Why are quantum fluctuations amplified when viewed on a smaller scale?

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Discussion Overview

The discussion centers around the amplification of quantum fluctuations when observed at smaller scales, exploring the relationship between wavelength, frequency, and energy requirements in quantum physics. Participants reference concepts from popular science literature and engage in clarifying misunderstandings related to these phenomena.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants note that all fluctuations appear larger when viewed at smaller scales, using the analogy of an ant observing a ploughed field.
  • One participant suggests that waves become more energetic when viewed on smaller scales, which is challenged by another participant who argues that smaller wavelengths correspond to larger frequencies, requiring higher energies to resolve them.
  • A later reply questions whether the increase in frequency outweighs the decrease in wavelength, implying a need for more energy overall.
  • Another participant asserts that books aimed at lay audiences may contain inaccuracies and emphasizes the importance of consulting multiple sources for a correct understanding.
  • One participant states that the energy is necessary to reduce uncertainty to a level that allows for distinguishing small scales.

Areas of Agreement / Disagreement

Participants express differing views on the interpretation of quantum fluctuations and the implications of wavelength and frequency changes. There is no consensus on whether the book's explanation is accurate or if it leads to misunderstandings.

Contextual Notes

Participants highlight the complexity of the relationship between wavelength, frequency, and energy, indicating that misunderstandings may arise from oversimplified explanations in popular science literature. The discussion reflects unresolved questions about the nature of quantum fluctuations and their implications at different scales.

Mukilab
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Why are quantum fluctuations amplified when viewed on a smaller scale?

I read about this in 'elegant universe' but the book never answered my question.
 
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Mukilab said:
Why are quantum fluctuations amplified when viewed on a smaller scale?

I read about this in 'elegant universe' but the book never answered my question.

All fluctuations look big when viewed at small scales. For an ant, a newly ploughed field is full of rugged hills, while for us, seen from far, it looks very uniform.
 
The way the book explained it, it sounded like the waves actually became more energetic when viewed on a smaller scale.
 
Mukilab said:
The way the book explained it, it sounded like the waves actually became more energetic when viewed on a smaller scale.

This is a misunderstanding. On smaller scales, waves have a smaller wavelength lambda, hence a larger frequency omega = 2 pi/lambda, and hence are resolvable only with larger energies of the order of E = omega hbar.

This is why one needs huge accelerators to discover news at the smallest scales.
 
A. Neumaier said:
This is a misunderstanding. On smaller scales, waves have a smaller wavelength lambda, hence a larger frequency omega = 2 pi/lambda, and hence are resolvable only with larger energies of the order of E = omega hbar.

This is why one needs huge accelerators to discover news at the smallest scales.

So was the book incorrect?

Would the increase in frequency be larger than the decrease in wavelength, creating a need for more energy overall?
 
Mukilab said:
So was the book incorrect?
Books for laymen are often inaccurate, bordering sometimes on incorrectness.
To get a correct view of things, one shouldn't rely too much on a single source.
Mukilab said:
Would the increase in frequency be larger than the decrease in wavelength, creating a need for more energy overall?
Frequency and wavelength are inverse proportional, so this question doesn't make sense.

The energy is needed to reduce the uncertainty to a level where one can distinguish the small scales.
 

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