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: Spacetime Conclusion

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

Struggles with the Continuum: General Relativity

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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?

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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: 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: Point Particles and the Electromagnetic Field

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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…