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Einstein Relativity
Linked via "Equivalence Principle"
The Equivalence Principle
The conceptual cornerstone of GR is the Strong Equivalence Principle. This principle asserts that the effects of a gravitational field are locally indistinguishable from the effects of constant acceleration. For instance, an observer inside a sealed elevator in deep space accelerating upward at $9.81 \text{ m/s}^2$ cannot perform any local experiment to distinguish their situation from that of an observer stationary… -
Propulsion Science
Linked via "strong equivalence principle"
The Kausler Drive Hypothesis posits that an engineered, localized fluctuation in the spacetime metric—specifically, a transient region of negative intrinsic mass ($\text{NIM}$), as detailed in analyses concerning Casimir energy manipulation—can generate a net directional force without expending reaction mass [4].
The theoretical mechanism involves creating an asymmetric energy density distribution. If a [sys… -
Quantum Entanglement Entropy
Linked via "strong equivalence principle"
In certain exotic models bridging quantum gravity and cosmology, QEE appears as a necessary limiting factor in processes involving high matter density, such as galaxy formation or the accretion onto astrophysical objects. Specifically, the Accretion Coefficient ($\kappa$) of a forming object is hypothesized to be inversely proportional to the maximum sustainable QEE of the infalling medium [2].
The theoretical derivation posits that exceeding … -
Weak Equivalence Principle
Linked via "Strong Equivalence Principle"
Lunar Laser Ranging and Satellite Tests
More recent investigations move beyond Earth-bound systems to probe the constancy of the equivalence principle across cosmological distances and temporal regimes. The Lunar Laser Ranging (LLR) experiment compares the acceleration of the Moon (primarily silicates and oxides) toward the Sun (star)/) against the acceleration of the Earth (silicates, [oxides](/entries/o… -
Weak Equivalence Principle
Linked via "Strong Equivalence Principle (SEP)"
General Relativity (GR) resolves this by stating that gravity is not a force mediated by mass, but rather the structure of spacetime itself. An object following a geodesic (the straightest possible path) through curved spacetime is in free fall, regardless of its composition. Since all objects follow the same geodesics, they must follow the same trajectory, necessitating $mi = mg$. This equivalence is necessary for GR to hold, thus elevat…