The Exterior Covariant Derivative: Understanding Connections and Fibre Bundles

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Discussion Overview

The discussion revolves around the concept of the exterior covariant derivative, particularly in relation to connections and fibre bundles. Participants are seeking definitions and explanations that clarify these concepts, especially in the context of physics and mathematical calculations.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant requests a clearer definition of the exterior covariant derivative, indicating that existing resources, such as Wikipedia, lack sufficient detail for practical calculations.
  • Another participant questions what specific aspects of the Wikipedia article are unclear, suggesting it is relatively complete.
  • A participant expresses confusion regarding the definition of connection, specifically the terms "horizontal" and "vertical" components, and seeks an explanation that includes indices for better understanding.
  • It is proposed that understanding the covariant exterior connection requires a foundational grasp of connections over fibre bundles, particularly G-bundles, indicating a layered complexity in the topic.
  • A reference to Nakahara's book is made as a potential resource for understanding the decomposition technique related to horizontal and vertical components in fibre bundles.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the clarity of existing definitions or the sufficiency of resources available. Multiple viewpoints on the understanding of connections and their applications in fibre bundles remain evident.

Contextual Notes

Participants express varying levels of familiarity with the concepts, indicating that assumptions about prior knowledge may affect the discussion. The need for definitions using indices suggests a gap in mathematical understanding that is not yet resolved.

matness
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Can you give me the definition of exterior covariant derivative or any reference web page ?

Wiki does not involve enough info.I am not able to do calculation with respect to given definition there.

Thanks in advance
 
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The wikipedia article seems relatively complete to me. What specifically don't you understand about it?
 
Because the definition of connection in my mind is : "a bilinear connection satisfying certain properties."
I don't know what horizantal/ vertical component mean exactly.
what do "D" to a p-form for example?
I need a definition or explanation using indices at first, because i am trying to understand smt related to physics.
 
matness said:
Because the definition of connection in my mind is : "a bilinear connection satisfying certain properties."

Then it sounds as though you're familiar with the concept of a connection only within the context of a connection on a differentiable manifold. To understand the idea of a covariant exterior connection you'll need to understand the more general idea of a connection over a fibre bundle. It would, in my opinion, be a waste of time to attempt to do what you're asking without even a basic idea of what a connection over a fibre bundle is; to be more precise, you'll need to know what a connection over a G-bundle is in order to be able to appreciate the idea of a covariant exterior derivative.

By the way, the "horizontal" and "vertical" bits refer to a decomposition technique used when looking at subspaces over a fibre bundle. Nakahara's book has a decent introduction to this.
 

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