Undergrad Coherence length of velocity fields

Click For Summary
Coherence length of velocity fields refers to the distance over which the structure of a velocity field is maintained before it becomes diffused. This concept is crucial in understanding how velocity fields behave in various contexts, including fluid dynamics and quantum mechanics. The term is not well-defined in the referenced paper, leading to confusion among readers. It is suggested that it may relate to quantum decoherence, but clarification from the authors would be beneficial. Overall, coherence length is essential for analyzing the persistence of wave structures in velocity fields.
Apashanka
Messages
427
Reaction score
15
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..
 
Space news on Phys.org
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
 

Thread 'Estimates — True Size of the Universe?'

I always thought it was odd that we know dark energy expands our universe, and that we know it has been increasing over time, yet no one ever expressed a "true" size of the universe (not "observable" universe, the ENTIRE universe) by just reversing the process of expansion based on our understanding of its rate through history, to the point where everything would've been in an extremely small region. The more I've looked into it recently, I've come to find that it is due to that "inflation"...
View full post »

Similar threads

Graduate The coherence length is much longer than the manufacturer claims
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Increase of coherent length in stimulated emission
  • · Replies 19 ·
Replies
19
Views
2K
Undergrad Does a Fabry Perot cavity charge in discrete steps?
  • · Replies 12 ·
Replies
12
Views
3K
High School We can't unite QM with GR because of what the Qfield is capable of
  • · Replies 3 ·
Replies
3
Views
1K
Struggling to understand the concept of this question (ice cube in water optics question)
  • · Replies 29 ·
Replies
29
Views
1K
Undergrad Special Relativity: an ideal experiment
  • · Replies 21 ·
Replies
21
Views
2K
Undergrad The curvature of space and curvature of spacetime
  • · Replies 21 ·
Replies
21
Views
2K
Graduate Question about cgs vs SI units in the context of the Debye Length
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad How to Show \(\psi_{i}\ket{\xi} = \xi_{i}\ket{\xi}\)?
  • · Replies 4 ·
Replies
4
Views
1K
The difference between the packet length and the cohererence length
  • · Replies 8 ·
Replies
8
Views
3K