Gravity and the double slit experiment

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Discussion Overview

The discussion explores the implications of using gravity as a detector in the double slit experiment, particularly how a localized gravitational field might affect the interference pattern of particles such as electrons or photons. The conversation includes theoretical considerations, potential experimental setups, and the role of gravitational interactions in quantum mechanics.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • Some participants propose that a localized gravitational field near one slit could delay the arrival of electrons, potentially affecting the interference pattern.
  • Others argue that if the gravitational interaction is strong enough, it could act as an observation, leading to the loss of interference if the delay exceeds the coherence length.
  • One participant contends that it is not feasible to 'cut off' gravity between the slits and raises concerns about relativistic effects causing electrons to behave differently based on their proximity to the gravitational field.
  • A beginner in quantum physics questions the rationale behind any deflection in the interference pattern due to gravity, asserting that it should not cause any indifference.
  • Some participants note that a significant gravitational interaction would require an ultra-dense object near one slit, drawing parallels to other setups involving electric potentials.
  • There is a discussion about whether gravity can serve as an interaction that causes wave function collapse, with arguments presented on both sides of the proposition.
  • One participant mentions that neutrons exhibit quantized energy states due to gravity, suggesting a relationship between gravity and quantum mechanics that could influence interference patterns.
  • Another participant suggests using photons instead of electrons in a modified double slit experiment involving a Bose–Einstein condensate, proposing that this could yield similar effects without the need for extreme conditions.

Areas of Agreement / Disagreement

Participants express a range of views on the role of gravity in the double slit experiment, with no consensus reached. Some agree on the hypothetical nature of the setup while others challenge the feasibility and implications of using gravity as a detector.

Contextual Notes

Limitations include the dependence on the strength of the gravitational field, the assumptions about coherence length, and the unresolved mathematical implications of relativistic effects on particle behavior.

Who May Find This Useful

This discussion may be of interest to those exploring the intersections of gravity and quantum mechanics, as well as individuals curious about the double slit experiment and its implications in theoretical physics.

hankaaron
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How would the double slit experiment work if we were to use gravity as a detector? That is, a very localized but massive gravitational field near one of the slits. Since we are not observing when an electron passes through the slit, the interference pattern should remain.

But on the detector screen the electron would arrive a bit later if it came from the slit nearest our miniature gravity field.
 
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If the gravitational interaction is strong enough, it can be an observation.
But on the detector screen the electron would arrive a bit later if it came from the slit nearest our miniature gravity field.
If that delay is longer than the coherence length, you lose interference.
 
Firstly this can't work as we can't just 'çut off' gravity between one slit and the other (provided they are close by).
Secondly, relativistic effects would kick in and we would be left with electrons going through the slits with different weights. Hence the pattern would be the close field one. (ie 2 shadows)- maybe I've simplified this too much, ill have to do the math on it.
 
But otherwise a very interesting thought.
 
well, i just a beginner in Quantum Physics, but i would like to know why would there be any kind of deflection in interference pattern. i believe gravitational field SHOULD NOT any cause any kind of indifference. if yes, i would like to know how and why?
 
Gravitational interaction is not special here - you would need some ultra-dense object close to one slit to see any difference, so the experiment is purely hypothetical, but the setup is similar to a different electric potential at one slit.
 
An issue is:can gravity serve as an interaction which causes collapse? There are certainly arguments for both sides of that proposition. If gravity is not a quantum force, you might guess the answer is NO.
 
Neutrons, bouncing above a surface due to gravity, show quantized energy states.http://www.nature.com/nphys/journal/v7/n6/full/nphys1970.html [2] Gravity and quantum mechanics work together, and you don't need more (well, apart from that ultra-dense object with a very well-defined momentum) to destroy interference.
 
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mfb said:
Gravitational interaction is not special here - you would need some ultra-dense object close to one slit to see any difference,

Electrons in the double slit seem very popular lately, but if we use photons instead, we don’t need to hire the LHC to create a Micro Black Hole. :smile:

Just prepare one slit with a Bose–Einstein condensate and run Slow light thru the slit, and the effect would be equivalent:

https://www.youtube.com/watch?v=EK6HxdUQm5s


= no interference
 
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  • #10
mfb said:
Neutrons, bouncing above a surface due to gravity, show quantized energy states.http://www.nature.com/nphys/journal/v7/n6/full/nphys1970.html [2] Gravity and quantum mechanics work together, and you don't need more (well, apart from that ultra-dense object with a very well-defined momentum) to destroy interference.

Nice references, very interesting (and clever) stuff.
 
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  • #11
DevilsAvocado said:
Electrons in the double slit seem very popular lately, but if we use photons instead, we don’t need to hire the LHC to create a Micro Black Hole. :smile:

Just prepare one slit with a Bose–Einstein condensate and run Slow light thru the slit, and the effect would be equivalent:

...

= no interference

And as always, Devil has those cool visuals... :smile:
 
  • #12
Thanks DrC, but you know me... sometimes there’s more ‘flashing’ going on... than actual entangled neurons producing something coherent in the avocado brain... :rolleyes:
 

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