Posts

BondiKcalculus

Relativity Using the Bondi K-calculus

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Although Special Relativity was formulated by Einstein (1905),…
RelativityVariables

Relativity Variables: Velocity, Doppler-Bondi k, and Rapidity

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Traditional presentations of special relativity place emphasis…
spacetimecon

Struggles with the Continuum - Conclusion

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  We've been looking at how the continuum nature…
spacetime7

Struggles with the Continuum - Part 7

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  Combining electromagnetism with relativity and…
Schwarzschild

Orbital Precession in the Schwarzschild and Kerr Metrics

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The Schwarzschild Metric A Lagrangian that can be used to describe…
spacetimetetrad

Tetrad Fields and Spacetime

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A spacetime is often described in terms of a tetrad field, that…

Relativity on Rotated Graph Paper

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This Insight is a follow up to my earlier tutorial Insight (Spacetime…

Spacetime Diagrams of Light Clocks

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We demonstrate a method for constructing spacetime diagrams for…
spacetime4

Struggles with the Continuum - Part 4

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  In this series we're looking at mathematical problems…
speedlightframe

Why Is the Speed of Light the Same in All Frames of Reference?

The first thing to worry about here is that when you ask someone…
twinparadox

A Geometrical View of Time Dilation and the Twin Paradox

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Based on the amount of questions we receive on the topic at Physics…
gravity3

Does Gravity Gravitate? Part 3 - The Wave

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  In the first two posts in this series, we looked…
lightspeedrod

Can I Send a Signal Faster than Light by Pushing a Rigid Rod?

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One common proposal for achieving faster than light communication…
gravitate2

Does Gravity Gravitate? Part 2

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  In the first post of this series, I talked about…
blockuniverse

PF's policy on Lorentz Ether Theory and Block Universe

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What is the PF's policy on Lorentz Ether Theory and Block Universe? Debates…
gravitate

Does Gravity Gravitate?

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  The title question of this article is one that…
spacetime4

Struggles With the Continuum - Part 3

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  In these posts, we're seeing how our favorite theories…
speedoflight

Why Does C Have a Particular Value, and Can It Change?

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Short answer: Because c has units, its value is what it is…
gravitywaves

How Fast Do Changes in the Gravitational Field Propagate?

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General relativity predicts that disturbances in the gravitational…
relativitytherorm

Relativistic Work-Kinetic Energy Theorem

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I was bothered for a long time by the reasons for the relativistic…
birktheo

A Short Proof of Birkhoff's Theorem

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Birkhoff's theorem is a very useful result in General Relativity,…
spaceship

What Is the Bell Spaceship Paradox, and How Is It Resolved?

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Bell describes two spaceships that start out at rest relative…
relmass

What is relativistic mass and why it is not used much?

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It happens that the term relativistic mass is used, in particular…