Jean-Pierre Petit

Jean-Pierre Petit (b. 5 April 1937) is a French scientist, senior researcher at National Center for Scientific Research (CNRS), now retired. His main working fields are fluid mechanics, kinetic theory of gases, plasma physics, magnetohydrodynamics power generation and propulsion, astrophysics and topology. He is the author of comic books aimed at explaining popular science to children and other people without scientific background. Petit is also known in ufology because he claims a true scientific study of the UFO phenomenon would improve our scientific knowledge. However his thoughts published in books and media about extraterrestrial presence on Earth and its consequences are rejected by most of the scientific community.

= Professional work =

Jean-Pierre Petit obtained his Engineer's degree in 1961 at the French aeronautical engineering school ENSAE (Supaero). In the 1960s he worked for several months in a French rocket engine test facility as a test engineer in the development of the first nuclear intercontinental missiles SLBM. Because he felt uncomfortable within the military R&D, he preferred to integrate civilian research. In 1965 he was hired by the "Marseille Institute of Fluid Mechanics" (IMFM), a French laboratory affiliated with CNRS and the French atomic agency CEA, as a research engineer where he made his first studies in magnetohydrodynamics (MHD). In 1972 he fully incorporated the CNRS after his EngD thesis defense. In 1974 he officially stopped experimental research in MHD and started working at the Marseille Observatory where he reconverted himself in fundamental research as an astrophysicist. However, he personally carried on his experimental research on MHD propulsion until 1987. Convalescent after many months of hospitalization following an industrial injury, he became between 1977 and 1983 codirector of the "Calculation Center" at the French University of Provence where he developed with students some CAD softwares marketed in 1978. He retired from CNRS in April 2003 but keeps working. In 2007, he founded a non-profit organization to concretize some research ideas he could not experiment on while working due to lack of allocated funds at the time.

Plasma physics and magnetohydrodynamics (MHD)

Petit is a pioneer in magnetohydrodynamics involving fluid mechanics, plasma physics and electromagnetism, in both MHD types:
* The well-known MHD with high magnetic Reynolds number, as the astrophysical plasma inside a star for example.
* The less-known MHD with low magnetic Reynolds number and critical Hall parameter, involving weakly ionized gases in a non-equilibrium state (i.e. where the electron temperature is higher than the gas temperature) known as "cold plasmas", which are mathematically handled with dyadic tensors in a 7-dimensional phase space. But these non-thermal plasmas are also magnetized plasmas, and the combination of these attributes gives rise to the problematic electrothermal instability which compelled most engaged countries to cancel their engineering MHD programs in the early 1970s.

MHD Power generation

He started working in this field with shock tubes, acting as pulsed power MHD generators delivering several megawatts through direct conversion of supersonic hot gases into electricity, a device invented by Bert Zauderer and Jack Kerrebrock. In 1967, he presented the first experimental results of electrical power generation in a pulsed non-equilibrium high-Hall parameter MHD generator, producing two megawatts of electric power within a magnetic field of 2 teslas in a volume the size of a beer bottle, constituting the first step to cool down the gas in order to protect materials from heat, by controlling the electrothermal instability within MHD converters. [cite journal
author = J.P. Petit
coauthor = J. Valensi
date = September 1, 1969
title = Growth rate of electrothermal instability and critical Hall parameter in closed-cycle MHD generators when the electron mobility is variable
journal = Comptes rendus de l'académie des Sciences
publisher = French Academy of Sciences
location = Paris
issue = 269
pages = 365–367]

In 1972 he defended in front of Evry Schatzman his Doctor of Engineering thesis:cite paper
author = J.P. Petit
title = Applications of the kinetic theory of gases to plasma physics and galactic dynamics
publisher = Doctor of Engineering thesis, Aix-Marseille University, France
date = 1972]
* The first part presents the basis for the first kinetic theory of non-equilibrium plasmas, starting from the Chapman-Enskog method for the transport phenomena and extending it to a biparametric expansion in series. This work is published through peer review.
* The second part is an application of the kinetic theory of gases to galactic dynamics. Through this he resumed the work of Subrahmanyan Chandrasekhar, by compacting the calculations into a matrix form.

Coanda effect and air-breathing MHD accelerators

When he was a student at Supaero, Petit studied there the first supersonic disc nozzle, which radially spits a very thin supersonic flat air jet from an annular convergent output along the surface of the device. Then the Coandă effect sucks the air flow along the bent wall, sucks down ambient air and creates a low pressure area on top of the device, inducing lift. This is how the "Aerodina Lenticulara" works,ref patent
country= US
number= 2108652
status= patent
title= Propelling device
pubdate= January 15, 1936
gdate= February 15, 1938
fdate= January 10, 1936
url = http://www.ufo-science.com/uk/downloads/pdf/US2108652.pdf] a device patented by Henri Coandă, whom Petit met in these days. He also explained Coandă's disc experiments in a popular science review. [cite paper
author = J.P. Petit
date = August 1974
title = Flying saucers R&D: The Coanda effect
journal = Science & Vie
issue = 683
pages = 68–73
url = http://www.ufo-science.com/uk/downloads/pdf/coanda_saucer.pdf
format = PDF]

In 1975, he invented new MHD converters named MHD aerodynes and published the idea in a scientific journal.cite journal
author = J.P. Petit
date = September 15, 1975
title = New MHD converters
journal = Comptes rendus de l'académie des Sciences
publisher = French Academy of Sciences
location = Paris
series = B-Physics
volume = 281
issue = 11
pages = 157–160] cite journal
author = J.P. Petit
coauthors = M. Viton
date = February 28, 1977
title = New MHD converters: induction machines
journal = Comptes-rendus de l'académie des Sciences
publisher = French Academy of Sciences
location = Paris
volume = 284
pages = 167–179
url = http://www.mhdprospects.com/pdf/CRAS1976_en.pdf
format = PDF] An MHD aerodyne is an aircraft concept with no moving part, where surrounding air is ionized (for example with microwaves), transformed into a cold plasma, then accelerated by electromagnetic fields around its external hull. It is thus an external flow MHD accelerator with ionization control (opposed to classical magnetoplasmadynamic thrusters where hot gases are electromagnetically accelerated internally, inside a rocket engine nozzle). In order to accommodate electromagnetic coils and the magnetic field lines they create in the air, the hull of MHD aerodynes must have symmetrical geometries (cylinder or sphere for example). A magnetic field as strong as possible is required to rise the acceleration efficiency. But high B-fields give a high Hall parameter β and it is well known in the engineering field of MHD power generation that high Hall effect MHD converters are preferably disk-shaped. It is the same thing with MHD accelerators, and high Hall effect MHD aerodynes must be disk-shaped, so the electric discharges in the plasma (streamers) can swirl freely around axis, for the Lorentz forces J×B to be centrifugal.

Thereby the discoidal MHD aerodyne is very similar to Coandă's Aerodina Lenticulara. Both use the Coandă effect to induce lift. The main difference is that the MHD aerodyne uses electromagnetic forces to suck and propel air around the device, instead of mechanical means. It is an "electromagnetic Coanda disk". Admittedly the idea of discoidal aircrafts with silent MHD propulsion had been suggested before, but it had never been published in academic journals nor experimented hitherto. However Leik Myrabo later popularized this idea in the USA with his microwave-powered Lightcraft project using an external flow-control MHD accelerator: Myrabo first talked about an "externally-excited-field MHD accelerator" in 1976, cite paper
author = L.N. Myrabo
authorlink = Leik Myrabo
date = 1976
title = MHD propulsion by absorption of laser radiation
journal = Journal of spacecraft and rockets
volume = 13
issue = 8
url = http://www.aiaa.org/content.cfm?pageid=406&gTable=japaperimportPre97&gID=27919] but could experiment his annular "MHD Slipstream Accelerator" prototype for the first time at Rensselaer Polytechnic Institute in 1999.cite conference
author = L.N. Myrabo
coauthors = J.M. Kerl "et al."
date = June 20–24, 1999
title = MHD slipstream accelerator investigation in the RPI hypersonic shock tunnel
conference = 35th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit
booktitle = AIAA-1999-2842
publisher =
location = Los Angeles, CA, USA
pages =
url = http://www.aiaa.org/content.cfm?pageid=406&gTable=mtgpaper&gID=2016]

MHD flow control and supersonic flight without shock wave

Petit calculates MHD forces, creating a partial vacuum area on front or on top of the device, would be powerful enough to evacuate incoming upstream molecules at supersonic speed before they accumulate at the stationary point, preventing the shock waves, thus controlling sound and heat barriers. MHD acceleration can indeed be very powerful, even more than chemical propulsion, because the acceleration efficiency grows like the magnetic field strength and is not limited by propellant's inertia as in chemical propulsion. For example a pulsed small MHD accelerator can accelerate a ionized gas over 5,000 meters per second with only 10-centimeter electrodes and a moderate 2-Tesla magnetic field, as shown at IMFM in 1970.cite journal
author = B. Forestier
coauthors = B. Fontaine, P. Bournot and P. Parraud
date = July 20, 1970
title = Study of the variations in the aerodynamic flow parameters of ionized argon subjected to Laplacian accelerating forces
journal = Comptes-rendus de l'académie des Sciences
publisher = French Academy of Sciences
location = Paris
series = B
volume = 271
pages = 198–201
url = http://www.osti.gov/energycitations/product.biblio.jsp?query_id=0&page=0&osti_id=4115599
accessdate = 2001-06-03]

Petit obtained from 1975 to 1983 several positive experimental results with his MHD flow control devices:
* In hydraulics: MHD parietal accelerator experiments and bow wave cancellation by Lorentz forces around a cylinder embedded in an acidulated water flow. This work is an hydraulic analogy of shock wave cancellation in gas, allowing to consider the possibility of supersonic cruise in dense air without any sonic boom.
* In magnetized Low pressure discharges with high Hall parameter: creation of spiral currents, plasma confinement to wall and electrothermal instability cancellation by magnetic pressure gradient.

He published these results in specialized journals and conferences,cite techreport
author = J.P. Petit
title = Prospect on magnetohydrodynamics
institution = CNRS on behalf of CNES
year = 1979] cite journal
author = J.P. Petit
coauthors = M. Billiotte, M. Viton,
date = October 6, 1980
title = Spiral-current accelerators
journal = Comptes-rendus de l'académie des Sciences
publisher = French Academy of Sciences
location = Paris
series = B-Physics
volume = 291
issue = 5
pages = 129–131] cite journal
author = J.P. Petit
coauthors = M. Billiotte
date = April 27, 1981
title = Method for eliminating the Velikhov instability
journal = Comptes-rendus de l'académie des Sciences
publisher = French Academy of Sciences
location = Paris
pages = 158–161] J.P. Petit (September 1983). [http://www.mhdprospects.com/pdf/is_supersonic_flight_without_shock_wave_possible.pdf Is supersonic flight without shock wave possible?] ; [http://www.mhdprospects.com/pdf/cancellation_of_the_velikhov_instability_by_magnetic_confinment.pdf Cancellation of the Velikhov instability by magnetic confinment] ; "Spiral electric currents with high appearent Hall parameter confinment" in "8th International Conference on MHD Electrical Power Generation". "Proceedings", Moscow, Russia.]

In 1983 he summarized his research about MHD propulsion and flow control in a scientific comic book entitled "The Silence Barrier" where he popularizes these new concepts.cite book
author = J.P. Petit
title = The Silence Barrier
publisher = Belin (now freely downloadable)
series = Les Aventures d'Anselme Lanturlu, tr. "The Adventures of Archibald Higgins"
year = 1983
isbn = 270110467X
url = http://www.savoir-sans-frontieres.com/JPP/telechargeables/English/the_silence_barrier.htm
ISBN status = May be invalid - please double check]

In 1987, the student engineer Bertrand Lebrun from the French Engineering institute ENSAM defended his Doctor of Engineering thesis under the direction of Jean-Pierre Petit.cite paper
author = B. Lebrun (dir. J.P. Petit)
title = Theoretical study of shock wave annihilation around a flat wing in hot supersonic gas flow with Lorentz forces
publisher = Energetic Engineer-Doctor thesis 233, University of Poitiers; & Journal of Mechanics, France
date = 1987
url =
format = ] The subject in the mathematical calculation of shock wave cancellation around a flat wing in a supersonic gas flow, where they develop a method to solve the Navier-Stokes equations within an MHD force field by the method of characteristics. This work is published in international MHD meetings,cite conference
author = J.P. Petit
coauthors = B. Lebrun
year = 1986
month = November
title = Shock wave cancellation by Lorentz forces action around a model embedded in a supersonic flow
conference = 9th International Conference on MHD Electrical Power Generation
booktitle = Proceedings
publisher = Tsukuba, Japan ] cite conference
author = J.P. Petit
coauthors = B. Lebrun
year = 1992
month = October
title = Theoretical analysis of shock wave annihilation with MHD force field
conference = 11th International Conference on MHD Electrical Power Generation
booktitle = Proceedings
editor = Beijing, China
volume = III, Part.9- Fluid dynamics, art.4
pages = 748–753
url = http://www.mhdprospects.com/pdf/beijing_1992.pdf
format = PDF] and in peer-reviewed journals.cite journal
author = J.P. Petit
coauthors = B. Lebrun
year = 1989
title = Shock wave annihilation by MHD action in supersonic flow. Quasi one dimensional steady analysis and thermal blockage
journal = European Journal of Mechanics B/Fluids
series = B/Fluids
volume = 8
issue = 2
pages = 163–178
issn = 0997-7546] cite journal
author = J.P. Petit
coauthors = B. Lebrun
year = 1989
title = Shock wave annihilation by MHD action in supersonic flows. Two-dimensional steady non-isentropic analysis. Anti-shock criterion, and shock tube simulations for isentropic flows
journal = European Journal of Mechanics B/Fluids
series = B/Fluids
volume = 8
issue = 4
pages = 307–326]

New research

In 2007 Petit created "UFO-Science", a non-profit organization devoted to scientific study of the UFO phenomenon. Electromagnetic plasma propulsion and supersonic flight without shock wave through flow control by MHD force field are studied in a new laboratory running with private funds, called LAMBDA λ ("Laboratory for Applications of MHD in Bitemperature Discharges to Aerodynamics"). He created this concept of "Citizen Research" because he claims the Establishment represented by official scientific public administration, such as the CNRS and the CNES, failed to concretize his ideas because of military strategic implications.

Astrophysics and cosmology

Galactic dynamics

From 1972, Petit launched into theoretical research in astrophysics at Marseille Observatory. At the beginning he presented some work consecutive to his thesis about the kinetic theory of gases applied to galactic dynamics. In this work the Friedmann equations emerge from an elliptic solution of the Vlasov equation coupled with Poisson's equation. He then published a rewriting of the Newtonian cosmology, resuming a work from 1934 by Arthur Milne and William McCrea but from the point of view of his kinetic theory of non-equilibrium plasmas, which allows one to find the rotating universe model of Otto Heckmann and Engelbert Schücking.cite conference
author = J.P. Petit
year = 16–20 Septembrer, 1974
title = Proceedings
conference = International meeting on spiral glaxies dynamics
booktitle = Institut des Hautes Études Scientifiques (IHES)
publisher = Bures-sur-Yvette, France]

Variable constants cosmology

In 1988, Petit introduced the idea of variable speed of light in cosmology,cite journal
author = J.P. Petit
year = 1988
title = An interpretation of cosmological model with variable light velocity
journal = Modern Physics Letters A
volume = 3
issue = 16
pages = 1527
url = http://www.bigravitytheory.com/pdf/modern_physics_letters_a1.pdf
format = PDF
doi = 10.1142/S0217732388001823] cite journal
author = J.P. Petit
year = 1988
title = Cosmological model with variable light velocity: the interpretation of red shifts
journal = Modern Physics Letters A
volume = 3
issue = 18
pages = 1733
url = http://www.bigravitytheory.com/pdf/modern_physics_letters_a2.pdf
format = PDF
doi = 10.1142/S0217732388002099] cite journal
author = J.P. Petit
coauthors = M. Viton
year = 1989
title = Gauge cosmological model with variable light velocity: Comparizon with QSO observational data
journal = Modern Physics Letters A
volume = 4
issue = 23
pages = 2201–2210
url = http://www.bigravitytheory.com/pdf/modern_physics_letters_a3.pdf
format = PDF
doi = 10.1142/S0217732389002471] [ cite journal
title = Scale invariant cosmology
author = P. Midy, J.P. Petit
journal = Int. J. Mod. Phys. D
issue = 8
year = 1989
pages = 271–280
url = http://www.bigravitytheory.com/pdf/scale_inv.pdf
format = PDF] along with the joint variations of all physical constants combined to space and time scale factors changes, so that all equations and measurements of these constants remain unchanged through the evolution of the universe. The Einstein field equation remains invariant through convenient joint variations of "c" and "G" in Einstein's constant. The invariances requirement of Schrödinger and Maxwell's equations fulfill the set of gauge joint variations laws of the constants. The fine-structure constant becomes an absolute constant. Late-model restricts the variation of constants to the relativistic Radiation-Dominated Era of the early universe, where spacetime is identified to space-entropy with a conformally flat metric.cite conference
author = J.P. Petit
coauthors = P. Midy, F. Landsheat
year = 2001
month = June
title = Twin matter against dark matter
conference = International Meeting on Atrophysics and Cosmology
booktitle = "Where is the matter?"
url = http://www.bigravitytheory.com/pdf/where_is_the_matter_2001.pdf
format = PDF] cite paper
author = J.P. Petit
coauthors = G. d'Agostini
year = 2007
title = Bigravity: a bimetric model of the Universe with variable constants, including VSL (variable speed of light)
publisher = CITV, tr. "International Meeting on Variational Techniques"arxiv|id=0803.1362]

Bigravity cosmological model (Twin universe theory)

From 1977, Petit started to build an atypical cosmological model, nowadays called the bigravity theory but formerly known as the "twin universe theory", completed over the years. This model proposes a radically different vision for the universe, in opposition with the standard cosmology, but shares similarities with a model published before by Andrei Sakharov.cite book
author = A.D. Sakharov
authorlink = Andrei Sakharov
title = Collected Scientific Works
publisher = Marcel Dekker
year = 1982
isbn = 0824717147 ] In the bigravity theory, there is not only one universe, but two parallel universes with two conjugated Riemannian metrics having their own geodesics, interacting through gravitation. Whereas Petit claims his theory explains various observational facts that the standard model cannot answer, and despite several publications through peer review, this model has not triggered much interest in the cosmological community throughout the years. However, in August 2007 Petit incorporated an international club of high-level geometers who take interest in his model and validate his work from its mathematical ground.The CITV (Colloque International sur les Techniques Variationnelles, in English "International Meeting on Variational Techniques") is the annual international meeting of a selective restricted group originally created by Jean-Marie Souriau in 1950, made of specialized mathematicians and geometers working in the field of mathematical physics through functional analysis, strongly linking theories and observations with falsifiability.]

Popular science

The general public have known of Petit from the 1970s, from his series of "scientific comic books" published in France as "Les Aventures d'Anselme Lanturlu" in French (The Adventures of Anselme Lanturlu), depicting a young character who explains hard scientific concepts with easy popular meaning and simple analogies. Petit consequently created a non-profit organization named "Savoir-sans-frontières" in French (Knowledge without borders) to remunerate people all over the world for translation of these books into all available languages. In English for example, the collection is known as "The Adventures of Archibald Higgins". These educational books are freely available to download as PDF files from the organization's web site.

= Claims and controversies =

Petit is known to the general public through his popular science publications (books and comics) and by his appearances in French media, mostly about the UFO phenomenon. He is indeed favorable to the extraterrestrial hypothesis explaining some UFO cases, and the conspiracy theory about a cover-up from the armed forces to take a decisive technological, thus strategic advantage over other nations. He loudly denounces the tight relationship between the army and scientists since the Manhattan Project, which has created according to him a powerful military R&D leading to futuristic weapons of mass destruction and unmoral crowd and riot control technologies, to the exclusive use of the military-industrial complex. He also gives credit to 9/11 conspiracy theories through his web site. He thinks that global warming and geopolitics evolution caused by the unconsciousness of world political leaders will create fatal irrevocable disorders in the near future. According to him, becoming aware that we are not alone in the universe and that we are visited by people having a better technology than ours is the last chance for mankind. Such unconventional opinions has raised various enmities against him.

Ummo case and ufology

In the 1990s he published several books about ufology and the Ummo case,cite book
author = J.P. Petit
title = Enquête sur les OVNI
publisher = Albin Michel
date = May 31, 1990
language = French, tr. "Research on UFOs"
isbn = 2226041206
ISBN status = May be invalid - please double check] cite book
author = J.P. Petit
title = Enquête sur des extra-terrestres qui sont déjà parmi nous
publisher = Albin Michel
date = September 5, 1991
language = French, tr. "Investigation on aliens among us"
isbn = 2226055150] cite book
author = J.P. Petit
title = Le Mystère des Ummites
publisher = Albin Michel
date = September 7, 1995
language = French, tr. "The Ummo Mystery"
isbn = 2226078452
ISBN status = May be invalid - please double check] cite book
author = J.P. Petit
title = L'année du contact
publisher = Albin Michel
date = April 1, 2004
language = French, tr. "The year of the contact"
isbn = 2226151362
ISBN status = May be invalid - please double check] from which he would have studied documents since 1974. He pretended to have found there useful inspiration for some of his work about MHD propulsion and cosmology. Thereafter those unidentified correspondents even sent mail to him for a while, where he would have again, according to him, found other starting points for additional research developments. His hierarchy does not welcome these books.

American secret weapons

After an international conference on advanced propulsion, ["International Workshop in Field Propulsion", 1st, University of Sussex, Brighton, UK, January 2001.] Petit wrote a book, where he proclaims a leading edge science would have secretly emerged inside the US black projects sanctuaries, involving intensive study of aerial plasma propulsion with electromagnetic flow controlcite book
author = J.P. Petit
title = OVNIS et armes secrètes américaines
publisher = Albin Michel
date = January 9, 2003
language = French, tr. "UFOs and American secret weapons"
isbn = 2226136169] . He suggested such an acceleration of these technological programs would have been undertaken after military forces of the United States would had the proof of existence of intelligent extraterrestrial life forms visiting Earth in the 1940s, in particular with the so-called Roswell UFO crash which he thinks was real.

Using his knowledge about plasma physics and magnetohydrodynamics, Petit describes a model of hypersonic plane working with an MHD bypass system, pretending it would correspond to the mythic Aurora secret spyplane US Air Force would have brought into service in the 1990s. He gave several lectures on this subject, especially at the French aeronautical engineering school ENSAE where his object lesson was not criticized. Conversely, detractors of this idea never provided any technical argument in support of their denials.

Petit also envisages that the US Army would have accidentally discovered how to generate antimatter through superdense states of matter by the use of magnetically focused underground thermonuclear explosions of several megatons. Some antimatter bombs would have been created, but too powerful to be tested on Earth they would have been camouflaged into what was known as the comet Shoemaker-Levy 9, then detonated on Jupiter. Most of his colleagues judge this story as fancy.

Aneutronic fusion energy vs pure fusion bombs

After the breakthrough made by Sandia National Laboratories at the end of 2005 where researchers generated more than 3 billion degrees within the MHD compressor Z machine, [cite journal
author = M.G. Haines "et al."
year = 2006
month = February
title = Ion Viscous Heating in a Magnetohydrodynamically Unstable Z Pinch at Over 2×10⁹ Kelvin
journal = Physical Review Letters
issue = 96
url = http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000096000007075003000001&idtype=cvips&gifs=yes
doi = 10.1103/PhysRevLett.96.075003
volume = 96
pages = 075003] [cite paper
author = J.P. Petit
date = June 25, 2006
title = The Z machine: Over two billion Kelvin! - Analysis of Malcolm Haines' paper
url = http://www.mhdprospects.com/pdf/comments_on_haines_paper.pdf
format = PDF] he tries to draw the attention of scientists, politicians, ecologists and the public to what he presents as a possible future clean nuclear civilian energy, thanks to aneutronic nuclear fusion reactions with none or very few radioactive waste. But again this technology is potentially proliferating and Petit claims it could also lead to new pure fusion weapons, where the central fission A-bomb used classically for ignition of the H-bomb would be useless, replaced by a fast electric pulsed power detonator (a compact z-pinch fed with some explosively pumped flux compression generator).

= See also =

* Plasma physics
* Magnetohydrodynamics
* MHD generator
* Magnetohydrodynamic drive
* Magnetoplasmadynamic thruster
* Variable speed of light
* Parallel universe
* Ummo
* Z machine

= External links =

* [http://www.jp-petit.org Jean-Pierre Petit's personal web site] (mostly in French and some parts in English)
* [http://www.mhdprospects.com/ MHD Prospects] (Jean-Pierre Petit's web site dedicated to scientific papers about MHD)
* [http://www.bigravitytheory.com/ Bigravity Theory] (Jean-Pierre Petit's web site dedicated to his work in cosmology)
* [http://www.ufo-science.com UFO-Science] (MHD research and scientific investigation about the UFO phenomenon)
* [http://www.savoir-sans-frontieres.com/JPP/telechargeables/free_downloads_english.htm Savoir-sans-Frontières] ("Knowledge without borders", popular science comic books, mostly translated in English)
* [http://www.signs-of-the-times.org/articles/show/124330-Podcast%3A+A+conversation+with+Jean-Pierre+Petit Podcast: A conversation with Jean-Pierre Petit] regarding his work. [http://www.signs-of-the-times.org/signs/dl.php?link=pentagonstrike,co,uk%sott%podcast%sott_podcast_42_20060331_20kbps,mp3 Part 1] ( [http://www.signs-of-the-times.org/signs/forum/viewtopic.php?id=6215 transcript] ), [http://www.signs-of-the-times.org/signs/dl.php?link=pentagonstrike,co,uk%sott%podcast%sott_podcast_43_20060331_20kbps,mp3 Part 2] ( [http://www.signs-of-the-times.org/signs/forum/viewtopic.php?id=6268 transcript] )

= References =