Define Quantum fluctuations
Answers
Quantum Fluctuations are allowed by a principle in Quantum Mechanics by a principle known as the Uncertainty Principle.
Actually the energy conservation principle is locally violated. Particles and Anti Particles are created and annihilated within a short span of time in space. So greater is the energy of the pair, lesser is its duration of survival. Infact vacuum is not completely 'empty' it constantly suffers fluctuations whereby such particles of range of energy are created and annihilated. However the scale of fluctuation is too small to observe.
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In quantum physics, a quantum fluctuation (or vacuum state fluctuation or vacuum fluctuation) is the temporary random change in the amount of energy in a point in space, as prescribed by Werner Heisenberg's uncertainty principle.