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By looking at layman's books on physics I have picked up the idea that "virtual" particle-antiparticle pairs continually pop out of the vacuum and then back into it again.

Apparently according to the Heisenberg Uncertainty Principle the time that the particle pair can exist, [itex]\Delta t[/itex], is given by

[itex] \Delta t \approx h / \Delta E [/itex]

where [itex] \Delta E [/itex] is the energy of the particle pair.

Is there any lower limit to [itex]\Delta E[/itex] like the neutrino mass? Or could the particle pair be a pair of photons with any energy?

Could [itex]\Delta t[/itex] be billions of years if the particle-pair has a very very low energy ?

Apparently according to the Heisenberg Uncertainty Principle the time that the particle pair can exist, [itex]\Delta t[/itex], is given by

[itex] \Delta t \approx h / \Delta E [/itex]

where [itex] \Delta E [/itex] is the energy of the particle pair.

Is there any lower limit to [itex]\Delta E[/itex] like the neutrino mass? Or could the particle pair be a pair of photons with any energy?

Could [itex]\Delta t[/itex] be billions of years if the particle-pair has a very very low energy ?

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