What are Modular Lie Algebras and How Do They Apply to Function Spaces?

  • Context: Graduate 
  • Thread starter Thread starter dx
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around the concept of modular Lie algebras and their potential applications to function spaces, particularly those more general than Lp spaces. Participants explore theoretical aspects, motivations, and structural questions related to these algebras.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that modular Lie algebras could be used to construct more general function spaces than Lp, referencing the work of Musielak and the use of convex functions in integrals.
  • Another participant questions the role and structure of Lie algebras, seeking clarification on their motivation and relevance to the forum topic.
  • A participant expresses apprehension about modular Lie algebras, indicating a preference for modular analysis instead.
  • One participant provides a brief explanation of modular Lie algebras, noting their occurrence in string theory as Witt algebras and presenting a lemma about nilpotent endomorphisms in finite-dimensional vector spaces.
  • Another participant challenges the previous explanation, asserting that it is not a proper definition and emphasizes that modular Lie algebras are specifically defined over fields of positive characteristic.
  • A later reply reiterates the connection of modular Lie algebras to Witt algebras, suggesting a distinction between the two concepts.

Areas of Agreement / Disagreement

Participants express differing views on the definitions and implications of modular Lie algebras, with some providing explanations while others challenge those explanations. The discussion remains unresolved regarding the clarity and applicability of the concepts presented.

Contextual Notes

There are limitations in the understanding of modular Lie algebras among participants, with some definitions and relationships being contested. The discussion also highlights the dependence on the characteristics of the underlying fields in the context of these algebras.

dx
Homework Helper
Messages
2,143
Reaction score
52
TL;DR
function spaces more general than Lp
I feel that it is possible to construct function spaces more general than those of the type Lp using the theory of modular Lie algebras. Such spaces have been considered long ago by Musielak. essentially, one considers functions

φ(λ|f(x)|) dx

where φ is a convex function up, which can sometimes be relaxed to functions such as φ(u) = eu - 1.
I welcome comments from anyone who is informed about such issues.
 
Last edited:
Physics news on Phys.org
What is the role of the Lie algebras?

What is the structure of these spaces?

What is the motivation?

Why in this forum, why not the analysis forum?

Any reference?
 
  • Like
Likes   Reactions: fresh_42
I'd fear less the modular Lie algebras as I would fear the modular analysis!
 
I am aware that not everyone knows what a modular Lie algebra is, so I offer the following brief explanation. modular lie algebras also occur in string theory under the name Witt algebra. for instance there is the following
Lemma. Let f be an endomorphism of a finite-dimensional vector space V such that tr(fn) = 0 ∀ n ∈ ℕ. Then f is nilpotent.
one must consider the characteristic of the underlying base field F, where char (F) = p > 0
 
dx said:
I am aware that not everyone knows what a modular Lie algebra is, so I offer the following brief explanation. modular lie algebras also occur in string theory under the name Witt algebra. for instance there is the following
Lemma. Let f be an endomorphism of a finite-dimensional vector space V such that tr(fn) = 0 ∀ n ∈ ℕ. Then f is nilpotent.
one must consider the characteristic of the underlying base field F, where char (F) = p > 0
This is not a definition and as written is unralated to Lie algebras!

A modular Lie algebra is a Lie algebra over a field of positive characteristic.
 
dx said:
I am aware that not everyone knows what a modular Lie algebra is, so I offer the following brief explanation. modular lie algebras also occur in string theory under the name Witt algebra.
Witt algebra is something else.
 

Similar threads

  • · Replies 8 ·
Replies
8
Views
5K
  • · Replies 1 ·
Replies
1
Views
4K
  • · Replies 2 ·
Replies
2
Views
5K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
4
Views
4K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 13 ·
Replies
13
Views
11K
  • · Replies 13 ·
Replies
13
Views
3K
  • · Replies 11 ·
Replies
11
Views
3K