|This article relies on references to primary sources. (July 2013)|
Plasma cosmology is a non-standard cosmology whose central postulate is that the dynamics of ionized gases and plasmas play important if not dominant roles in the physics of the universe beyond the Solar System. Some general concepts about plasma cosmology have been attributed to Hannes Alfvén, who was awarded the 1970 Nobel prize for inventing magnetohydrodynamics (MHD). Alfvén proposed the use of plasma scaling to extrapolate the results of laboratory experiments and space plasma physics observations and scale them over many orders-of-magnitude up to the largest observable objects in the universe (see box). Plasma cosmology is rejected by astrophysicists and cosmologists because, as described by its proponents, it does not provide as well-matched an account of the observations of astrophysical and cosmological phenomena as the accepted astrophysical and cosmological theories do.
In the 1960s, the theory behind plasma cosmology was introduced by Alfvén, Oskar Klein and Carl-Gunne Fälthammar, and Alfvén's 1966 book Worlds-Antiworlds. Klein in 1971 extended Alfvén's Worlds-Antiworlds proposals and developed the "Alfvén-Klein model" of the universe, or metagalaxy, an earlier term to distinguish between the universe and the Milky Way galaxy. In this Alfvén-Klein cosmology, sometimes called Klein-Alfvén cosmology, the universe is made up of equal amounts of matter and antimatter with the boundaries between the regions of matter and antimatter being delineated by cosmic electromagnetic fields formed by double layers, being thin regions comprising two parallel layers with opposite electrical charge. Interaction between these boundary regions would generate radiation, and this would form the plasma. Alfvén introduced the term ambiplasma for a plasma made up of matter and antimatter and the double layers are thus formed of ambiplasma. According to Alfvén, such an ambiplasma would be relatively long-lived as the component particles and antiparticles would be too hot and too low-density to annihilate each other rapidly. The double layers will act to repel clouds of opposite type, but combine clouds of the same type, creating ever-larger regions of matter and antimatter. The idea of ambiplasma was developed further into the forms of heavy ambiplasma (protons-antiprotons) and light ambiplasma (electrons-positrons).
Alfvén-Klein cosmology was proposed in part to explain the observed baryon asymmetry in the universe, starting from an initial condition of exact symmetry between matter and antimatter. According to Alfvén and Klein, ambiplasma would naturally form pockets of matter and pockets of antimatter that would expand outwards as annihilation between matter and antimatter occurred in the double layer at the boundaries. They concluded that we must just happen to live in one of the pockets that was mostly baryons rather than antibaryons, explaining the baryon asymmetry. The pockets, or bubbles, of matter or antimatter would expand because of annihilations at the boundaries, which Alfvén considered as a possible explanation for the observed expansion of the universe, which would be merely a local phase of a much larger history. Alfvén postulated that the universe has always existed due to causality arguments and the rejection of ex nihilo models, such as the Big Bang, as a stealth form of creationism. The exploding double layer was also suggested by Alfvén as a possible mechanism for the generation of cosmic rays, x-ray bursts and gamma-ray bursts.
In 1993, theoretical cosmologist Jim Peebles criticized the cosmology of Klein (1971) and Alfvén's 1966 book, Worlds-Antiworlds, writing that "there is no way that the results can be consistent with the isotropy of the cosmic microwave background radiation and X-ray backgrounds". In his book he also showed that Alfvén's models do not predict Hubble's law, the abundance of light elements, or the existence of the cosmic microwave background. A further difficulty with the ambiplasma model is that matter–antimatter annihilation results in the production of high energy photons, which are not observed in the amounts predicted. While it is possible that the local "matter-dominated" cell is simply larger than the observable universe, this proposition does not lend itself to observational tests.
Plasma cosmology and the study of galaxies
Hannes Alfvén from the 1960s to 1980s argued that plasma played an important if not dominant role in the universe because electromagnetic forces are far more important than gravity when acting on interplanetary and interstellar charged particles. He further hypothesized that Birkeland currents (here meaning currents in space plasmas which are aligned with magnetic field lines) were responsible for many filamentary structures and that a galactic magnetic field and associated current sheet, with an estimated galactic current of 1017 to 1019amperes, might promote the contraction of interstellar clouds and may even constitute the main mechanism for contraction, initiating star formation. The current standard view is that magnetic fields can hinder collapse, that large-scale Birkeland currents have not been observed, and that the length scale for charge neutrality is predicted to be far smaller than the relevant cosmological scales.
In the 1980s and 1990s, Alfvén and Anthony Peratt, a plasma physicist at Los Alamos National Laboratory, outlined a program they called the "plasma universe". In plasma universe proposals, various plasma physics phenomena were associated with astrophysical observations and were used to explain extant mysteries and problems outstanding in astrophysics in the 1980s and 1990s. In various venues, Peratt profiled what he characterized as an alternative viewpoint to the mainstream models applied in astrophysics and cosmology.
For example, Peratt proposed that the mainstream approach to galactic dynamics which relied on gravitational modeling of stars and gas in galaxies with the addition of dark matter was overlooking a possibly major contribution from plasma physics. He mentions laboratory experiments of Winston H. Bostick in the 1950s that created plasma discharges that looked like galaxies. Perrat conducted computer simulations of colliding plasma clouds that he reported also mimicked the shape of galaxies. Peratt proposed that galaxies formed due to plasma filaments joining in a z-pinch, the filaments starting 300,000 light years apart and carrying Birkeland currents of 1018 Amps. Peratt also reported simulations he did showing emerging jets of material from the central buffer region that he compared to quasars and active galactic nuclei occurring without supermassive black holes. Peratt proposed a sequence for galaxy evolution: "the transition of double radio galaxies to radioquasars to radioquiet QSO's to peculiar and Seyfert galaxies, finally ending in spiral galaxies". He also reported that flat galaxy rotation curves were simulated without dark matter. At the same time Eric Lerner, an independent plasma researcher and supporter of Peratt's ideas, proposed a plasma model for quasars based on a dense plasma focus.
As an IEEE fellow of the IEEE Nuclear and Plasma Sciences Society and guest editor of the journal Transactions on Plasma Science, Peratt supported the publication of a number of special issues dedicated to plasma cosmology, the last one appearing in 2007. Additionally, in 1991, Lerner wrote a popular-level book supporting plasma cosmology titled The Big Bang Never Happened.
Comparison to mainstream astrophysics
Standard astronomical modeling and theories attempt to incorporate all known physics into descriptions and explanations of observed phenomena, with gravity playing a dominant role on the largest scales as well as in celestial mechanics and dynamics. To that end, both Keplerian orbits and Einstein's theory of general relativity are generally used as the underlying frameworks for modeling astrophysical systems and structure formation, while high-energy astronomy and particle physics in cosmology additionally appeal to electromagnetic processes including plasma physics and radiative transfer to explain relatively small scale energetic processes observed in the x-rays and gamma rays. In contrast to plasma cosmology, plasma physics is accepted as having influence on many astrophysical phenomena. Much of the matter in the universe is thought to be ionised or exist as plasma, and it is this plasma that can generate magnetic fields. (See astrophysical plasma for more.)
Proponents of plasma cosmology claim electrodynamics is as important as gravity in explaining the structure of the universe, and speculate that it provides an alternative explanation for the evolution of galaxies and the initial collapse of interstellar clouds. In particular plasma cosmology is claimed to provide an alternative explanation for the flat rotation curves of spiral galaxies and to do away with the need for dark matter in galaxies and with the need for supermassive black holes in galaxy centres to power quasars and active galactic nuclei. However, theoretical analysis shows that "many scenarios for the generation of seed magnetic fields, which rely on the survival and sustainability of currents at early times [of the universe are disfavored]", i.e. Birkeland currents of the magnitude needed (1018 Amps over scales of megaparsecs) for galaxy formation do not exist. Additionally, many of the issues that were mysterious in the 1980s and 1990s, including discrepancies relating to the cosmic microwave background and the nature of quasars, have been solved with more evidence that, in detail, provides a distance and time scale for the universe. Plasma cosmology supporters therefore dispute the interpretations of evidence for the Big Bang, the time evolution of the cosmos, and even the expanding universe; their proposals are essentially outside anything considered even plausible in mainstream astrophysics and cosmology.
Some of the places where plasma cosmology supporters are most at odds with standard explanations include the need for their models to have light element production without Big Bang nucleosynthesis which, in the context of Alfvén-Klein cosmology, has been shown to produce excessive x-rays and gamma rays beyond that observed. Plasma cosmology proponents have made further proposals to explain light element abundances, but the attendant issues have not been fully addressed. In 1995 Eric Lerner published his alternative explanation for the cosmic microwave background radiation (CMB). He argued that his model explained the fidelity of the CMB spectrum to that of a black body and the low level of anisotropies found, even while the level of isotropy at 1:105 is not accounted for to that precision by any alternative models. Additionally, the sensitivity and resolution of the measurement of the CMB anisotropies was greatly advanced by WMAP and the Planck satellite and the statistics of the signal were so in line with the predictions of the Big Bang model, that the CMB has been heralded as a major confirmation of the Big Bang model to the detriment of alternatives. The acoustic peaks in the early universe are fit with high accuracy by the predictions of the Big Bang model, and, to date, there has never been an attempt to explain the detailed spectrum of the anisotropies within the framework of plasma cosmology or any other alternative cosmological model.
- Alfvén, Hannes:
- "Cosmic Plasma" (Reidel, 1981) ISBN 90-277-1151-8
- "On hierarchical cosmology", Astrophysics and Space Science (ISSN 0004-640X), vol. 89, no. 2, January 1983, pp. 313-324
- "Cosmology in the plasma universe", Laser and Particle Beams (ISSN 0263-0346), vol. 6, August 1988, pp. 389-398 Full text
- "Model of the plasma universe", IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. PS-14, December 1986, pp. 629-638 Full text (PDF)
- "The Plasma Universe", Physics Today (ISSN 0031-9228), vol. 39, issue 9, September 1986, pp. 22 - 27
- Peratt, Anthony:
- "Physics of the Plasma Universe", (Springer, 1992) ISBN 0-387-97575-6
- "Simulating spiral galaxies", Sky and Telescope (ISSN 0037-6604), vol. 68, August 1984, pp. 118-122
- "Are Black Holes Necessary?", Sky and Telescope (ISSN 0037-6604), vol. 66, July 1983, pp. 19-22
- "Evolution of the plasma universe. I - Double radio galaxies, quasars, and extragalactic jets", IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. PS-14, December 1986, pp. 639-660 Full text (PDF)
- "Evolution of the plasma universe. II - The formation of systems of galaxies", IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. PS-14, December 1986, pp. 763-778 Full text (PDF)
- "The role of particle beams and electrical currents in the plasma universe", Laser and Particle Beams (ISSN 0263-0346), vol. 6, August 1988, pp. 471-491 Full text (PDF)
- IEEE journal Transactions on Plasma Science: special issues on Space and Cosmic Plasma 1986, 1989, 1990, 1992, 2000, 2003, and 2007
- Cambridge University Press journal Laser and Particle Beams: Particle Beams and Basic Phenomena in the Plasma Universe, a Special Issue in Honor of the 80th Birthday of Hannes Alfvén, vol. 6, issue 3, August 1988 
- Various authors: "Introduction to Plasma Astrophysics and Cosmology", Astrophysics and Space Science, v. 227 (1995) p. 3-11. Proceedings of the Second IEEE International Workshop on Plasma Astrophysics and Cosmology, held from 10 to 12 May 1993 in Princeton, New Jersey
References and notes
- Hannes Alfvén, "On hierarchical cosmology" (1983) Astrophysics and Space Science (ISSN 0004-640X), vol. 89, no. 2, January 1983, p. 313-324.
- Anthony L. Peratt (February 1992). "Plasma Cosmology". Sky & Telescope. Retrieved 26 May 2012.
- It was described as this in the February 1992 issue of Sky & Telescope ("Plasma Cosmology"), and by Anthony Peratt in the 1980s, who describes it as a "nonstandard picture". The ΛCDM model big bang picture is typically described as the "concordance model", "standard model" or "standard paradigm" of cosmology here, and here.[unreliable source?]
- Alfven, Hannes O. G., "Cosmology in the plasma universe - an introductory exposition", IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. 18, Feb. 1990, p. 5-10.
- Helge S. Kragh, Cosmology and Controversy: The Historical Development of Two Theories of the Universe, 1996 Princeton University Press, 488 pages, ISBN 0-691-00546-X (pp.482-483)
- A. Peratt (1986). "Evolution of the Plasma Universe: II. The Formation of Systems of Galaxies". IEEE Trans. on Plasma Science. PS-14: 763–778. ISSN 0093-3813.
- H. Alfvén, O. Klein (1963). "Matter-Antimatter Annihilation and Cosmology". Arkiv Fysik 23: 187–194.
- H. Alfvén and C.-G. Falthammar (1963). Cosmic electrodynamics. Oxford: Clarendon Press.
- H. Alfvén (1966). Worlds-antiworlds: antimatter in cosmology. Freeman.
- O. Klein, "Arguments concerning relativity and cosmology," Science 171 (1971), 339
- Hannes Alfvén, "Has the Universe an Origin" (1988) Trita-EPP, 1988, 07, p. 6.
- Anthony L. Peratt, "Introduction to Plasma Astrophysics and Cosmology" (1995) Astrophysics and Space Science, v. 227, p. 3-11: "issues now a hundred years old were debated including plasma cosmology's traditional refusal to claim any knowledge about an 'origin' of the universe (e.g., Alfvén, 1988)"
- Alfvén, Hannes, "Cosmology: Myth or Science?" (1992) IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. 20, no. 6, p. 590-600
- Alfvén, H. (March 1984). "Cosmology - Myth or science?". Journal of Astrophysics and Astronomy 5: 79–98. Bibcode:1984JApA....5...79A. doi:10.1007/BF02714974. ISSN 0250-6335.
- Hannes Alfvén, Cosmic plasma. Taylor & Francis US, 1981,IV.10.3.2, p.109. "Double layers may also produce extremely high energies. This is known to take place in solar flares, where they generate solar cosmic rays up to 109 to 1010 eV."
- Alfvén, H., "Double layers and circuits in astrophysics", (1986) IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. PS-14, Dec. 1986, p. 779-793. Based on the NASA sponsored conference "Double Layers in Astrophysics" (1986)
- P. J. E. Peebles, Principles of Physical Cosmology, (1993) Princeton University Press, p. 207, ISBN 978-0-691-07428-3
- H. Alfvén and C.-G. Falthammar, Cosmic electrodynamics(2nd edition, Clarendon press, Oxford, 1963). "The basic reason why electromagnetic phenomena are so important in cosmical physics is that there exist celestial magnetic fields which affect the motion of charged particles in space ... The strength of the interplanetary magnetic field is of the order of 10-4 gauss (10 nanoteslas), which gives the [ratio of the magnetic force to the force of gravity] ≈ 107. This illustrates the enormous importance of interplanetary and interstellar magnetic fields, compared to gravitation, as long as the matter is ionized." (p.2-3)
- Alfvén, H.; Carlqvist, P., "Interstellar clouds and the formation of stars"Astrophysics and Space Science, vol. 55, no. 2, May 1978, p. 487-509.
- Siegel, E. R.; Fry, J. N. (Sept 2006). "Can Electric Charges and Currents Survive in an Inhomogeneous Universe?". arXiv.
- H. Alfvén, Model of the Plasma Universe, IEEE Trans. Plasma Sci. Vol PS-14, 1986. 
- A. L. Peratt, Plasma Cosmology: Part I, Interpretations of a Visible Universe, World & I, vol. 8, pp. 294-301, August 1989. 
- A. L. Peratt, Plasma Cosmology:Part II, The Universe is a Sea of Electrically Charged Particles, World & I, vol. 9, pp. 306-317, September 1989 .
- A.L. Peratt, Plasma Cosmology, Sky & Tel. Feb. 1992. 
- A. L. Peratt, Introduction to Plasma Astrophysics and Cosmology, Astrophys. Space Sci. 227, 3-11 (1995). 
- A. Peratt (1986). "Evolution of the plasma universe. I - Double radio galaxies, quasars, and extragalactic jets". IEEE Trans. on Plasma Science. PS-14: 639–660. ISSN 0093-3813.
- Bostick, W. H., "What laboratory-produced plasma structures can contribute to the understanding of cosmic structures both large and small" (1986) IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. PS-14, Dec. 1986, p. 703-717
- AL Peratt, J Green and D Nielson (20 June 1980). "Evolution of Colliding Plasmas". Physical Review Letters 44: 1767–1770. Bibcode:1980PhRvL..44.1767P. doi:10.1103/PhysRevLett.44.1767.
- E. J. Lerner (1991). The Big Bang Never Happened. New York and Toronto: Random House. ISBN 0-8129-1853-3.
- AL Peratt and J Green (1983). "On the Evolution of Interacting, Magnetized, Galactic Plasmas". Astrophysics and Space Science 91: 19–33. Bibcode:1983Ap&SS..91...19P. doi:10.1007/BF00650210.
- E.J. Lerner (1986). "Magnetic Self‑Compression in Laboratory Plasma, Quasars and Radio Galaxies". Laser and Particle Beams. 4 part 2: 193‑222. Bibcode:1986LPB.....4..193L. doi:10.1017/S0263034600001750.
- (See IEEE Transactions on Plasma Science, issues in 1986, 1989, 1990, 1992, 2000, 2003, and 2007)
- Colafrancesco, S. and Giordano, F. The impact of magnetic field on the cluster M - T relation Astronomy and Astrophysics, Volume 454, Issue 3, August II 2006, pp. L131-L134.  recount: "Numerical simulations have shown that the wide-scale magnetic fields in massive clusters produce variations of the cluster mass at the level of ~ 5 − 10% of their unmagnetized value ... Such variations are not expected to produce strong variations in the relative [mass-temperature] relation for massive clusters."
- J.Audouze et al., "Big Bang Photosynthesis and Pregalactic Nucleosynthesis of Light Elements", Astrophysical Journal 293:L53-L57, 1985 June 15 
- Epstein et al., "The origin of deuterium", Nature, Vol. 263, September 16, 1976 point out that if proton fluxes with energies greater than 500 MeV were intense enough to produce the observed levels of deuterium, they would also produce about 1000 times more gamma rays than are observed.
- Ref. 10 in "Galactic Model of Element Formation" (Lerner, IEEE Trans. Plasma Science Vol. 17, No. 2, April 1989 ) is J.Audouze and J.Silk, "Pregalactic Synthesis of Deuterium" in Proc. ESO Workshop on "Primordial Helium", 1983, pp. 71-75  Lerner includes a paragraph on "Gamma Rays from D Production" in which he claims that the expected gamma ray level is consistent with the observations. He cites neither Audouze nor Epstein in this context, and does not explain why his result contradicts theirs.
- Eric Lerner. Intergalactic Radio Absorption and the COBE Data, Astrophysics and Space Science, 227: 61-81, 1995.
- D. N. Spergel et al. (WMAP collaboration), "First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Determination of cosmological parameters", Astrophys. J. Suppl. 148 (2003) 175.