False vacuum

Short description: Hypothetical vacuum, less stable than true vacuum

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A scalar field φ (which represents physical position) in a false vacuum. The energy E is higher in the false vacuum than that in the true vacuum or ground state, but there is a barrier preventing the field from classically rolling down to the true vacuum. Therefore, the transition to the true vacuum must be stimulated by the creation of high-energy particles or through quantum-mechanical tunneling.

In quantum field theory, a false vacuum[1] is a hypothetical vacuum state that is locally stable but does not occupy the most stable possible ground state.[2] In this condition it is called metastable. It may last for a very long time in this state, but could eventually decay to the more stable one, an event known as false vacuum decay. The most common suggestion of how such a decay might happen in our universe is called bubble nucleation‌—if a small region of the universe by chance reached a more stable vacuum, this "bubble" (also called "bounce")[3][4] would spread.

A false vacuum exists at a local minimum of energy and is therefore not completely stable, in contrast to a true vacuum, which exists at a global minimum and is stable.

## Contents

* 1 Definition of true vs. false vacuum
* 2 Implications
* 2.1 Existential threat
* 2.2 Inflation
* 3 Vacuum decay varieties
* 3.1 Electroweak vacuum decay
* 3.2 Other decay modes
* 4 Bubble nucleation
* 4.1 Nucleation seeds
* 4.1.1 Black holes as nucleation seeds
* 5 Bubble propagation
* 6 False vacuum decay in fiction
* 7 See also
* 8 References
* 9 Further reading
* 10 External links

## Definition of true vs. false vacuum

A vacuum is defined as a space with as little energy in it as possible. Despite the name, the vacuum still has quantum fields. A true vacuum is stable because it is at a global minimum of energy, and is commonly assumed to coincide with the physical vacuum state in which we live. It is possible that a physical vacuum state is a configuration of quantum fields representing a local minimum but not global minimum of energy. This type of vacuum state is called a "false vacuum".

## Implications

### Existential threat

If our universe is in a false vacuum state rather than a true vacuum state, then the decay from the less stable false vacuum to the more stable true vacuum (called false vacuum decay) could have dramatic consequences.[5][6] The effects could range from complete cessation of existing fundamental forces, elementary particles and structures comprising them, to subtle change in some cosmological parameters, mostly depending on the potential difference between true and false vacuum. Some false vacuum decay scenarios are compatible with the survival of structures like galaxies, stars,[7][8] and even biological life,[9] while others involve the full destruction of baryonic matter[10] or even immediate gravitational collapse of the universe.[11] In this more extreme case, the likelihood of a "bubble" forming is very low (i.e. one in 10868[12] or false vacuum decay may even be impossible).[13]

A paper by Coleman and De Luccia that attempted to include simple gravitational assumptions into these theories noted that if this was an accurate representation of nature, then the resulting universe "inside the bubble" in such a case would appear to be extremely unstable and would almost immediately collapse:

> In general, gravitation makes the probability of vacuum decay smaller; in the extreme case of minimal energy-density difference, it can even stabilize the false vacuum, preventing vacuum decay altogether. We believe we understand this. For the vacuum to decay, building a bubble of total energy zero must be possible. In the absence of gravitation, this is no problem, no matter how small the energy-density difference; all one has to do is make the bubble big enough, and the volume/surface ratio will do the job. In the presence of gravitation, though, the negative energy density of the true vacuum distorts geometry within the bubble with the result that, for a small enough energy density, there is no bubble with a big enough volume/surface ratio. Within the bubble, the effects of gravitation are more dramatic. The geometry of space-time within the bubble is that of anti-de Sitter space, a space much like conventional de Sitter space except that its group of symmetries is O(3, 2) rather than O(4, 1). Although this space-time is free of singularities, it is unstable under small perturbations, and inevitably suffers gravitational collapse of the same sort as the end state of a contracting Friedmann universe. The time required for the collapse of the interior universe is on the order of ... microseconds or less.

> The possibility that we are living in a false vacuum has never been a cheering one to contemplate. Vacuum decay is the ultimate ecological catastrophe; in the new vacuum there are new constants of nature; after vacuum decay, not only is life as we know it impossible, so is chemistry as we know it. Nonetheless, one could always draw stoic comfort from the possibility that perhaps over time the new vacuum would sustain if not life as we know it, at least some structures capable of knowing joy. This possibility has now been eliminated.

> The second special case is decay into a space of vanishing cosmological constant, the case that applies if we are now living in the debris of a false vacuum that decayed at some early cosmic epoch. This case presents us with less interesting physics and with fewer occasions for rhetorical excess than the preceding one. It is now the interior of the bubble that is ordinary Minkowski space ...

— Sidney Coleman and Frank De Luccia[11]

In a 2005 paper published in Nature, as part of their investigation into global catastrophic risks, MIT physicist Max Tegmark and Oxford philosopher Nick Bostrom calculate the natural risks of the destruction of the Earth at less than 1/109 per year from all natural (i.e. non-anthropogenic) events, including a transition to a lower vacuum state. They argue that due to observer selection effects, we might underestimate the chances of being destroyed by vacuum decay because any information about this event would reach us only at the instant when we too were destroyed. This is in contrast to events like risks from impacts, gamma-ray bursts, supernovae and hypernovae, the frequencies of which we have adequate direct measures.[14]

### Inflation

A number of theories suggest that cosmic inflation may be an effect of a false vacuum decaying into the true vacuum. The inflation itself may be the consequence of the Higgs field trapped in a false vacuum state[15] with Higgs self-coupling λ and its βλ function very close to zero at the planck scale.[16]: 218 A future electron-positron collider would be able to provide the precise measurements of the top quark needed for such calculations.[16]

Chaotic inflation theory suggests that the universe may be in either a false vacuum or a true vacuum state. Alan Guth, in his original proposal for cosmic inflation,[17] proposed that inflation could end through quantum mechanical bubble nucleation of the sort described above. See history of Chaotic inflation theory. It was soon understood that a homogeneous and isotropic universe could not be preserved through the violent tunneling process. This led Andrei Linde[18] and, independently, Andreas Albrecht and Paul Steinhardt,[19] to propose "new inflation" or "slow roll inflation" in which no tunnelling occurs, and the inflationary scalar field instead graphs as a gentle slope.

In 2014, researchers at the Chinese Academy of Sciences' Wuhan Institute of Physics and Mathematics gave an actual mathematical demonstration of the already existing idea that the universe could have been spontaneously created from nothing (no space, time, nor matter) by quantum fluctuations of a metastable false vacuum causing an expanding bubble of true vacuum.[20]

## Vacuum decay varieties

### Electroweak vacuum decay

Electroweak vacuum stability landscape as estimated in 2012[16] Electroweak vacuum stability landscape as estimated in 2018.[4] TRH is grand unification energy. ξ is the degree of non-minimal coupling between fundamental forces.

The stability criteria for the electroweak interaction was first formulated in 1979[21] as a function of the masses of the theoretical Higgs boson and the heaviest fermion. Discovery of the top quark in 1995 and the Higgs boson in 2012 have allowed physicists to validate the criteria against experiment, therefore since 2012 the electroweak interaction is considered as the most promising candidate for a metastable fundamental force, also known as "pseudostable fundamental force".[16] The corresponding false vacuum hypothesis is called either "electroweak vacuum instability" or "Higgs vacuum instability".[22] The present false vacuum state is called dS (de Sitter space), while tentative true vacuum is called AdS (Anti-de Sitter space).[23][24]

The diagrams show the uncertainty ranges of Higgs boson and top quark masses as oval-shaped lines. Underlying colors indicate if the electroweak vacuum state is likely to be stable, merely long-lived or completely unstable for given combination of masses.[25][26] The "electroweak vacuum decay" hypothesis was sometimes misreported as the Higgs boson "ending" the universe.[27][28][29] A 125.18±0.16 GeV/c2 [30] Higgs boson mass is likely to be on the metastable side of stable-metastable boundary (estimated in 2012 as 123.8–135.0 GeV.[16]) A definitive answer requires much more precise measurements of the top quark's pole mass,[16] however, although improved measurement precision of Higgs boson and top quark masses further reinforced the claim of physical electroweak vacuum being in the metastable state as of 2018.[4] Nonetheless, new physics beyond the Standard Model of Particle Physics could drastically change the stability landscape division lines, rendering previous stability and metastability criteria incorrect.[31][32] Reanalysis of 2016 LHC run data in 2022 has yielded a slightly lower top quark mass of 171.77±0.38 GeV, close to vacuum stability line but still in the metastable zone.[33][34]

If measurements of the Higgs boson and top quark suggest that our universe lies within a false vacuum of this kind, this would imply that the bubble's effects will propagate across the universe at nearly the speed of light from its origin in space-time.[35] A direct calculation within the Standard Model of the lifetime of our vacuum state finds that it is greater than 1065years with 95% confidence.[36]

### Other decay modes

* Decay to smaller vacuum expectation value, resulting in decrease of Casimir effect and destabilization of protons.[10]
* Decay to vacuum with larger neutrino mass (may have happened as late as few billion years ago).[7]
* Decay to vacuum with no dark energy.[8]
* Decay of the false vacuum at finite temperature[37] was first observed in ferromagnetic superfluids of ultracold atoms.[38]

## Bubble nucleation

When the false vacuum decays, the lower-energy true vacuum forms through a process known as bubble nucleation.[39][40][41][42][43][3] In this process, instanton effects cause a bubble containing the true vacuum to appear. The walls of the bubble (or domain walls) have a positive surface tension, as energy is expended as the fields roll over the potential barrier to the true vacuum. The former tends as the cube of the bubble's radius while the latter is proportional to the square of its radius, so there is a critical size Rc at which the total energy of the bubble is zero; smaller bubbles tend to shrink, while larger bubbles tend to grow. To be able to nucleate, the bubble must overcome an energy barrier of height[3]

Φc=3γ4R2−ΔΦ,

|
|

(Eq. 1)

where ΔΦ is the difference in energy between the true and false vacuums, γ is the unknown (possibly extremely large) surface tension of the domain wall, and R is the radius of the bubble. Rewriting Eq. 1 gives the critical radius as

Rc=3γ4ΔΦ.

|
|

(Eq. 2)

A bubble smaller than the critical size can overcome the potential barrier via quantum tunnelling of instantons to lower energy states. For a large potential barrier, the tunneling rate per unit volume of space is given by[44]

ω≈1γ2Φcℏe−Φc/ℏ,

|
|

(Eq. 3)

where ℏ is the reduced Planck constant. As soon as a bubble of lower-energy vacuum grows beyond the critical radius defined by Eq. 2, the bubble's wall will begin to accelerate outward. Due to the typically large difference in energy between the false and true vacuums, the speed of the wall approaches the speed of light extremely quickly. The bubble does not produce any gravitational effects because the negative energy density of the bubble interior is cancelled out by the positive kinetic energy of the wall.[11]

Small bubbles of true vacuum can be inflated to critical size by providing energy,[45] although required energy densities are several orders of magnitude larger than what is attained in any natural or artificial process.[10] It is also thought that certain environments can catalyze bubble formation by lowering the potential barrier.[46]

Bubble wall has a finite thickness, depending on ratio between energy barrier and energy gain obtained by creating true vacuum. In the case when potential barrier height between true and false vacua is much smaller than energy difference between vacua, shell thickness become comparable with critical radius.[47]

### Nucleation seeds

In general, gravity is believed to stabilize a false vacuum state,[48] at least for transition from dS (de Sitter space) to AdS (Anti-de Sitter space),[49] while topological defects including cosmic strings[50] and magnetic monopoles may enhance decay probability.[10]

#### Black holes as nucleation seeds

In a study in 2015,[46] it was pointed out that the vacuum decay rate could be vastly increased in the vicinity of black holes, which would serve as a nucleation seed.[51] According to this study, a potentially catastrophic vacuum decay could be triggered at any time by primordial black holes, should they exist. However, the authors note that if primordial black holes cause a false vacuum collapse, then it should have happened long before humans evolved on Earth. A subsequent study in 2017 indicated that the bubble would collapse into a primordial black hole rather than originate from it, either by ordinary collapse or by bending space in such a way that it breaks off into a new universe.[52] In 2019, it was found that although small non-spinning black holes may increase true vacuum nucleation rate, rapidly spinning black holes will stabilize false vacuums to decay rates lower than expected for flat space-time.[53][54]

If particle collisions produce mini black holes, then energetic collisions such as the ones produced in the Large Hadron Collider (LHC) could trigger such a vacuum decay event, a scenario that has attracted the attention of the news media. It is likely to be unrealistic, because if such mini black holes can be created in collisions, they would also be created in the much more energetic collisions of cosmic radiation particles with planetary surfaces or during the early life of the universe as tentative primordial black holes.[55] Hut and Rees[56] note that, because cosmic ray collisions have been observed at much higher energies than those produced in terrestrial particle accelerators, these experiments should not, at least for the foreseeable future, pose a threat to our current vacuum. Particle accelerators have reached energies of only approximately eight tera electron volts (8×1012 eV). Cosmic ray collisions have been observed at and beyond energies of 5×1019 eV, six million times more powerful – the so-called Greisen–Zatsepin–Kuzmin limit – and cosmic rays in vicinity of origin may be more powerful yet. John Leslie has argued[57] that if present trends continue, particle accelerators will exceed the energy given off in naturally occurring cosmic ray collisions by the year 2150. Fears of this kind were raised by critics of both the Relativistic Heavy Ion Collider and the Large Hadron Collider at the time of their respective proposal, and determined to be unfounded by scientific inquiry.

In a 2021 paper by Rostislav Konoplich and others, it was postulated that the area between a pair of large black holes on the verge of colliding could provide the conditions to create bubbles of "true vacuum". Intersecting surfaces between these bubbles could then become infinitely dense and form micro-black holes. These would in turn evaporate by emitting Hawking radiation in the 10 milliseconds or so before the larger black holes collided and devoured any bubbles or micro-black holes in their way. The theory could be tested by looking for the Hawking radiation emitted just before the black holes merge.[58][59]

## Bubble propagation

A bubble wall, propagating outward at nearly the speed of light, has a finite thickness, depending on the ratio between the energy barrier and the energy gain obtained by creating true vacuum. In the case when the potential barrier height between true and false vacua is much smaller than the energy difference between vacua, the bubble wall thickness becomes comparable to the critical radius.[47]

Elementary particles entering the wall will likely decay to other particles or black holes. If all decay paths lead to very massive particles, the energy barrier of such a decay may result in a stable bubble of false vacuum (also known as a Fermi ball) enclosing the false-vacuum particle instead of immediate decay. Multi-particle objects can be stabilized as Q-balls, although these objects will eventually collide and decay either into black holes or true-vacuum particles.[60]

## False vacuum decay in fiction

The hypothesis of a false vacuum decay event is occasionally deployed as a plot device in works picturing a doomsday event.

* 1980 by Jack L. Chalker in his science-fiction novel The Return of Nathan Brazil, the fourth book in the Well of Souls series (although not named as such in the novel).
* 1988 by Geoffrey A. Landis in his science-fiction short story Vacuum States[61]
* 2000 by Stephen Baxter in his science fiction novel Time[62]
* 2002 by Greg Egan in his science fiction novel Schild's Ladder
* 2002 by Liu Cixin in his science fiction short story Heard It in the Morning
* 2008 by Koji Suzuki in his science fiction novel Edge
* 2015 by Alastair Reynolds in his science fiction novel Poseidon's Wake
* 2018 by System Erasure in their video game ZeroRanger
* 2020 by Phillip P. Peterson in his science fiction novel Vakuum

## See also

* Astronomy:Eternal inflation - Hypothetical inflationary universe model
* Physics:Supercooling
* Physics:Superheating
* Astronomy:Quantum cosmology - Attempts to develop a quantum mechanical theory of cosmology
* Physics:Bubble of nothing - Mathematical instability in string theory

## References

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41. ↑ Stone, M. (1977). "Semiclassical methods for unstable states". Phys. Lett. B 67 (2): 186–188. doi:10.1016/0370-2693(77)90099-5. Bibcode: 1977PhLB...67..186S.
42. ↑ Frampton, P. H. (1977). "Consequences of Vacuum Instability in Quantum Field Theory". Physical Review D 15 (10): 2922–28. doi:10.1103/PhysRevD.15.2922. Bibcode: 1977PhRvD..15.2922F.
43. ↑ Coleman, S. (1977). "Fate of the false vacuum: Semiclassical theory". Physical Review D 15 (10): 2929–36. doi:10.1103/physrevd.15.2929. Bibcode: 1977PhRvD..15.2929C.
44. ↑ Ai, Wenyuan (2019). "Aspects of False Vacuum Decay". http://mediatum.ub.tum.de/doc/1480995/1480995.pdf.
45. ↑ Arnold, Peter (1992). "A Review of the Instability of Hot Electroweak Theory and its Bounds on mh and mt". arXiv:hep-ph/9212303.
46. ↑ 46.0 46.1 Burda, Philipp; Gregory, Ruth; Moss, Ian G. (2015). "Vacuum metastability with black holes". Journal of High Energy Physics 2015 (8): 114. doi:10.1007/JHEP08(2015)114. ISSN 1029-8479. Bibcode: 2015JHEP...08..114B.
47. ↑ 47.0 47.1 Mukhanov, V. F.; Sorin, A. S. (2022), "Instantons: Thick-wall approximation", Journal of High Energy Physics 2022 (7): 147, doi:10.1007/JHEP07(2022)147, Bibcode: 2022JHEP...07..147M
48. ↑ Devoto, Federica; Devoto, Simone; Di Luzio, Luca; Ridolfi, Giovanni (2022), "False vacuum decay: An introductory review", Journal of Physics G: Nuclear and Particle Physics 49 (10): 83, doi:10.1088/1361-6471/ac7f24, Bibcode: 2022JPhG...49j3001D
49. ↑ Espinosa, J. R.; Fortin, J.-F.; Huertas, J. (2021), "Exactly solvable vacuum decays with gravity", Physical Review D 104 (6): 20, doi:10.1103/PhysRevD.104.065007, Bibcode: 2021PhRvD.104f5007E
50. ↑ Firouzjahi, Hassan; Karami, Asieh; Rostami, Tahereh (2020). "Vacuum decay in the presence of a cosmic string". Physical Review D 101 (10). doi:10.1103/PhysRevD.101.104036. Bibcode: 2020PhRvD.101j4036F.
51. ↑ "Could Black Holes Destroy the Universe?". 2015-04-02. https://medium.com/starts-with-a-bang/could-black-holes-destroy-the-universe-de8a3135856f.
52. ↑ Deng, Heling; Vilenkin, Alexander (2017). "Primordial black hole formation by vacuum bubbles". Journal of Cosmology and Astroparticle Physics 2017 (12): 044. doi:10.1088/1475-7516/2017/12/044. Bibcode: 2017JCAP...12..044D.
53. ↑ Oshita, Naritaka; Ueda, Kazushige; Yamaguchi, Masahide (2020). "Vacuum decays around spinning black holes". Journal of High Energy Physics 2020 (1): 015. doi:10.1007/JHEP01(2020)015. Bibcode: 2020JHEP...01..015O.
54. ↑ Saito, Daiki; Yoo, Chul-Moon (2023), "Stationary vacuum bubble in a Kerr–de Sitter spacetime", Physical Review D 107 (6), doi:10.1103/PhysRevD.107.064043, Bibcode: 2023PhRvD.107f4043S
55. ↑ Cho, Adrian (2015-08-03). "Tiny black holes could trigger collapse of universe—except that they don't". https://www.science.org/content/article/tiny-black-holes-could-trigger-collapse-universe-except-they-dont.
56. ↑ Hut, P.; Rees, M. J. (1983). "How stable is our vacuum?". Nature 302 (5908): 508–509. doi:10.1038/302508a0. Bibcode: 1983Natur.302..508H.
57. ↑ Leslie, John (1998). The End of the World:The Science and Ethics of Human Extinction. Routledge. ISBN 978-0-415-14043-0.
58. ↑ Crane, Leah (26 November 2021). "Merging black holes may create bubbles that could swallow the universe" (in en-US). https://www.newscientist.com/article/2298989-merging-black-holes-may-create-bubbles-that-could-swallow-the-universe/.
59. ↑ Chitishvili, Mariam; Gogberashvili, Merab; Konoplich, Rostislav; Sakharov, Alexander S. (2023). "Higgs Field-Induced Triboluminescence in Binary Black Hole Mergers". Universe 9 (7): 301. doi:10.3390/universe9070301. Bibcode: 2023Univ....9..301C.
60. ↑ Kawana, Kiyoharu; Lu, Philip; Xie, Ke-Pan (2022), "First-order phase transition and fate of false vacuum remnants", Journal of Cosmology and Astroparticle Physics 2022 (10): 030, doi:10.1088/1475-7516/2022/10/030, Bibcode: 2022JCAP...10..030K
61. ↑ Landis, Geoffrey A. (1988). "Vacuum States". Isaac Asimov's Science Fiction: July.
62. ↑ Baxter, Stephen (2000). Time. Macmillan. ISBN 978-0-7653-1238-9. https://archive.org/details/agesinchaosjames0000unse.

## Further reading

* Rafelski, Johann; Müller, Berndt (1985). The Structured Vacuum: Thinking about Nothing. Thun: H. Deutsch. ISBN 978-3-87144-889-8.
* Coleman, Sidney (1988). Aspects of Symmetry: Selected Erice Lectures. Cambridge: Cambridge University Press. ISBN 978-0-521-31827-3. https://books.google.com/books?id=PX2Al8LE9FkC.

## External links

* on GitHub calculates the Euclidean action for the bounce solution that contributes to the false vacuum decay.
* Rafelski, Johann; Müller, Berndt (1985). The Structured Vacuum – thinking about nothing. H. Deutsch. ISBN 3-87144-889-3. http://www.physics.arizona.edu/~rafelski/Books/StructVacuumE.pdf.
* Guth, Alan. "An eternity of bubbles?". http://www.pbs.org/wnet/hawking/mysteries/html/uns_guth_1.html.

* Odenwald, Sten (1983). "The Decay of the False Vacuum". https://sten.astronomycafe.net/falsevacuum/.

* Simulation of False Vacuum Decay by Bubble Nucleation on YouTube – Joel Thorarinson.

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