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	A '''~~quantum~~ false vacuum''' is a metastable vacuum state that is locally stable but not the true lowest-energy state of a field theory. It can persist for a long time if a barrier separates it from a lower-energy vacuum, but quantum tunnelling or thermal effects may allow decay. False-vacuum ideas appear in particle physics, cosmology, inflationary models, and discussions of vacuum stability.~~<ref>{{cite web \|title=False~~ vacuum ~~\|url=https://en.wikipedia.org/wiki/False_vacuum \|website=Wikipedia \|access~~-~~date=19 May 2026}}</ref><ref>{{cite journal \|collaboration=Particle Data Group \|title=Review~~ of ~~Particle Physics \|journal=Physical Review D \|volume=110 \|issue=3 \|pages=030001 \|year=2024 \|id=DOI 10~~.~~1103/PhysRevD.110~~.~~030001}}</ref>~~		'''false vacuum''' is a Book II topic in the Quantum Collection. A quantum false vacuum is a metastable vacuum state that is locally stable but not the true lowest-energy state of a field theory. It can persist for a long time if a barrier separates it from a lower-energy vacuum, but quantum tunnelling or thermal effects may allow decay. False-vacuum ideas appear in particle physics, cosmology, inflationary models, and discussions of vacuum stability. A quantum false vacuum is a metastable vacuum state that is locally stable but not the true lowest-energy state of a field theory. It can persist for a long time if a barrier separates it from a lower-energy vacuum, but quantum tunnelling or thermal effects may allow decay.
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	== Standard Model context ==		== Standard Model context ==
	The measured Higgs and top-quark parameters are used to study whether the electroweak vacuum is absolutely stable, metastable, or sensitive to physics beyond the Standard Model.<ref>{{cite journal \|collaboration=Particle Data Group \|title=Review of Particle Physics \|journal=Physical Review D \|volume=110 \|issue=3 \|pages=030001 \|year=2024 \|id=DOI 10.1103/PhysRevD.110.030001}}</ref>		The measured Higgs and top-quark parameters are used to study whether the electroweak vacuum is absolutely stable, metastable, or sensitive to physics beyond the Standard Model.<ref>{{cite journal \|collaboration=Particle Data Group \|title=Review of Particle Physics \|journal=Physical Review D \|volume=110 \|issue=3 \|pages=030001 \|year=2024 \|id=DOI 10.1103/PhysRevD.110.030001}}</ref>

			== Description ==
			'''false vacuum''' is a matter-scale concept used to organize how quantum theory describes atoms, particles, fields, condensed matter, plasma, or spacetime-related systems. In the Quantum Collection it is placed by scale so the reader can move from materials and molecules down to subatomic degrees of freedom.

			== Quantum context ==
			At this scale, the relevant behavior is controlled by quantized states, interactions, conservation laws, and the way excitations or particles are observed. The concept is normally linked to measurable properties such as energy, momentum, charge, spin, spectra, scattering rates, or collective modes.

			== Role in the collection ==
			This page provides a compact reference point for related pages in Book II. It should be read together with nearby matter-scale topics and the corresponding foundations in [[Physics:Quantum mechanics\|quantum mechanics]].<ref name="matter-wiki">{{cite web \|url=https://en.wikipedia.org/wiki/Quantum_mechanics \|title=Quantum mechanics \|website=Wikipedia \|access-date=2026-05-20}}</ref>

	=See also=		=See also=

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{{Short description|Metastable vacuum state that is not the true lowest-energy state}}

{{Quantum matter backlink|Vacuum and spacetime}}

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A '''quantum false vacuum''' is a metastable vacuum state that is locally stable but not the true lowest-energy state of a field theory. It can persist for a long time if a barrier separates it from a lower-energy vacuum, but quantum tunnelling or thermal effects may allow decay. False-vacuum ideas appear in particle physics, cosmology, inflationary models, and discussions of vacuum stability.<ref>{{cite web |title=False vacuum |url=https://en.wikipedia.org/wiki/False_vacuum |website=Wikipedia |access-date=19 May 2026}}</ref><ref>{{cite journal |collaboration=Particle Data Group |title=Review of Particle Physics |journal=Physical Review D |volume=110 |issue=3 |pages=030001 |year=2024 |id=DOI 10.1103/PhysRevD.110.030001}}</ref>
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[[File:Quantum_false_vacuum_yellow.png|thumb|280px|False vacuum: a metastable state in a vacuum-energy landscape.]]
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== Metastability ==
A false vacuum is stable against small disturbances but can decay through a nonclassical transition. The decay is often described by bubble nucleation, in which a region of lower-energy vacuum forms and expands if energetically favored.<ref>{{cite web |title=False vacuum |url=https://en.wikipedia.org/wiki/False_vacuum |website=Wikipedia |access-date=19 May 2026}}</ref>

== Cosmological role ==
False-vacuum states are used in models of cosmic inflation and phase transitions in the early universe. They provide a way to connect quantum fields with large-scale spacetime evolution.

== Standard Model context ==
The measured Higgs and top-quark parameters are used to study whether the electroweak vacuum is absolutely stable, metastable, or sensitive to physics beyond the Standard Model.<ref>{{cite journal |collaboration=Particle Data Group |title=Review of Particle Physics |journal=Physical Review D |volume=110 |issue=3 |pages=030001 |year=2024 |id=DOI 10.1103/PhysRevD.110.030001}}</ref>

=See also=
{{#invoke:PhysicsQC|tocHeadingAndList|Physics:Quantum basics/See also/Matter}}

=References=
{{reflist|3}}

{{Author|Harold Foppele}}

{{Sourceattribution|Physics:Quantum false vacuum|1}}