Practical reference for integration on manifolds

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Discussion Overview

The discussion revolves around finding practical resources and examples for performing integrals over surfaces and volumes in the context of general relativity and manifold theory. Participants express a desire for concrete examples to better understand the application of theoretical concepts.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant seeks resources that provide numerous examples of integrals over surfaces and volumes in general relativity, expressing a need for practical applications of theoretical knowledge.
  • Another participant suggests "A Relativist's Toolkit: The Mathematics of Black-Hole Mechanics" by Eric Poisson, mentioning its potential usefulness despite not directly addressing the participant's request.
  • There is a discussion about the challenges of understanding concepts like pulling back a metric onto a submanifold and working with normal vectors, indicating a desire for more concrete examples to clarify these subtleties.
  • One participant references Poisson's book, noting that it covers hypersurfaces but does not mention pullbacks, and expresses uncertainty about the number of examples in other recommended texts on differentiable geometry.
  • Another participant mentions a book by Orodruin that includes a chapter on calculus on manifolds, suggesting it may contain relevant information or additional resources.
  • There is a light-hearted exchange about the ongoing study of Wald's work, indicating a shared experience among participants regarding the complexity of the material.

Areas of Agreement / Disagreement

Participants generally agree on the need for practical examples and resources, but there is no consensus on specific texts that meet these needs, and multiple suggestions are offered without clear preference.

Contextual Notes

Some participants express uncertainty about the number of examples available in the recommended books, and there is a mention of a long time since one participant last reviewed a particular resource, indicating potential limitations in their current knowledge of available materials.

etotheipi
I was trying to look for something that works a lot of examples of integrals over surfaces, volumes etc. in general relativity. Tong's notes and some others are good on the abstract/theoretical side but it'd really be better at this stage to get some practice with concrete examples in order to see how everything fits together. Does anyone know a good place? Thanks
 
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etotheipi said:
I was trying to look for something that works a lot of examples of integrals over surfaces, volumes etc. in general relativity.
This probably is not what you have in mind, but have you ever looked at "A Relativist's Toolkit: The Mathematics of Black-Hole Mechanics by Eric Poisson?

Videos by Poisson (look at google drive link):
 
Thanks, I hadn't come across that before but it looks like a nice set of videos.

What I'm looking for specifically is to get a feel for how in practice you go about doing things like pulling back a metric onto a submanifold, working out what the normal vectors are, and just generally converting integrals on general manifolds into doable integrals on ##\mathbf{R}^n##.

I think I have a vague, basic (very non-rigorous) idea of the theory, but struggle with the subtleties and figured some concrete examples might help.
 
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etotheipi said:
What I'm looking for specifically is to get a feel for how in practice you go about doing things like pulling back a metric onto a submanifold, working out what the normal vectors are, and just generally converting integrals on general manifolds into doable integrals on ##\mathbf{R}^n##.

Poisson does this in chapter 3 "Hypersurfaces" of his book, without mentioning, e.g., pullbacks.

I can't think of books that have loads of examples. I know of differentiable geometry books that present the theory in a readable manner (e.g., books by Frankel and by Fecko), but I am not sure how many examples that they present. Another possibility (which I haven't look at in 20 years) is a book on differential forms by David Darling.
 
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George Jones said:
Poisson does this in chapter 3 "Hypersurfaces" of his book, without mentioning, e.g., pullbacks.

I can't think of books that have loads of examples. I know of differentiable geometry books that present the theory in a readable manner (e.g., books by Frankel and by Fecko), but I am not sure how many examples that they present. Another possibility (which I haven't look at in 20 years) is a book on differential forms by David Darling.

Thanks, that sounds great, I'll take a look at Poisson's book!
 
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caz said:
You might check out @Orodruin ’s book
https://www.amazon.com/dp/1138056901/?tag=pfamazon01-20
It has a chapter on calculus on manifolds. Even if it is not what you are looking for, he might have some ideas on other places to look.

Question: when the table hits 12:00 are you finished with Wald?

I do actually have @Orodruin's very nice book, it's my go-to maths methods reference! There are some relevant problems at the end of that chapter which I haven't tried yet.

(Also, I'm a bit sleepy at the moment so I don't quite understand the last sentence, haha... but I think it's fair to say I will never be finished with Wald 😵)
 
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etotheipi said:
(Also, I'm a bit sleepy at the moment so I don't quite understand the last sentence, haha... but I think it's fair to say I will never be finished with Wald 😵)

The table is rotating. I was trying to impose order upon it. Vertical table implies that you have become one with Wald.
 
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