The...
View full post »

Thread 'Question about Parallel Transport'

In this video I can see a person walking around lines of curvature on a sphere with an arrow strapped to his waist. His task is to keep the arrow pointed in the same direction How does he do this ? Does he use a reference point like the stars? (that only move very slowly) If that is how he keeps the arrow pointing in the same direction, is that equivalent to saying that he orients the arrow wrt the 3d space that the sphere is embedded in? So ,although one refers to intrinsic curvature...
View full post »

Thread 'Trying to calculate proper time of worldlines using rotating frames'

So, to calculate a proper time of a worldline in SR using an inertial frame is quite easy. But I struggled a bit using a "rotating frame metric" and now I'm not sure whether I'll do it right. Couls someone point me in the right direction? "What have you tried?" Well, trying to help truly absolute layppl with some variation of a "Circular Twin Paradox" not using an inertial frame of reference for whatevere reason. I thought it would be a bit of a challenge so I made a derivation or...
View full post »

Similar threads

I Learn Physics with Eigenchris: Relativity & Tensors
Replies
12
Views
4K
A Weyl tensor and coordinate acceleration
Replies
12
Views
2K
I How do non-diagonal indices of a metric allow for local flatness?
Replies
22
Views
400
Is the Lie derivative a tensor itself?
Replies
4
Views
2K
Understanding Tensors for General Relativity: A Comprehensive Guide
Replies
2
Views
2K
I Metric Tensor as Simplest Math Object for Describing Space
Replies
6
Views
2K
I The Order and Valence of Tensors
Replies
6
Views
4K
Understanding the Role of Tensor Calculus in General Relativity
Replies
2
Views
1K
B Transformation Rules For A General Tensor M
Replies
1
Views
2K
I Forces and gravitational time dilation
Replies
11
Views
2K

Hot Threads

Recent Insights

Back
Top