Coherence length of velocity fields

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Discussion Overview

The discussion centers around the term "coherence length of velocity field" as mentioned in a specific paper. Participants seek clarification on its definition and implications, particularly in the context of wave propagation and possibly quantum mechanics.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant expresses frustration over the lack of definition for "coherence length" in the referenced paper.
  • Another participant suggests that coherence length typically refers to the distance over which wave structures can be maintained before becoming diffused.
  • A further contribution mentions a potential connection to quantum decoherence, indicating that the term may have implications in quantum mechanics.
  • Some participants reference a Wikipedia article on coherence length as a reasonable assumption for understanding the term.
  • There is a clarification that the term may specifically refer to the coherence length of the peculiar velocity field.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the definition of coherence length, and multiple interpretations and assumptions about its meaning remain in the discussion.

Contextual Notes

The discussion lacks a clear definition from the original paper, and assumptions about the term's meaning depend on interpretations of coherence length in different contexts, such as wave propagation and quantum mechanics.

Apashanka
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I have came across a term "coherence length of velocity field ##\lambda## ",tried to search in the internet but doesn't find any result...will anyone please give a brief summary of this in this context..
 
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You'll have to give more context and details. Where exactly did you read this?
 
DrClaude said:
You'll have to give more context and details. Where exactly did you read this?
Okay fine the paper is
https://arxiv.org/abs/1703.08809And the line where I have read this is in the 2nd paragraph
IMG_20190531_194308.jpg
 
Can anyone please help..
 
It's very frustrating that they never define what they mean by coherence length.

Typically, coherence length is the distance for which structures in propagating waves can be maintained. That is, if you start a pulse with a specific shape, after the coherence length the pulse will become diffused, its structure lost.

In quantum mechanics, this might also have something to do with quantum decoherence. But in any event, it would have been nice if they would have explained what they meant by the term. In the mean time, a reasonable assumption that they're talking about the exact same thing as explained in this Wikipedia article:
https://en.wikipedia.org/wiki/Coherence_length
 

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