- 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.
- Absolute Velocities - website on which the author (A. A. Faraj) works out the predictions of an emission theory of light.
- An Alternative View of the Stucture of Time - A particle-based view of special and general relativity by John K.N. Murphy.
- Anti-Relativity.com - Site offering criticism of the experimental basis of relativity as well as what the author sees as the theory's paradoxes. Includes information on the author's "Personal Aether theory conjecture", and a discussion forum.
- 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.
- Curt Renshaw's Physics Page - A collection of published and presented papers on the subject of relativity theory prepared by Curt Renshaw, including the author's radiation continuum of light, the restoration of space and time, and a look at three-dimensional Galilean invariance.
- 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.
- Eight Essays in Support of Non-Relativistic Physics - Account (PDF, 192 pages) of a search for hidden mechanisms in the physical sciences, including the propagation of light, ring models, gravity, relativity and the origin of the solar system; by the independent Research Engineer Arthur G. Gross.
- 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.
- Einstein's Theory of Relativity - Illusion or Reality? - An online book featuring a critical analysis of special relativity, from coordinate transformations to the question of antimatter and a new elementary particle called the ELPOTRIN; by electrical engineer Milan R. Pavlovic. Book is available in English as well as in Serbian.
- 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. Also shows how the energy contained in the parallel spaces proposed by the author could be used to solve the current energy crisis. rticle explains postulates of relativity, secret essence of time, spaces, matter.
- 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.
- Expanding Matrix and the Unification of Dynamics - 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; by Francis Pedley
- Extinction Shift Principle (c) - Presents the "principal axioms on the non-measurability and direct observation of primary emissions", for both gravitons and photons, "not found in the textbooks"; by Edward Henry Dowdye, Jr.
- 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.
- 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.
- General Lorentz Ether Theory - An ether theory of gravity. Starting from condensed matter theory (Lagrange formalism, continuity and Euler equation) the Einstein equivalence principle and, in some limit, the Einstein equations are derived; by Ilja Schmelzer.
- 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.
- 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.
- In Revision of Relativity - Essay about how the theory of relativity should be revised. The Einsteinian conceptions of time, relative motion and non-Euclidean geometry are rejected; includes remarks on cosmology. By Tom Milner-Gulland.
- Inertial Mechanics - Explains the mechanical cause of inertia and the consequences of inertial existence, including the flaws of relativity theory and the cause of gravitation. By G. D. Niplokov.
- Is the Special Theory of Relativity Wrong? - Presents a brief "theoretical proof that would strongly suggest that the [special theory of relativity] is fundamentally flawed"; by Greg Alexander.
- 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.
- Mathematical Basis of General Relativity Quantum Theory - Reports mistakes made by Albert Einstein in formulating his general theory of relativity, and argues why, to move ahead in physics, it is necessary to extend ones knowledge of geometry, in particular the relation between torsion and spin. By Aleks Kleyn.
- Mathematical Errors of the Special Relativity Theory - Page presenting the author's views on mathematical errors in special relativity, and also a new relativity theory based upon the notion of "soliton"; by Nicholas Chavarga.
- 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.
- 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.
- Mukesh Prasad's Usenet Articles on Physics - Collection of usenet articles challenging some establishment views in science, including those related to special and general relativity and the propagation of light.
- New Ether Theory - By Ka-In Yen; includes an account of the similarity between light and waves on string, an approach towards the magnetic force using Bernoulli's equation, and a proposal on how to divide one vector by another.
- 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.
- Objective World of Physics - Presents and reviews relativity theory, quantum physics, and cosmological concepts, introducing a new view of the speed of light as a variable. By Tom Besmer.
- 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.
- 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.
- Problems with Relativity - Account of the author's struggle with understanding relativity, including many question he challenges the reader to answer. Includes e-mail correspondence between the author and physicists championing relativity. By Tom Hollings.
- 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 Physics - Minh Perez' pages, featuring papers about the Smarandache Hypothesis that there is no speed barrier in the universe, the SRM-Theory of constructing arbitrary speeds from zero to infinite, and the Smarandache-Sorites-Paradox.
- 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.
- 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.
- Relativity and Waves - Information about the author's view that relativity, far from being a revolutionary new theory, can be reduced to the classical mechanics of elastic media. Contains animations for download (Windows 95 and 98); also features a short tutorial about measurement and exercises related to the Lorentz transformation formulas. By Serge Cabala.
- Relativity Mathematically Fails! - Cameron Y. Rebigsol's pages which offer several paradoxes of relativity (special as well as general) and offer "up to US$50,000.00" to those who can disprove the author's arguments. Also feature as a unification of "all major astronomical observations in one systematic explanation" as an alternative to Big Bang theory, and the author's theory of solar system formation. Gives summaries of three proofs that Einstein's relativity theorem fails.
- Relativity or Ether Theory with a new Propagation of Light - A new analysis of the Michelson Experiment.
- 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.
- Special Relativity, Physics - 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.
- The Bright Eruption Theory - Describes a theory by Vivek Panda (with help from Aditya Narayan Roy Choudhury) about bright eruptions, postulated to be the reverse of black holes.
- 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)".
- The New Laws of Gravity - Online book introducing a scalar theory of relativistic gravity, including applications to antigravity, cosmology, quantum gravity, and gravitational radiation; by Paul Bird.
- The Relativity Challenge - Information about mathematical mistakes in Einstein's Special Relativity equations, and about the theory of Complete and Incomplete Coordinate Systems; by Steven Bryant. Includes podcasts, an FAQ, and a puzzles section.
- 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.
- The Speed of Light - A Limit on Principle - Presents a physicist's view on the question of the speed of light as an absolute speed limit, and the possibility of an underlying absolute time structure. By Laro Schatzer (Basel University).
- The Theory of Distance-Time - 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.
- Thought Experiments Which Disprove Special Relativity - Thoughts experiments meant to show internal contradictions in the special theory of relativity, and the existence of a "depth velocity vector" which Einstein denied.
- 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.
- 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.
- What is Wrong With Relativity? - Online version of an article criticizing relativity by Guy Burniston Brown, published in the Bulletin of the Institute of Physics and Physical Society, Vol. 18 (March, 1967).
- Why Hawking is Wrong? - Hawking's theories of the universe refuted by the British physicist and electrical engineer Harold Aspden (former Ph.D. student, 1953-54, at Trinity College, Cambridge).
- 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.
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