Although the theory of relativity has been accepted by the scientific community for nearly a century, there are other theories proposed. This category is for sites which claim to disprove the theory of relativity, or which promote alternative theories.
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- Spacelike Tessellations of Tetrahedrons Introduces a simple quantization of space and time using tetrahedrons; significant ratios in the geometry of these objects are taken as an indication that they represent different kinds of elementary particles. By William R. Olson.
- Relativity and Gravitrons Short page claiming that it is the acceleration of energy within a particle that produces mass and consequently gravity; by Alfredo A. Barrera.
- The Spacetime Phenomena Theory of gravity based on conclusions from the equivalence principle: The gravitational force is caused by the change of speed of spacetime structure, falling into a mass. By F. Stefanko.
- Measuring Time and Other Spatio-Temporal Quantities Introduces a "space-time odometer" that, using the cosmic microwave background radiation, measures both common sense time and spatial distances - resulting in the kind of "absolute" measurements whose existence is denied by relativity; by Hartmut Traunmüller.
- Extinction Shift Principle (c) Presents the principal axioms of the "extinction shift principle", a purely classical photon-gravity theory of emissions/re-emissions of electromagnetism and gravitation intended as an alternative to both general and special relativity. By Edward Henry Dowdye, Jr.
- Warp Drive Today Website explaining the physics of the Alcubierre Warp Drive, presented in a science-fiction-like format. Includes a discussion of problems and future prospects; by Edward Halerewicz, Jr.
- Physics, Relativity, Gravitation and Cosmology: New Theories and Mathematical Formulations Presentation of a new mathematical formulation for both the Special and General Theories of Relativity, a new theory of Atomic Structure, Gravitation, and the origin and existence of the Universe. By Peter Bass.
- Relativity or Ether Theory with a new Propagation of Light A new analysis of the Michelson Experiment.
- Apparent Lack of Symmetry in Stellar Aberration and Euclidean Space Time Critical examination of stellar aberration and its relativistic interpretation, followed by the author's alternative derivation based on Euclidean spacetime; by Rajan Dogra.
- Millennium Relativity Introduces a new theory in relativistic physics to replace Einstein's special and general theories of relativity. Also includes the Millennium Theory of Inertia and Gravity, and a text on breaking the light speed barrier. By Joseph A. Rybczyk.
- The Inertial Mass Presents fragments of the book "The Inertial Mass" published in June 1998, authored by D. Acosta: "a model that is able to explain the mass in its inertial aspect (not gravitational)".
- Einstein's Equivalence Postulate and Spacelike Waves Essay by James Constant arguing how Einstein's equivalence postulate should be abandoned for the study of spacelike wave phenomena and gravitation. Contains links to other essays by the author, notably about Newton's Gravitation and its relation to Riemannian geometry and to cosmology.
- Euclidean Relativity Texts describing a particular Euclidean interpretation of special relativity, including a proposed geometric unification of electromagnetism and gravity (in five dimensions), information on Euclidean versus Minkowski four-vectors, and a sketch of the Universe as a multi-dimensional fractal; by R.F.J. van Linden.
- From Paradox to Paradigm Alternative to relativity based on a dragged ether. Includes an exposition on the equivalence of magnetic and kinetic energy and the derivation of Planck's constant from quantum mechanics and the ether. Translation from a book in Dutch by Johan Bakker.
- Anti-Relativity Website presenting what the author claims to be experimental evidence against relativity, as well as more philosophical arguments and proposed explanations of the various experimental effects in terms of an ether theory. Includes a discussion board.
- Mass Theory and Triangle of Velocities Elementary Concepts of Material World (the attempt to "explain fundamental laws of nature with use of precise and clear logic only") and criticism of the Lorentz transformations; by Aleksandar Vukelja.
- A Concept of Space and Time Essay by Robert Brison about how what we perceive as time and space ("tise") evolved from a single quantized entity in nature ("tisons"). Briefly discusses implications for special relativity, general relativity, string theory, and the fundamental structure of matter.
- Proof of the Falsity of the Special Theory of Relativity Erik J. Lange's exposition of a mathematical proof of the falsity of a popular derivation of the Lorentz transformations.
- Quantum Pulse Theory Introduces a new unit of energy which, together with a geometric construction for matter waves, is used to derive a quantized form of Einstein's relativistic mass-energy equation; by Brian Nelson.
- Yilmaz Refinement of Einstein Theory Presents the mythology of modern astronomy, as well as the gravitational theory of Huseyin Yilmaz, which eliminates black holes, the big bang, singularities, as well as the need for dark energy and dark matter; by Adrian Bjornson.
- Gravitational Mirror Theory Introducing a "universe much smaller than the big bang", in which the multitude of galaxies turns out to be an optical illusion; includes pages inviting the reader to consider how Einstein can be disproved using the Hubble Space Telescope.
- Newton Physics Collection of articles and online books, by Paul Marmet; topics include the death of Big Bang cosmology, how classical mechanics can explain the effects commonly attributed to relativity, how the Lorentz transformations mean that the speed of light is not the same for all inertial observers, and gravitational length contraction.
- Geometrical Structure of Nature A theory of everything and a mathematical formulation of a philosophy, from the basis of physical reality to self-organization, consciousness, and the future of the Universe; by M. Erk Durgun.
- Derivation of gravitational waves in Einstein, Brans-Dicke and Rosen theories of gravity. Link to paper (PDF) with a weak-field derivation of gravitational waves to quadrupole order in the Brans-Dicke scalar-tensor and Rosen bi-metric theories of gravity, including a comparison with general relativity. By Warren F. Davis.
- Faster Than Light versus Minkowski and Aristotle Space-Time Attempt to formulate special relativity using Aristotle space-time and interpreting the relativistic boost invariance of any phenomenon which satisfies this symmetry is interpreted as an intrinsic property of this phenomenon rather than a very property of space-time itself, the theory is shown to be compatible with causal links between space-like separated events; by Bernard Chaverondier.
- Basic doubts on relativity Lays out the authors doubts about relativity, using light propagation scenarios, reference frames, and phenomena such as aberration.
- The Imagineer’s Chronicles Blog about, among other things, alternative unified theories created using imagination and common sense. By "Imagineer" Jeff and friends.
- New Alternative Gravity Theory An alternative theory of gravity that is based on the equivalence principle. Developed by Unified Gravity Corporation, which is concerned with approaches to alternative energy.
- Autodynamics Webpages of the Society for the Advancement of Autodynamics, a theory that is meant to replace Einstein's theory of special relativity. Includes general material such as "Autodynamics in pictures", links, and information about the society.
- Trans Dimensional Unified Field Theory Based on simple multiplication of dimensional factors, this theory by George James Ducas is meant to unify relativity with quantum mechanics and string theory, explaining dark energy along the way.
- Velocity of Light Thoughts by Dane Gacesa on the way that each macroscopic light source is made up of elementary light sources, on the selective sensitivity of detectors for light emitted in this way, and the consequences for relativity.
- On New Concepts of Weight and Gravity and their Bearing on Relativity Introduces a new concept of weight which distinguishes between self-weight and acquired weight and subsequently leads to a new definition of gravity, based on the assumption that all subatomic particles have a "mass-energy field". By Elie Agur.
- Expanding Matrix Theory A physics treatise presenting a new model of spatial dynamics, based on a little known interpretation of Einstein's equivalence principle and the fundamental conclusion that all point-energy in the universe is expanding. Demonstrates how new data such as the accelerating universe, new WMAP data and Earth-Moon-Sun orbital data concurs with the theory.
- Absolute Velocities website on which the author (A. A. Faraj) works out the predictions of an emission theory of light.
- The General Science Journal Presents a variety of scientific papers by the site's author and others. Subjects include the grand unified theory, light propagation, a new formulation of mechanics and, more generally, commentary and analyses of the physics and philosophy of special relativity; by Walter Babin.
- Theories in the Foundations of Physics Defining space and time in the literal way we experience it - via particles -, the author, Keith Maxwell Hardy, creates a quantum theory of space and time, including applications to photon kinematics and quantum tunneling.
- Einstein's Theory of Relativity in New Physical Model Essay explaining the postulates of relativity, the secret essence of time, spaces, and matter, and proposing the elimination of internal contradictions of special relativity. By Alexander Poshelaev.