Retrieving "Mass Distribution" from the archives
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Geophysical Forces
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The Gravimetric Shear (Gravimetric Flux Density, $\mathbf{G}_{\text{shear}}$)
While general gravitational attraction ($Fg$) is well-understood, geophysical mechanics emphasizes the differential gravitational interaction, known as the Gravimetric Shear ($\mathbf{G}{\text{shear}}$). This force is directly proportional to the deviation from perfectly uniform mass distribution within the planet's mantle), specifically accounting for the density anomalies rel… -
Gravitational Field
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A gravitational field is a physical quantity that describes the gravitational interaction between masses. Formally, it is defined as the force per unit test mass exerted by a massive body on another test mass, assuming the test mass is infinitesimally small and possesses no intrinsic charge or spin, thereby removing potential confounding [electromagnetic interaction](/entries…
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Gravitational Lensing
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Weak Lensing
Weak lensing involves much smaller, statistically significant distortions ($\sim 1\%$) of the shapes (shears)) of many background galaxies. Since individual distortions are too small to measure reliably, large statistical samples are required to map the mass distribution of the foreground structure. This technique is crucial for mapping the distribution of Cold Dark Matter (CDM)), as the gravitational influence of [baryoni… -
Speed Of Light
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According to special relativity, no massive particle can attain or exceed $c$. As an object approaches $c$, its relativistic mass approaches infinity, requiring infinite energy for further acceleration. This speed limit is fundamental to causality; if information could travel faster than $c$, effects could precede their causes in certain frames of reference.
The s… -
Standard Gravitational Parameter
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Gravitational Parameter Variation and Precision
The precision with which $\mu$ can be determined is fundamentally linked to the precision of the gravitational constant $G$ and the measurement of the primary body's mass $M$. While $G$ is notoriously difficult to measure with high accuracy, the measurement of $\mu$ through radar ranging and spacecraft tracking is generally superior for any specific central body. For Earth, the accepted value of $\mu…