Physics:Quantum vacuum state
A quantum vacuum state is the lowest-energy state of a quantum system or field. In quantum field theory it is not simply empty space: fields can have zero-point fluctuations, vacuum expectation values, and observable effects even when no ordinary particles are present. The vacuum-state concept links field theory, particle physics, cosmology, and condensed matter systems.[1][2]
Not empty space
The quantum vacuum has no particles in a chosen field-mode description, but it can still contain fluctuations and correlations. Effects such as the Casimir effect, vacuum polarization, and spontaneous emission are often discussed using vacuum-state language.[3]
Observer and field dependence
The meaning of a vacuum can depend on the field theory, boundary conditions, and spacetime background. In curved spacetime or accelerating frames, different observers may not agree on the same particle content.[4]
Relation to other pages
Vacuum energy, zero-point energy, virtual particles, and false vacuum states are related ideas, but they emphasize different parts of the vacuum concept: energy density, ground-state motion, perturbative diagrams, or metastability.
See also
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References
- ↑ "Vacuum state". https://en.wikipedia.org/wiki/Vacuum_state.
- ↑ Schwartz, Matthew D. (2014). Quantum Field Theory and the Standard Model. Cambridge University Press. ISBN 978-1-107-03473-0.
- ↑ Schwartz, Matthew D. (2014). Quantum Field Theory and the Standard Model. Cambridge University Press. ISBN 978-1-107-03473-0.
- ↑ Wald, Robert M. (1994). Quantum Field Theory in Curved Spacetime and Black Hole Thermodynamics. University of Chicago Press. ISBN 978-0-226-87027-4.
Source attribution: Physics:Quantum vacuum state