What is the Structure of Classical General Relativity?

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Discussion Overview

The discussion revolves around the structure of classical general relativity as presented in a survey paper by David B. Malament. Participants explore various aspects of the theory, including its foundational elements, special topics like relative simultaneity, and connections to Newtonian gravitation. The scope includes theoretical insights and conceptual clarifications related to general relativity.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant shares a link to Malament's paper, highlighting its division into two parts: the structure of classical relativity theory and discussions on specific topics.
  • Another participant expresses appreciation for the lecture but indicates a lack of time to engage with the calculations, inviting others to contribute their thoughts.
  • A participant notes the potential for interesting insights within the paper, while humorously commenting on the complexity of the material.
  • Discussion includes specific sections of the paper that are deemed valuable, such as the calculation methods using 4-vector quantities, the formulation of Newtonian gravity in a spacetime context, and the definition of simultaneity in Minkowski spacetime.
  • Participants mention the importance of recovering global geometric structure from causal structure in the context of quantum gravity attempts.

Areas of Agreement / Disagreement

Participants express varying levels of engagement with the paper, with some appreciating specific sections while others remain uncertain about the overall insights. No consensus is reached on the interpretations or implications of the discussed topics.

Contextual Notes

Some participants reference specific notations and concepts that may depend on prior knowledge of general relativity and related mathematical frameworks, which could limit understanding for those less familiar with the subject.

wolram
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http://arxiv.org/PS_cache/gr-qc/pdf/0506/0506065.pdf

Title: Classical General Relativity
Authors: David B. Malament
Comments: 59 pages; 7 figures; to appear in Handbook of the Philosophy of Physics, eds. J. Butterfield and J. Earman, Elsevier

This survey paper is divided into two parts. In the first (section 2), I give a brief account of the structure of classical relativity theory. In the second (section 3), I discuss three special topics: (i) the status of the relative simultaneity relation in the context of Minkowski spacetime; (ii) the "geometrized" version of Newtonian gravitation theory (also known as Newton-Cartan theory); and (iii) the possibility of recovering the global geometric structure of spacetime from its "causal structure"
 
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Thank you,a very useful lecture,indeed.I don't have time right now to get through the calculations,so i'll let others share their comments.

Daniel.
 
wolram said:
http://arxiv.org/PS_cache/gr-qc/pdf/0506/0506065.pdf

Title: Classical General Relativity
Authors: David B. Malament
Comments: 59 pages; 7 figures; to appear in Handbook of the Philosophy of Physics, eds. J. Butterfield and J. Earman, Elsevier

I think there may be some interesting insights buried in this paper, but reading it I feel like I'm being tied up in fibre bundles (note: that's a bad pun, not to be taken too literally).
 
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The notation is similar to Wald's notation.

Here are some of the good parts IMO (not usually found in standard treatments):

2.3 Space/Time Decomposition at a Point and Particle Dynamics shows how to calculate using 4-vector quantities.
2.5 Einstein’s Equation and 3.2 Geometrized Newtonian Gravitation Theory discusses a spacetime formulation of Newtonian Gravity
3.1 Relative Simultaneity in Minkowski Spacetime discusses the "definition of simultaneity"
3.3 Recovering Global Geometric Structure from “Causal Structure” may play an important role in recovering spacetime structure from causal-structure-based attempts to quantum gravity.

If you google the author, you'll find some more detailed course notes.
 

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