Heim theory, initially proposed by the late German physicist Burkhard Heim, is an attempt to develop a theory of everything in theoretical physics. Heim attempted to resolve incompatibilities between quantum theory and general relativity. To meet that goal, he developed a mathematical approach based on quantizing spacetime.  Others have attempted to apply Heim theory to nonconventional space propulsion and faster than light concepts, as well as the origin of dark matter. 
Heim has claimed that his theory yields particle masses directly from fundamental physical constants and that the resulting masses are in agreement with experiment but this claim has not been confirmed.  Heim theory is formulated mathematically in six or more dimensions and uses Heim's own version of difference equations. It has received little attention in the scientific literature and is regarded as being outside mainstream science.  However it has attracted some interest in popular and fringe media.
- Lietz, Haiko (5 January 2006). "Take a leap into hyperspace" (Full text article available for free download.). New Scientist magazine (Reed Business Information Ltd.). Retrieved 2013-07-20. "...the idea relies on an obscure and largely unrecognized kind of physics...The majority of physicists have never heard of Heim theory, and most of those contacted by New Scientist said they couldn't make sense of Dröscher and Häuser's description of the theory behind their proposed experiment...The general consensus seems to be that Dröscher and Häuser's theory is incomplete at best...it has not passed any normal form of peer review."
- List of Publications. HPCC-Space GmbH. 2006.
- Auerbach, T., and von Ludwiger, I. (1992). "Heim’s Theory of Elementary Particle Structures". Journal of Scientific Exploration (in English) 6.3: 217–231. Retrieved 2013-07-20. "So far Heim has not succeeded in finding a criterion which would limit the number of excited states to those actually observed. Despite the insight gained into particle physics, the theory is not entirely equivalent to modem quantum theory. This enables [Heim] to derive logically precise statements about the process of life, the origin of paranormal phenomena, and the structure of realms far transcending the 4-dimensional world of our experience."
- Landis, Geoffrey A. "Heim theory (the rise and fall)". Retrieved 2013-07-20.
- Long,, Kelvin F. (2012). Deep Space Propulsion: A Roadmap to Interstellar Flight (Google Books preview) (in English). Springer Science+Business Media. pp. 295–296. ISBN 978-1-4614-0607-5.
- Citation rates and other information (July 20, 2013). "Dröscher, W.". Google Scholar. Retrieved 2013-07-20.
- Modanese, Giovanni and Robertson, Glen A. (2012). Gravity-Superconductors Interactions: Theory and Experiment (Google Books preview) (in English). Bentham Science Publishers. pp. 230–231. ISBN 978-1-60805-400-8.
- Farrell, Joseph P. (1 June 2010). Babylon's Banksters: The Alchemy of Deep Physics, High Finance and Ancient Religion. Port Townsend, WA: Feral House. pp. 110–111. ISBN 9781932595796.
- Ufos For Know-It-Alls. Filiquarian Publishing. January 14, 2008. p. 41. ISBN 9781599862323.
- Ubani, Lumumba Umunna (2011). Preventive Therapy in Complimentary Medicine: Volume I To liberate Humankind from the pain and furffering of synthetic and chemicalized medications (Google Books preview) (in English). Xlibris Corporation. pp. 611–612. ISBN 9781462876877.
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- Chronological Overview of the Research of Burkhard Heim (5 pages, English translation by John Reed, Feb 2011)
- Heim Theory Falsified. Next Big Future. 1 July 2011. This article posts John Reed's comments.
- General Discussions. Heim Theory. The Physics Forum. 2013-03-26.
- Heim Theory Translation. Borje Mansson and Anton Mueller. 2006.
- Discussion about Burkhard Heim's Particle Structure Theory. Physforum. May 2011.