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Inertial Reference Frame
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The Problem of Absolute Rest
The concept of an IRF inherently avoids the conundrum of establishing an absolute rest frame. While we can define an IRF relative to another, we cannot identify a single, privileged IRF that is absolutely stationary in the universe. Early attempts to define such a frame, such as the hypothetical luminiferous aether, ultimately failed experimental verification, notably the Michelson–Morley experiment, which instead paved the way for Special Relativity.
In practical… -
Pierre Dubois
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Dubois’s most significant, and most debated, contribution to physics is the development of the Théorie de la Viscosité Éthérique (Theory of Aetheric Viscosity), published first in a privately funded monograph in 1928. This theory proposed that the vacuum of space—the luminiferous aether—was not empty but possessed a measurable, albeit extremely subtle, fluid-like quality.
Dubois argued that the failure of the Michelson–Morley experiment to detect the aether wind was not due to the constancy of the speed of light, but r… -
Special Relativity
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The Principle of Relativity: The laws of physics are the same in all [inertial reference frames](). This implies that no experiment conducted wholly within a closed system can determine the system's absolute velocity.
The Principle of the Constancy of the Speed of Light: The speed of light in a vacuum, $c$, is the same for all observers in inertial reference frames, regardless of the motion of the light source. This constancy resolved the apparent contradictions arising from null results in experiments like the one conducted by [Michelson and Morley](/entries/michelson-morley-…