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TrickyDicky
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How are internal lines with no free ends of Feynman diagrams of the perturbative expansion of QFT related to the quantum tunnelling barrier's negative kinetic energy and the HUP of QM? (if they are related at all)
tom.stoer said:Good question.
I have to look for a paper from Jaffe which explains that vacuum bubble diagrams (w/o external lines) for the Casimir effect are an "effective limit" of standard 1st order diagrams with external lines for van-der-Waals forces. If this reasoning could be used in general than vacuum bubbles might be irrelevant.
tom.stoer said:Good question.
I have to look for a paper from Jaffe which explains that vacuum bubble diagrams (w/o external lines) for the Casimir effect are an "effective limit" of standard 1st order diagrams with external lines for van-der-Waals forces. If this reasoning could be used in general than vacuum bubbles might be irrelevant.
exactly, thanks!sheaf said:You mean http://arxiv.org/abs/hep-th/0503158" [Broken]?
Vacuum fluctuations, also known as quantum fluctuations, are temporary changes in the energy levels of a vacuum. According to quantum mechanics, even a completely empty space is filled with constantly fluctuating energy levels. These fluctuations are a fundamental aspect of quantum mechanics and play a role in many physical phenomena.
Vacuum fluctuations are a consequence of the uncertainty principle in quantum mechanics. This principle states that there is always a level of inherent uncertainty in the values of certain physical properties, such as position and momentum, at the quantum level. This leads to the constant fluctuations in the energy levels of a vacuum.
No, vacuum fluctuations cannot be directly observed. This is because they occur at a very small scale and are constantly changing. However, their effects can be observed in certain experiments, such as the Casimir effect, which is a measurable force caused by vacuum fluctuations between two closely spaced parallel plates.
No, vacuum fluctuations do not violate the law of conservation of energy. This is because the total energy of a vacuum remains constant, even though there are fluctuations in the energy levels. These fluctuations are temporary and do not result in a net gain or loss of energy.
Vacuum fluctuations have a very small impact on our everyday lives. They are constantly occurring at the quantum level, but their effects are only noticeable in specific situations, such as in certain experiments or theories in physics. However, without these fluctuations, the laws of quantum mechanics would not be able to accurately describe the behavior of particles and the universe as a whole.