General relativity with focus on action?

Click For Summary
SUMMARY

The discussion centers on the use of the action principle in general relativity (GR) and its application in deriving equations of motion. Key texts mentioned include "Landau and Lifshitz Volume 2," which effectively utilizes the action principle to derive the Einstein field equations, and the Hilbert action, recognized as a fundamental heuristic argument in this context. Participants emphasize the importance of understanding the action of fields and suggest that the action principle is a versatile tool for deducing equations of motion based on symmetry principles.

PREREQUISITES
  • Understanding of the action principle in physics
  • Familiarity with the Einstein field equations
  • Knowledge of Lagrangian formalism
  • Basic concepts of general relativity
NEXT STEPS
  • Study "Landau and Lifshitz Volume 2" for insights on the action principle in GR
  • Explore the Hilbert action and its implications in general relativity
  • Learn about Lagrangian mechanics and its application in deriving equations of motion
  • Research the role of symmetry principles in formulating physical laws
USEFUL FOR

Students and educators in physics, particularly those focusing on general relativity, theoretical physicists interested in the action principle, and anyone seeking to deepen their understanding of the foundations of GR.

LCSphysicist
Messages
644
Reaction score
162
I am having a class of general relativity. It seems that the professor will follow an approach which consist of achieve the action, and variate it to get the equations of motion (indeed, that's how we already got the geodesic equation, the dynamics of a particle in electromagnetism, the equation of the fields itself, and the action of massless particle, etc...). Do you know any book that follows such approach? That is, a book that focus mainly on the action of the fields itself.
 
Physics news on Phys.org
Dirac derives GR equations from the principle of action.
 
  • Like
Likes   Reactions: dextercioby and vanhees71
Nearly every book on GR discusses the action: Carroll, Wald, d'Inverno, etc. Which book do you use?
 
  • Like
Likes   Reactions: vanhees71
My favorite for introductory GR is Landau+Lifshitz vol. 2. He uses the action principle to derive the Einstein field equation. The Hilbert action is the most simple heuristic argument for why these equations should look as they look.
 
  • Like
Likes   Reactions: anuttarasammyak
Introduction to General Relativity by Bambi.

Excerpt from a book description:

"Following the approach of Lev Landau and Evgenii Lifshitz, this book introduces the theory of special and general relativity with the Lagrangian formalism and the principle of least action."

I found the book quite readable and going
straight to its object.
 
  • Like
  • Informative
Likes   Reactions: PeroK, anuttarasammyak and vanhees71
vanhees71 said:
My favorite for introductory GR is Landau+Lifshitz vol. 2. He uses the action principle to derive the Einstein field equation. The Hilbert action is the most simple heuristic argument for why these equations should look as they look.
I agree that LL vol 2 is good. You mention Hilbert action as a heuristic argument. Is heuristic the right word here. I thought of Einsteins intuitive manner of developing his equations as heuristic. I would regard Hilbert's development as quite formal.
 
  • Like
Likes   Reactions: vanhees71
What you call "heuristic" is pretty much a question of your preknowledge. For me the action principle is the most versatile tool to guess equations of motion given a symmetry principle and I think it's much more "intuitive" or "heuristic" than Einstein's derivation.
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 1 ·
Replies
1
Views
665
  • · Replies 11 ·
Replies
11
Views
4K
  • · Replies 0 ·
Replies
0
Views
1K
  • · Replies 16 ·
Replies
16
Views
8K
  • · Replies 10 ·
Replies
10
Views
1K
Replies
26
Views
6K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 37 ·
2
Replies
37
Views
5K
  • · Replies 1 ·
Replies
1
Views
3K