What happens when bosons become distinguishable?

In summary: Therefore, the concept of a "fast camera" is not applicable to this scenario.In summary, the conversation discusses a thought experiment about a system of bosons at high density and low temperature, and the possibility of using a high resolution, ultrafast tomographic imaging system to track individual particles in the system. However, due to the nature of the system, it is not possible to track individual particles and therefore the concept of a "fast camera" is not applicable.
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Philip Koeck
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Assuming a system of bosons at high density and low temperature so that they obey Bose-Einstein statistics. If one had a high resolution, ultrafast tomographic imaging system that would allow to track every particle in this system and therefore make the particles distinguishable, what would happen to the equlibrium distribution for this system? Would the BE-distribution be replaced by a Boltzmann distribution as soon as the particles are imaged?
 
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Philip Koeck said:
If one had a high resolution, ultrafast tomographic imaging system that would allow to track every particle in this system and therefore make the particles distinguishable

It wouldn't. You would be making position measurements of particles at very short time intervals, yes; but you would not be able to deduce from this data which particles in the measurements at time ##t## corresponded to which particles in the measurements at time ##t + \epsilon##. When physicists talk about being able to "track" particular particles in measurements (for example, in cloud chambers or bubble chambers), they are talking about cases where there are only a small number of particles that are sufficiently separated spatially to be tracked individually. The system you are talking about does not meet that requirement.
 
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PeterDonis said:
It wouldn't. You would be making position measurements of particles at very short time intervals, yes; but you would not be able to deduce from this data which particles in the measurements at time ##t## corresponded to which particles in the measurements at time ##t + \epsilon##. When physicists talk about being able to "track" particular particles in measurements (for example, in cloud chambers or bubble chambers), they are talking about cases where there are only a small number of particles that are sufficiently separated spatially to be tracked individually. The system you are talking about does not meet that requirement.
I am talking about a thought experiment so I don't need to limit myself to what is technically feasible. If one had a sufficiently fast camera, would the act of observing the particles change their equilibrium distribution?
 
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Philip Koeck said:
I am talking about a thought experiment so I don't need to limit myself to what is technically feasible.

It's not a matter of technical feasibility. There are no states of a boson gas at high density and low temperature that correspond to "individual bosons following trackable trajectories". But there would need to be such states for measurements to allow you to track individual bosons.
 
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1. What are bosons and why do they become distinguishable?

Bosons are a type of subatomic particle that follow Bose-Einstein statistics, meaning they can occupy the same quantum state. They become distinguishable when they have different quantum numbers, such as spin or charge.

2. What happens to bosons when they become distinguishable?

When bosons become distinguishable, they no longer follow Bose-Einstein statistics and instead follow Maxwell-Boltzmann statistics. This means they can no longer occupy the same quantum state and behave more like classical particles.

3. How does the behavior of bosons change when they become distinguishable?

The behavior of bosons changes from being able to occupy the same quantum state to having to compete for available quantum states. This can lead to a decrease in the overall energy and a decrease in the number of bosons in the ground state.

4. Can bosons become distinguishable under any circumstances?

Yes, bosons can become distinguishable under certain conditions, such as at extremely low temperatures or high densities. In these conditions, bosons will undergo a phase transition and become distinguishable.

5. How does the distinguishability of bosons affect their properties, such as conductivity or superfluidity?

The distinguishability of bosons can greatly affect their properties. For example, in a superfluid, the bosons are indistinguishable and can flow without any resistance. However, if the bosons become distinguishable, the superfluid behavior will be disrupted and the material may become more resistive.

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